Tamilnadu Board Biology Question papers for 12th Standard (English Medium) Question paper & Study Materials

12th Zoology - Evolution Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Taking the example of Peppered moth, explain the action of natural selection. What do you call the above phenomenon?

  • 2)

    Darwin's finches and Australian marsupials are suitable examples of adaptive radiation – Justify the statement

  • 3)

    Who disproved Lamarck’s Theory of acquired characters? How?

  • 4)

    How does Mutation theory of De Vries differ from Lamarck and Darwin’s view in the origin of new species.

  • 5)

    Explain stabilizing, directional and disruptive selection with examples

12th Zoology - Immunology Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Differentiate between:
    Innate immunity and acquired immunity

  • 2)

    Differentiate between:
    Primary and secondary immune responses

  • 3)

    Differentiate between:
    Active and passive immunity

  • 4)

    Differentiate between:
    Humoral and CMI immunity

  • 5)

    Differentiate between:
    Autoimmune disease and Immunodeficiency disease

12th Botany - Economically Useful Plants and Entrepreneurial Botany Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Differentiate bio-medicines and botanical medicines.

  • 2)

    Write the origin and area of cultivation of green gram and red gram.

  • 3)

    What are millets? What are its types? Give example for each type.

  • 4)

    If a person drinks a cup of coffee daily it will help him for his health. Is this correct? If it is correct, list out the benefits.

  • 5)

    Enumerate the uses of turmeric

12th Botany - Plant Breeding Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    How Rhizobium acts as an efficient bio- fertiIizer?

  • 2)

    Azolla increases the yield of paddy crop - support your answer.

  • 3)

    Mention any three advantages of Arbuscular mycorrhizal association.

  • 4)

    What makes the Trichoderma an effective bio-pesticide?

  • 5)

    Write a note on Green Manuring.

12th Botany - Environmental Issues Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    How do forests help in maintaining the climate?

  • 2)

    How do sacred groves help in the conservation of biodiversity?

  • 3)

    Which one gas is most abundant out of the four commonest greenhouse gases? Discuss the effect of this gas on the growth of plants?

  • 4)

    List out the effects of global warming.

  • 5)

    Mention any three sources of carbon dioxide emission.

12th Botany - Ecosystem Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Construct the food chain with the following data.
    Hawk, plants, frog, snake, grasshopper.

  • 2)

    Name of the food chain which is generally present in all type of ecosystem. Explain and write their significance.

  • 3)

    Shape of pyramid in a particular ecosystem is always different in shape. Explain with example.

  • 4)

    Generally human activities are against to the ecosystem, where as you a student how will you help to protect ecosystem?

  • 5)

    Explain Grazing food chain with example.

12th Botany - Principles of Ecology Three Marks Quesions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Lichen is considered as a good example of obligate mutualism. Explain.

  • 2)

    What is mutualism? Mention any two example where the organisms involved are commercially exploited in modern agriculture.

  • 3)

    List any two adaptive features evolved in parasites enabling them to live successfully on their host?

  • 4)

    Mention any two significant roles of predation plays in nature.

  • 5)

    How does an orchid ophrys ensures its pollination by bees ?

12th Botany - Plant Tissue Culture Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Give the examples for micro propagation performed plants .

  • 2)

    Explain the basic concepts involved in plant tissue culture

  • 3)

    Based on the material used, how will you classify the culture technology? Explain it.

  • 4)

    Mention any three macronutrients and micro nutrients used in MS medium.

  • 5)

    What are the optimal conditions that favours the induction of callus from nutrient medium?

12th Botany - Principles and Processes of Biotechnology Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What do you know about the word pBR332?

  • 2)

    Mention the application of Biotechnology.

  • 3)

    What are restriction enzyme. Mention their type with role in Biotechnology.

  • 4)

    Is their any possibilities to transfer a suitable desirable gene to host plant without vector? Justify your answer.

  • 5)

    How will you identify a vectors?

12th Zoology - Human Health and Diseases Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Explain the structure of immunoglobulin with suitable diagram.

  • 2)

    What are the cells involved innate immune system.

  • 3)

    What is vaccine? What are its types?

  • 4)

    A person is infected by HIV. How will you diagnose for AIDS?

  • 5)

    Autoimmunity is a misdirected immune response. Justify.

12th Zoology - Microbes in Human Welfare Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Explain the role of cry-genes in genetically modified crops.

  • 2)

    Write the key features of organic farming.

  • 3)

    Justify the role of microbes as a bio-fertilizer

  • 4)

    What is 'activated sludge' in sewage treatment?

  • 5)

    UV is an ideal disinfectant for waste water. Give Reason

12th Zoology - Applications of Biotechnology Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What are transgenic animals? Give examples

  • 2)

    If a person thinks he is infected with HIV, due to unprotected sex, and goes for a blood test. Do you think a test such as ELISA will help? If so why? If not, why?

  • 3)

    Explain how ADA deficiency can be corrected

  • 4)

    What are DNA vaccines?

  • 5)

    Differentiate between Somatic cell gene therapy and germline gene therapy

12th Zoology - Organisms and Population Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Give the diagnostic characters features of a Biome

  • 2)

    Classify the aquatic biomes of Earth.

  • 3)

    What are the ways by which organisms respond to abiotic factors?

  • 4)

    Classify the adaptive traits found in organisms

  • 5)

    Differentiate Natality and Mortality

12th Zoology - Biodiversity and its Conservation Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Extinction of a keystone species led to loss of biodiversity – Justify.

  • 2)

    Compare and Contrast the insitu and exsitu conservation.

  • 3)

    What are called endangered species? Explain with examples

  • 4)

    Why do we find a decrease in biodiversity distribution, if we move from the tropics towards the poles?

  • 5)

    What are the factors that drive habitat loss?

12th Zoology - Environmental Issues Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What effect can fertilizer runoff have on an aquatic ecosystem?

  • 2)

    How can we control eutrophication?

  • 3)

    Why does ozone hole form over Antarctica?

  • 4)

    Mention the causes of enhanced use of ultraviolet radiation

  • 5)

    Discuss the role of women in protection and conservation of forests.

12th Botany - Asexual and Sexual Reproduction in Plants Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Discuss the importance of Modern methods in reproduction of plants.

  • 2)

    What is Cantharophily.

  • 3)

    List any two strategy adopted by bisexual flowers to prevent self-pollination.

  • 4)

    What is endothelium

  • 5)

    “The endosperm of angiosperm is different from gymnosperm”. Do you agree. Justify your answer.

12th Botany - Classical Genetics Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What are multiple alleles?

  • 2)

    What are the reasons for Mendel’s successes in his breeding experiment?

  • 3)

    Explain the law of dominance in monohybrid cross.

  • 4)

    Differentiate incomplete dominance and codominance.

  • 5)

    What is meant by cytoplasmic inheritance

12th Botany - Chromosomal Basis of Inheritance Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)


    From the above figure identify the type of mutation and explain it.

  • 2)

    Write the salient features of Sutton and Boveri concept.

  • 3)

    Explain the mechanism of crossing over.

  • 4)

    Write the steps involved in molecular mechanism of DNA recombination with diagram.

  • 5)

    Point out any three salient features of chromosomal theory of inheritance.

12th Standard Biology - Zoology - Evolution Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    The first life on earth originated

  • 2)

    The phenomenon of “ Industrial Melanism” demonstrates

  • 3)

    Who proposed the Germplasm theory?

  • 4)

    Fossils are generally found in

  • 5)

    The golden age of reptiles was

12th Standard Biology - Zoology - Molecular Genetics Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    Hershey and Chase experiment with bacteriophage showed that

  • 2)

    What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?

  • 3)

    The first codon to be deciphered was __________ which codes for ________.

  • 4)

    When lactose is present in the culture medium:

  • 5)

    One gene one enzyme hypothesis was proposed by Beadle and Tatum based on ________

12th Standard Biology - Zoology - Principles of Inheritance and Variation Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    Haemophilia is more common in males because it is a

  • 2)

    Three children of a family have blood groups A, AB and B. What could be the genotypes of their parents?

  • 3)

    Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

  • 4)

    What can be the blood group of offspring when both parents have AB blood group?

  • 5)

    XO type of sex determination and XY type of sex determination are examples of

JUNE MONTHLY TEST - 2019 - by KRP Matriculation Hr Sec School View & Read

  • 1)

    Match the following
    I) External fertilization i) pollen grain
    II) Androecium ii)anther wall
    III) Male gametophyte iii)algae
    IV) Primary parietal layer iv)stamens

  • 2)

    Identify the incorrect pair

  • 3)

    Assertion : Sporopollenin preserves pollen in fossil deposits
    Reason : Sporopollenin is resistant to physical and biological decomposition

  • 4)

    Consider the following statement(s)
    i) In Protandrous flowers pistil matures earlier
    ii) In Protogynous flowers pistil matures earlier
    iii) Herkogamy is noticed in unisexual flowers
    iv) Distyly is present in Primula

  • 5)

    In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

12th Biology - Zoology - Reproductive Health Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

  • 2)

    The approach which does not give the defined action of contraceptive is

  • 3)

    Read the given statements and select the correct option
    and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
    Statement 2: They are chemical barriers of conception and are reusable.

  • 4)

    Select the incorrect action of hormonal contraceptive pills from the following

  • 5)

    In the year ______    india is expected to become the largest country in population size ______

12th Zoology - Molecular Genetics Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Distinguish between structural gene, regulatory gene and operator gene

  • 2)

    A low level of expression of lac operon occurs at all the windows for treatment of various genetic disorders. Justify the statement

  • 3)

    Why the human genome project is called a mega project?

  • 4)

    From their examination of the structure of DNA, What did Watson and Crick infer about the probable mechanism of DNA replication, coding capability and mutation?

  • 5)

    Why tRNA is called an adapter molecule?

12th Zoology - Principles of Inheritance and Variation Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Differentiate Intersexes from Supersexes

  • 2)

    Explain the genetic basis of ABO blood grouping man.

  • 3)

    How is sex determined in human beings?

  • 4)

    Explain male heterogamety

  • 5)

    Give an account of genetic control of Rh factor.

12th Standard Zoology - Reproductive Health 3 Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Expand the following
    a) ZIFT
    b) ICSI

  • 2)

    What are the strategies to be implemented in India to attain total reproductive health?

  • 3)

    Differentiate foeticide and infanticide

  • 4)

    Describe the major STDs and their symptoms.

  • 5)

    What is GIFT?

12th Standard Zoology - Human Reproduction 3 Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is inhibin? State its functions

  • 2)

    Mention the importance of the position of the testes in humans.

  • 3)

    What is the composition of semen?

  • 4)

    Name the hormones produced from the placenta during pregnancy.

  • 5)

    Define gametogenesis.

12th Zoology - Reproduction in Organisms Three Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The unicellular organisms which reproduce by binary fission are considered immortal. Justify

  • 2)

    Why is the offspring formed by asexual reproduction referred as a clone?

  • 3)

    Why are the offsprings of oviparous animal at a greater risk as compared to offsprings of viviparous organisms?

  • 4)

    Give reasons for the following:
    (a) Some organisms like honey bees are called parthenogenetic animals
    (b) A male honey bee has 16 chromosomes where as its female has 32 chromosomes

  • 5)


    (i) Identify the Process
    (ii) Name the Organism

12th Botany - Asexual and Sexual Reproduction in Plants Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Mention the contribution of Hofmeister towards Embryology.

  • 2)

    What is layering?

  • 3)

    Distinguish mound layering and air layering.

  • 4)

    Explain the conventional methods adopted in vegetative propagation of higher plants.

  • 5)

    What are diaspores?

12th Botany - Classical Genetics Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Name the seven contrasting traits of Mendel.

  • 2)

    What is meant by true breeding or pure breeding lines / strain?

  • 3)

    Give the names of the scientists who rediscovered Mendelism

  • 4)

    What is back cross?

  • 5)

    Define Genetics.

12th Botany - Chromosomal Basis of Inheritance Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    When two different genes came from same parent they tend to remain together.
    i) What is the name of this phenomenon?
    ii) Draw the cross with suitable example.
    iii) Write the observed phenotypic ratio.

  • 2)

    If you cross dominant genotype PV/PV male Drosophila with double recessive female and obtain F1 hybrid. Now you cross F1 male with double recessive female.
    i) What type of linkage is seen?
    ii) Draw the cross with correct genotype.
    iii) What is the possible genotype in F2 generation?

  • 3)
    s.no gamete types Number of progenies
    1 ABC 349
    2 Abc 114
    3 abC 124
    4 AbC 5
    5 aBc 4
    6 aBC 116
    7 ABc 128
    8 abc 360

    i) What is the name of this test cross?
    ii) How will you construct gene mapping from the above given data?
    iii) Find out the correct order of genes.

  • 4)

    What is the difference between missense and nonsense mutation?

  • 5)

    What does the condition synteny refers to?

12th Botany - Principles and Processes of Biotechnology Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    How do you use the biotechnology in modern practice?

  • 2)

    What are the materials used to grow microorganism like Spirulina?

  • 3)

    You are working in a biotechnology lab with a becterium namely E.coli. How will you cut the nucleotide sequence? explain it.

  • 4)

    What are the enzymes you can used to cut terminal end and internal phospho di ester bond of nucleotide sequence?

  • 5)

    Name the chemicals used in gene transfer.

12th Standard Botany - Plant Tissue Culture Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is the name of the process given below? Write its 4 types.

  • 2)

    How will you avoid the growing of microbes in nutrient medium during culture process? What are the techniques used to remove the microbes?

  • 3)

    Write the various steps involved in cell suspension culture.

  • 4)

    What do you mean Embryoids? Write its application.

  • 5)

    Define sterilization.

12th Standard Botany - Principles of Ecology Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is ecological hierarchy? Name the levels of ecological hierarchy.

  • 2)

    What are ecological equivalents? Give one example

  • 3)

    ‘Green algae are not likely to be found in the deepest strata of the ocean’. Give at least one reason.

  • 4)

    What is Albedo effect and write their effects?

  • 5)

    The organic horizon is generally absent from agricultural soils because tilling, e.g., plowing, buries organic matter. Why is an organic horizon generally absent in desert soils ?

Class 12th Botany - Ecosystem Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Productivity of profundal zone will be low. Why?

  • 2)

    Discuss the gross primary productivity is more efficient than net primary productivity.

  • 3)

    Pyramid of energy is always upright. Give reasons

  • 4)

    What will happen if all producers are removed from ecosystem?

  • 5)

    Mention any two climatic factors and edaphic factors of an ecosystem.

Class 12th Botany - Environmental Issues Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is ozone hole?

  • 2)

    Give four examples of plants cultivated in commercial agroforestry.

  • 3)

    Expand CCS.

  • 4)

    Methane is one of a potent green house gas. Point out a few sources from where methane is generated.

  • 5)

    What is Dobson unit?

Class 12th Botany - Plant Breeding Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Differentiate primary introduction from secondary introduction.

  • 2)

    How are microbial innoculants used to increase the soil fertility?

  • 3)

    What are bio-pesticides? Why they are considered better than synthetic pesticides?

  • 4)

    Define acclimatization.

  • 5)

    Who coined the term "pureline"? Define it.

12th Standard Botany - Economically Useful Plants and Entrepreneurial Botany Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Write the cosmetic uses of Aloe.

  • 2)

    What is pseudo cereal? Give an example.

  • 3)

    Discuss which wood is better for making furniture.

  • 4)

    A person got irritation while applying chemical dye. What would be your suggestion for alternative?

  • 5)

    Name the humors that are responsible for the health of human beings.

12th Standard Zoology - Immunology Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    How does immune system work?

  • 2)

    What are interferons? Mention their role.

  • 3)

    List out chemical alarm signals produced during inflammation.

  • 4)

    Define acquired immunity.

  • 5)

    What is MALT and BALT?

12th Standard Zoology - Environmental Issues Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Expand
    (i) CFC
    (ii) AQI
    (iii) PAN

  • 2)

    What is SMOG and how it is harmful for us?

  • 3)

    List all the wastes that you generate, at home, school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?

  • 4)

    Discuss the causes and effects of global warming. What measures need to be taken to control global warming?

  • 5)

    What would Earth be like without the greenhouse effect?

12th Standard Zoology - Organisms and Population Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Define ecological niche.

  • 2)

    What is Zero Stress?

  • 3)

    What is soil permeability?

  • 4)

    State Allen's rule.

  • 5)

    Mention the important behavioural adaptations seen is animals

12th Standard Zoology - Biodiversity and its Conservation Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Define endemism

  • 2)

    How many hotspots are there in India? Name them

  • 3)

    What are the three levels of biodiversity?

  • 4)

    Name the active chemical found in the medicinal plant Rauwolfia vomitoria. What type of diversity it belongs to?

  • 5)

    “Amazon forest is considered to be the lungs of the planet”- Justify this statement.

12th Standard Zoology - Applications of Biotechnology Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Mention the number of primers required in each cycle of PCR. Write the role of primers and DNA polymerase in PCR. Name the source organism of the DNA polymerase used in PCR.

  • 2)

    How is the amplification of a gene sample of interest carried out using PCR?

  • 3)

    What is genetically engineered Insulin?

  • 4)

    Explain how “Rosie” is different from a normal cow

  • 5)

    How was Insulin obtained before the advent of rDNA technology? What were the problems encountered?

12th Standard Zoology - Microbes in Human Welfare Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    How is milk converted into curd? Explain the process of curd formation

  • 2)

    Give any two bioactive molecules produced by microbes and state their uses.

  • 3)

    What is biological oxygen demand?

  • 4)

    What is antibiotic resistance?

  • 5)

    What is superbugt?

12th Standard Biology - Zoology - Human Reproduction Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    The mature sperms are stored in the

  • 2)

    The male homologue of the female clitoris is

  • 3)

    The most important hormone in intiating and maintaining lactation after birth is

  • 4)

    Colostrum is rich in

  • 5)

    _____ are endocrine cells.

12th Standard Biology - Zoology - Reproduction in Organisms Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    Animals giving birth to young ones:

  • 3)

    In which mode of reproduction variations are seen

  • 4)

    If the entire organism behaves as a gamete the Phenomenon is called _____

  • 5)

    ______ is a seasonal breeder.

12th Biology Quarterly Exam Question Paper 2019 - by Suchitra - Gobichettipalayam View & Read

12th Biology - Term 1 Model Question Paper - by Antoney - Tiruppur View & Read

  • 1)

    Animals giving birth to young ones:

  • 2)

    The most important hormone in intiating and maintaining lactation after birth is

  • 3)

    Select the incorrect action of hormonal contraceptive pills from the following

  • 4)

    Mangolism is a genetic disorder which is caused by the presence of an extra chromosome number

  • 5)

    The total number of nitrogenous bases in human genome is estimated to be about

12th Zoology - Human Health and Diseases Two Marks Question - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Given below are some human organs. Identify one primary and one secondary lymphoid organ. Explain its role. Liver, thymus, stomach, thyroid, tonsils.

  • 2)

    What are interferons? Mention their role.

  • 3)

    List out chemical alarm signals produced during inflammation.

  • 4)

    Explain the process of replication of retrovirus after it gains entry into the human body.

  • 5)

    Name the causal agent of African sleeping sickness and the vector.

12th Standard Zoology - Evolution Two Marks Question - by Suchitra - Gobichettipalayam View & Read

  • 1)

    List out the major gases seems to be found in the primitive earth.

  • 2)

    Explain the three major categories in which fossilization occur?

  • 3)

    Explain how mutations, natural selection and genetic drift affect Hardy Weinberg equilibrium.

  • 4)

    How did Darwin explain fitness of organisms?

  • 5)

    Mention the main objections to Darwinism.

12th Standard Zoology - Molecular Genetics Two Marks Question - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Give reasons: Genetic code is ‘universal’.

  • 2)

    Name the parts marked ‘A’ and ‘B’ in the given transcription unit:

  • 3)

    Mention any two ways in which single nucleotide polymorphism (SNPs) identified in human genome can bring revolutionary change in biological and medical science

  • 4)

    State any three goals of the human genome project.

  • 5)

    Why is the term nucleic acid used for DNA and RNA?

12th Zoology - Principles of Inheritance and Variation Two Marks Question - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is haplodiploidy?

  • 2)

    What is Lyonisation?

  • 3)

    What is criss-cross inheritance?

  • 4)

    Why are sex linked recessive characters more common in the male human beings?

  • 5)

    What are holandric genes?

12th Zoology - Reproductive Health Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is amniocentesis? Why a statutory ban is imposed on this technique?

  • 2)

    Select the correct term from the bracket and complete the given branching tree

    (Barriers, Lactational amenorrhoea, CuT, Tubectomy)

  • 3)

    Correct the following statements
    a) Transfer of an ovum collected from donor into the fallopian tube is called ZIFT.
    b) Transfering of an embryo with more than 8 blastomeres into uterus is called GIFT.
    c) Multiload 375 is a hormone releasing IUD.

  • 4)

    Which method do you suggest the couple to have a baby, if the male partner fails to inseminate the female or due to very low sperm count in the ejaculate?

  • 5)

    Which type of women are benefited by Invitro fertilization?

12th Zoology - Human Reproduction Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Mention the differences between spermiogenesis and spermatogenesis

  • 2)

    Expand the acronyms
    a. FSH
    b. LH
    c. hCG
    d. hPL

  • 3)

    How is polyspermy avoided in humans?

  • 4)

    What is colostrum? Write its significance.

  • 5)

    Draw a labeled sketch of a spermatozoan.

12th Zoology - Reproduction in Organisms Two Marks Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Name an organism where cell division is itself a mode of reproduction.

  • 2)

    Name the phenomenon where the female gamete directly develops into a new organism with with an avian example

  • 3)

    What is parthenogenesis? Give two examples from animals.

  • 4)

    Which type of reproduction is effective -Asexual or sexual and why?

  • 5)

    What is plasmotomy?

12th Biology - Term 1 Five Mark Model Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    What is the difference between syngamy and fertilization?

  • 2)

    Identify the given image and label its parts marked as a, b, c and d

  • 3)

    Write the preventive measures of STDs.

  • 4)

    Explain the inheritance of sex linked characters in human being.

  • 5)

    List the common withdrawal symptoms of drugs and alcohol abuse.

12th Biology Quarterly Model Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    During favourable conditions ______ shows multiple fission.

  • 3)

    The foetal membrane that forms the basis of the umbilical cord is

  • 4)

    A contraceptive pill prevents ovulation by

  • 5)

    Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

12th Zoology - Immunology Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    AIDS virus has

  • 2)

    All are peripheral lymphoid organs except

  • 3)

    In agglutination and precipitation reactions, the antigen is a ______ and ______ respectively

  • 4)

    B cells that produce and release large amounts of antibody are called

  • 5)

    Raja is injured and got swelling. The swelling is due to the infection of tissue is an example of

12th Botany - Economically Useful Plants and Entrepreneurial Botany Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Consider the following statements and choose the right option.
    i) Cereals are members of grass family.
    ii) Most of the food grains come from monocotyledon.

  • 2)

    Tamarindus indica is indigenous to

  • 3)

    New world species of cotton

  • 4)

    Observe the following statements and pick out the right option from the following:
    Statement I – Perfumes are manufactured from essential oils.
    Statement II – Essential oils are formed at different parts of the plants.

  • 5)

    Which one of the following matches is correct?

12th Standard Botany - Ecosystem Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Profundal zone is predominated by heterotrophs in a pond ecosystem, because of

  • 2)

    Solar energy used by green plants for photosynthesis is only

  • 3)

    Which of the following ecosystem has the highest primary productivity?

  • 4)

    Which one is in descending order of a food chain

  • 5)

    Significance of food web is / are

TN 12th Standard Biology Official Model Question Paper 2019 - 2020 - by Suchitra - Gobichettipalayam View & Read

12th Botany - Plant Breeding Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Pick out the odd pair

  • 2)

    Match Column I with Column II
    Column I Column II
    i) William S. Gaud I) Heterosis
    ii) Shull II) Mutation breeding
    iii) Cotton Mather III) Green revolution
    iv) Muller and Stadler IV) Natural hybridization

  • 3)

    The quickest method of plant breeding is

  • 4)

    Desired improved variety of economically useful crops are raised by

  • 5)

    Plants having similar genotypes produced by plant breeding are called

12th Botany - Environmental Issues Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which of the following would most likely help to slow down the greenhouse effect.

  • 2)

    Deforestation means

  • 3)

    The unit for measuring ozone thickness

  • 4)

    People’s movement for the protection of environment in Sirsi of Karnataka is

  • 5)

    The plants which are grown in silivpasture system are

12th Standard Botany - Principles of Ecology Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In soil water available for plants is

  • 2)

    Read the following statements and fill up the blanks with correct option.
    i) Total soil water content in soil is called _________________
    ii) Soil water not available to plants is called _________________
    iii) Soil water available to plants is called

  • 3)

    Pedogenesis refers to

  • 4)

    Mycorrhiza promotes plant growth by

  • 5)

    In a fresh water environment like pond, rooted autotrophs are

Botany - Plant Breeding Zoology - Environmental Issues Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Right to Clean Water is a fundamental right, under the Indian Constitution

  • 2)

    As per 2017 statistics, the highest per capita emitter of Carbon dioxide in the world is

  • 3)

    The use of microorganism metabolism to remove pollutants such as oil spills in the water bodies is known as

  • 4)

    The Ozone Day is observed every year on September 16 as on this day in 1987 the ___________was signed for launching efforts to arrest the depletion of the fragile ozone layer in the stratosphere that prevents the harmful ultra-violet rays of the sun from reaching the earth. Fill the correct word in blank.

  • 5)

    Which among the following always decreases in a Food chain across tropic levels?

12th Zoology - Biodiversity and its Conservation Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which of the following region has maximum biodiversity

  • 2)

    The organization which published the red list of species is

  • 3)

    Who introduced the term biodiversity?

  • 4)

    Which of the following forests is known as the lungs of the planet earth?

  • 5)

    Which one of the following are at high risk extinction due to habitat destruction

12th Standard Zoology - Organisms and Population Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    All populations in a given physical area are defined as

  • 2)

    Organisms which can survive a wide range of temperatuer are called

  • 3)

    Which of the following is an r-species

  • 4)

    The relationship between sucker fish and shark is__________

  • 5)

    Animals that can move from fresh water to sea called as______

12th Zoology - Applications of Biotechnology Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Dolly, the sheep was obtained by a technique known as

  • 2)

    How many amino acids are arranged in the two chains of Insulin

  • 3)

    PCR proceeds in three distinct steps governed by temperature, they are in order of

  • 4)

    ELISA is mainly used for

  • 5)

    Recombinant Factor VIII is produced in the ______ cells of the Chinese Hamster

12th Standard Zoology - Microbes in Human Welfare Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Cyclosporin – A is an immunosuppressive drug produced from _______

  • 2)

    Which of the following bacteria is used extensively as a bio-pesticide?

  • 3)

    Which of the following is not involved in nitrogen fixation?

  • 4)

    The purpose of biological treatment of waste water is to _______

  • 5)

    The gases produced in anaerobic sludge digesters are

12th Zoology - Human Health and Diseases Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    A 30 year old woman has bleedy diarrhoea for the past 14 hours, which one of the following organisms is likely to cause this illness?

  • 2)

    Cirrhosis of liver is caused by chronic intake of ______

  • 3)

    The sporozoite of the malarial parasite is present in ______

  • 4)

    Spread of cancerous cells to distant sites is termed as

  • 5)

    AIDS virus has

12th Standard Zoology - Evolution Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The first life on earth originated

  • 2)

    Which of the following was the contribution of Hugo de Vries?

  • 3)

    Fossils are generally found in

  • 4)

    Which period was called “Age of fishes”?

  • 5)

    The Neanderthal man had the brain capacity of

12th Botany - Plant Tissue Culture Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The time duration for sterilization process by using autoclave is ______ minutes and the temperature is _______

  • 2)

    Which of the following statement is correct

  • 3)

    The prevention of large scale loss of biological interity

  • 4)

    Cryopreservation means it is a process to preserve plant cells, tissues or organs

  • 5)

    Solidifying agent used in plant tissue culture is

12th Zoology - Molecular Genetics Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Hershey and Chase experiment with bacteriophage showed that

  • 2)

    What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?

  • 3)

    Which of the following is the correct sequence of event with reference to the central dogma?

  • 4)

    Which of the following statements about DNA replication is not correct?

  • 5)

    Meselson and Stahl’s experiment proved

12th Botany - Principles and Processes of Biotechnology Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Restriction enzymes are

  • 2)

    The process of recombinant DNA technology has the following steps
    I. amplication of the gene
    II. Insertion of recombinant DNA into the host cells
    III. Cutting of DNA at specific location using restriction enzyme .
    IV. Isolation of genetic material (DNA) Pick out the correct sequence of step for recombinant DNA technology.

  • 3)

    pBR 322, BR stands for

  • 4)

    Which of the following one is used as a Biosensors?

  • 5)

    Assertion : Agrobacterium tumifaciens is popular in genetic engineering because this bacteriumis associated with the root nodules of all cereals and pulse crops
    Reason: A gene incorporated in the bacterial chromosomal genome gets atomatically transferred to the cross with which bacterium is associated.

12th Standard Zoology - Principles of Inheritance and Variation Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Haemophilia is more common in males because it is a

  • 2)

    Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

  • 3)

    What can be the blood group of offspring when both parents have AB blood group?

  • 4)

    If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be

  • 5)

    XO type of sex determination and XY type of sex determination are examples of

12th Standard Botany - Chromosomal Basis of Inheritance Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    An allohexaploidy contains

  • 2)

    The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

  • 3)

    Accurate mapping of genes can be done by three point test cross because increases

  • 4)

    If haploid number in a cell is 18. The double monosomic and trisomic number will be

  • 5)

    Changing the codon AGC to AGA represents

12th Standard Zoology - Reproductive Health Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

  • 2)

    A contraceptive pill prevents ovulation by

  • 3)

    The approach which does not give the defined action of contraceptive is

  • 4)

    Read the given statements and select the correct option
    and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
    Statement 2: They are chemical barriers of conception and are reusable.

  • 5)

    Match column I with column II and select the correct option from the codes given below.

    Column I Column II
    A. Copper releasing IUD (i) LNG-20
    B. Hormone releasing (ii) Lippes loop IUD
    C. Non medicated IUD (iii) Saheli
    D. Mini pills (iv) Multiload-375

12th Standard Zoology - Human Reproduction Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The mature sperms are stored in the

  • 2)

    The glandular accessory organ which produces the largest proportion of semen is

  • 3)

    The most important hormone in intiating and maintaining lactation after birth is

  • 4)

    The process which the sperm undergoes before penetrating the ovum is

  • 5)

    The milk secreted by the mammary glands soon after child birth is called

12th Standard Botany - Classical Genetics Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Extra nuclear inheritance is a consequence of presence of genes in

  • 2)

    In Mendel’s experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

  • 3)

    Test cross involves

  • 4)

    Select the correct statement from the ones given below with respect to dihydrid cross

  • 5)

    Which Mendelian idea is depicted by a cross in which the F1 generation resembles both the parents

12th Standard Botany - Asexual and Sexual Reproduction in Plants Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Choose the correct statement from the following

  • 2)

    Identify the correctly matched pair

  • 3)

    Arrange the layers of anther wall from locus to periphery

  • 4)

    Assertion : Sporopollenin preserves pollen in fossil deposits
    Reason : Sporopollenin is resistant to physical and biological decomposition

  • 5)

    Transmitting tissue is found in

12th Standard Zoology - Reproduction in Organisms Book Back Questions - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    Animals giving birth to young ones:

  • 3)

    The mode of reproduction in bacteria is by

  • 4)

    Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Offsprings produced by asexual reproduction are genetically identical to the parent.
    Reason: Asexual reproduction involves only mitosis and no meiosis

  • 5)

    Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Viviparous animals give better protection to their off springs.
    Reason: They lay their eggs in the safe places of the environment

12th Standard Botany - Classical Genetics One Mark Question and Answer - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Extra nuclear inheritance is a consequence of presence of genes in

  • 2)

    In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype

  • 3)

    How many different kinds of gametes will be produced by a plant having the genotype AABbCC?

  • 4)

    How many characters studied by Mendel in pisum sativum

  • 5)

    Mendel's work were rediscovered by__________

12th Standard Botany - Asexual and Sexual Reproduction in Plants One Mark Question with Answer Key - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Choose the correct statement from the following

  • 2)

    An eminent Indian embryologist is

  • 3)

    Identify the correctly matched pair

  • 4)

    Name the person who discovered the pollen tube?

  • 5)

    Cleavage polyembryony is noticed in _________________

12th Zoology - Human Health and Diseases One Mark Question with Answer - by Suchitra - Gobichettipalayam View & Read

  • 1)

    A 30 year old woman has bleedy diarrhoea for the past 14 hours, which one of the following organisms is likely to cause this illness?

  • 2)

    The sporozoites of Plasmodium vivax are formed from ________

  • 3)

    Spread of cancerous cells to distant sites is termed as

  • 4)

    Choose the symptom applicable for mumps

  • 5)

    ___________is a pandemic disease

12th Zoology - Principles of Inheritance and Variation One Mark Question and Answer - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Haemophilia is more common in males because it is a

  • 2)

    Which of the following phenotypes in the progeny are possible from the parental combination AxB?

  • 3)

    Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

  • 4)

    Which of the following is true about Rh factor in the offspring of a parental combination DdXDd (both Rh positive)?

  • 5)

    The ABO blood group was discovered by ________.

12th Zoology - Molecular Genetics One Mark Question with Answer Key - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Hershey and Chase experiment with bacteriophage showed that

  • 2)

    DNA and RNA are similar with respect to

  • 3)

    What is the basis for the difference in the synthesis of the leading and lagging strand of DNA molecules?

  • 4)

    Chromosomes were first observed by ________.

  • 5)

    The term nucleic acid was coined by ________.

12th Standard Zoology - Evolution One Mark Question and Answer - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The first life on earth originated

  • 2)

    Who published the book “Origin of species by Natural Selection” in 1859?

  • 3)

    Darwin’s finches are an excellent example of

  • 4)

    The age of fossils can be determined by

  • 5)

    The term biogenesis was coined by

12th Zoology - Reproductive Health One Mark Question and Answer - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

  • 2)

    Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

  • 3)

    The approach which does not give the defined action of contraceptive is

  • 4)

    Select the incorrect action of hormonal contraceptive pills from the following

  • 5)

    Select the proper harmonal Composition of oral Contraceptive pills

12th Zoology - Human Reproduction One Mark Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The mature sperms are stored in the

  • 2)

    The male sex hormone testosterone is secreted from

  • 3)

    The site of embryo implantation is the

  • 4)

    The foetal membrane that forms the basis of the umbilical cord is

  • 5)

    The most important hormone in intiating and maintaining lactation after birth is

12th Zoology - Reproduction in Organisms One Mark Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    The mode of reproduction in bacteria is by

  • 3)

    Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Viviparous animals give better protection to their off springs.
    Reason: They lay their eggs in the safe places of the environment

  • 4)

    Transverse Binary fission is seen is ______

  • 5)

    In, dinoflagellates the types of asexual reproduction seen is _____

12th Botany - Principles and Processes of Biotechnology Model Questions Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Restriction enzymes are

  • 2)

    Plasmids are

  • 3)

    pBR 322, BR stands for

  • 4)

    Which one of the following is not correct statement

  • 5)

    An analysis of chromosomal DNA using the southern hybridisation technique does not use

12th Botany - Chromosomal Basis of Inheritance Model Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

  • 2)

    Due to incomplete linkage in maize, the ratio of parental and recombinants are

  • 3)

    Changing the codon AGC to AGA represents

  • 4)

    The following sequence represents the location of genes in a chromosome. A - B - C - M - R - S - y -Z. Which of the gene pairs will have least chance of getting inherited together?

  • 5)

    Identify the syntenic gene from the given genes sequence of a chromosome G-H-I-J-K-L-M-A-B

12th Botany - Classical Genetics Model Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Extra nuclear inheritance is a consequence of presence of genes in

  • 2)

    In order to find out the different types of gametes produced by a pea plant having the genotype AaBb, it should be crossed to a plant with the genotype

  • 3)

    The genotype of a plant showing the dominant phenotype can be determined

  • 4)

    The genes controlling the seven pea characters studied by Mendel are known to be located on how many different chromosomes?

  • 5)

    Among the following characters which one was not considered by Mendel in his experimentation pea?

12th Standard Botany - Asexual and Sexual Reproduction in Plants Important Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    An eminent Indian embryologist is

  • 2)

    Size of pollen grain in Myosotis

  • 3)

    Assertion : Sporopollenin preserves pollen in fossil deposits
    Reason : Sporopollenin is resistant to physical and biological decomposition

  • 4)

    Choose the correct statement(s) about tenuinucellate ovule

  • 5)

    Which of the following represent megagametophyte

12th Standard Zoology - Evolution Model Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The phenomenon of “ Industrial Melanism” demonstrates

  • 2)

    Who proposed the Germplasm theory?

  • 3)

    Modern man belongs to which period?

  • 4)

    The term biogenesis was coined by

  • 5)

    _____________ was not a part of theory of chemical evolution.

12th Standard Biology First Mid Term Model Questions Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    The site of embryo implantation is the

  • 3)

    Co-dominant blood group is

  • 4)

    Assertion (A): Zea mays is a monocotyledonous plant.
    Reason (R): Shield shaped cotyledon is called scutellum.

  • 5)

    Assertion (A): DMH -11 is a transgenic mustard.
    Reason (R): It is developed by using bamase/ barstar technology.

12th Standard Biology Chapter 4 Principles of Inheritance and Variation Important Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which of the following phenotypes in the progeny are possible from the parental combination AxB?

  • 2)

    Which of the following phenotypes is not possible in the progeny of the parental genotypic combination IAIO X IAIB?

  • 3)

    If the childs blood group is ‘O’ and fathers blood group is ‘A’ and mother’s blood group is ‘B’ the genotype of the parents will be

  • 4)

    The inheritance of blood group is determined by multiple alleles as discovered by _________.

  • 5)

    The__________ is called null allele.

12th Standard Zoology - Reproductive Health Important Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    Which of the following is correct regarding HIV, hepatitis B, gonorrhoea and trichomoniasis?

  • 2)

    Which one of the following groups includes sexually transmitted diseases caused by bacteria only?

  • 3)

    Read the given statements and select the correct option
    and vaults are made of rubber and are inserted into the female reproductive tract to cover the cervix before coitus.
    Statement 2: They are chemical barriers of conception and are reusable.

  • 4)

    Select the incorrect action of hormonal contraceptive pills from the following

  • 5)

    Select the proper harmonal Composition of oral Contraceptive pills

12th Standard Zoology - Human Reproduction Important Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    The site of embryo implantation is the

  • 2)

    The foetal membrane that forms the basis of the umbilical cord is

  • 3)

    The most important hormone in intiating and maintaining lactation after birth is

  • 4)

    Assertion (A): The acrosome of the Sperm cell contains Sperm lysin.
    Reason (R): Sperm lysin destroys the deformed Sperm cells.

  • 5)

    _____ are endocrine cells.

12th Bio Zoology - Lesson 1 Important Question Paper - by Suchitra - Gobichettipalayam View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    Animals giving birth to young ones:

  • 3)

    Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Viviparous animals give better protection to their off springs.
    Reason: They lay their eggs in the safe places of the environment

  • 4)

    During favourable conditions ______ shows multiple fission.

  • 5)

    Plasmotomy is observed in ________

Biology 12th standard english medium frequently asked one mark questions - by Kavitha View & Read

  • 1)

    The gravid proglottids are cut off from the parent body in ______

  • 2)

    Regeneration was first studied by _______

  • 3)

    Regeneration was first studied in _______

  • 4)

    Starfish shown ______ type of regeneration.

  • 5)

    The sexual union of young individuals produced immediately after the division of the parent Cellis called _____

creative multiple choice questions in 12th biology chapter one - by Kavitha View & Read

  • 1)

    Conjugation is seen in _____

  • 2)

    Paedogamy is the sexual union of _____

  • 3)

    ______ is a seasonal breeder.

  • 4)

    Technique used for cultivation of sponges is based on ______

  • 5)

    External fertilization is seen is ______

+2 english medium Important multiple choice questions in biology chapter one - by Kavitha View & Read

  • 1)

    In which type of parthenogenesis are only males produced?

  • 2)

    Animals giving birth to young ones:

  • 3)

    The mode of reproduction in bacteria is by

  • 4)

    In which mode of reproduction variations are seen

  • 5)

    Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: In bee society, all the members are diploid except drones.
    Reason: Drones are produced by parthenogenesis