12th Standard CBSE Biology Study material & Free Online Practice Tests - View and download Sample Question Papers with Solutions for Class 12 Session 2019 - 2020 CBSE

Biology Question Papers & Study Material

12th Standard CBSE Biology Strategies for Enhancement in Food Production Model Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    In hybridization, the haploids combine the advantages of

  • 2)

    Which one of the following substance is responsible for callus formation

  • 3)

    In tissue cultural medium, the embryoids formed from pollen grains is due to

  • 4)

    A cybrid is a hybrid carrying

  • 5)

    The scientific by which crop plants are enriched with certain  desirable nutrients is called

12th Standard CBSE Biology Human Health and Disease Model Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    L.S.D, morphine and bhang are respectively obtained from

  • 2)

    HIV attacks which of the following?

  • 3)

    Opiates (opium, heroin) are obtained from

  • 4)

    THC is associated with

  • 5)

    T-lymphocytes first mature in

12th Standard CBSE Biology Unit 7 Evolution Model Questions Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Which of the following evolved first

  • 2)

    Which of the following walked upright?

  • 3)

    Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks.More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms,includes

  • 4)

    De Vries gave his mutation theory on organic evolution while working on

  • 5)

    Peripatus is a connecting link between

12th Standard CBSE Biology Unit 6 Molecular Basic of Inheritance Model Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Jumping genes given by Barbara Mclintock are also called

  • 2)

    Temin and Baltimore are associated with the discovery of

  • 3)

    How many codons code for amino acids?

  • 4)

    How many base pairs are present in DNA cut by endonuclease

  • 5)

    In DNA, guanine and cytosine are bonded with how many hydrogen bonds?

12th CBSE Biology Unit 5 Principles of Inheritance and Variation Important Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Two crosses between the same pair of genotype or phenotypes in which the sources of the gametes are reversed in one cross, is known as

  • 2)

    In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed with a plant that is rrtt

  • 3)

    A self-fertilizing trihybrid plant forms

  • 4)

    A male human is heterozygous for autosomal genes A and B and is hemizygous for haemophilic gene h. What proportion of his sperms will be abh?

  • 5)

    By which process there is a gain o segment of DNA which results in alteration in chromosome?

12th CBSE Biology Unit 4 Reproductive Health Important Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Which of the following birth control measures can be considered as the safest?

  • 2)

    Which of the following is the component of oral pills?

  • 3)

    Choose the correct answer regarding the ZIFT procedure?

  • 4)

    The correct surgical procedure as a contraceptive method is:

  • 5)

    Which one of the following groups includes all sexually transmitted diseases?

12th CBSE Biology Unit 3 Human Reproduction Important Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    In human beings, the eggs are:

  • 2)

    Some important events in the human female reproductive cycle are given below.Arrange the events in a proper sequence.A-secretion of FSH, B-growth of corpus luteum, C-growth of the follicle and oogenesis, D-ovulation, E-sudden increase in the levels of LH

  • 3)

    Ist polar body is formed at which state of oogenesis?

  • 4)

    Which one of the following is the most likely root cause why menstruation is not taking place in the regularly cycling human female?

  • 5)

    Which one of the following statements is false in respect of viability of mammalian sperm?

12th CBSE Biology Unit 2 Sexual Reproduction in Flowering Plants Important Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Egg apparatus consists of

  • 2)

    Which type of association is found in between entomophilous flower and pollinating agent?

  • 3)

    Pick the odd one out

  • 4)

    The pollen tube usually enters the embryo sac

  • 5)

    Which one of the following represents an ovule, where the embryo sac becomes horse-shoe shaped and the funiculus and micropyle are close to each other?

12th CBSE Biology Unit 1 Reproduction in Organisms Important Question Paper - by Shweta Sharma - Anantapur - View & Download

  • 1)

    Which of the following statements is true of yeast?

  • 2)

    Which of the following statements is true of Bryophyllum?

  • 3)

    Which of the following statements is true of ginger?

  • 4)

     scion grafted to a stock. The quality of fruits produced will be determined by the genotype of 

  • 5)

    In which of the following organism, self-fertilization is seen?

12th Standard CBSE Biology Model Question Paper - by Bala - View & Download

  • 1)

    Write two major adaptations in animals exhibiting external fertilization.

  • 2)

    The following statements (i),(ii) and (iii) seem to describe the water-pollination submerged plants. Which one of these statements is incorrect?

    (i) The flowers do not produce nectar.

    (ii) The pollen grains have mucilaginous covering.

    (iii) The brightly-coloured female flowers have long stalks to reach the surface.

  • 3)

    Sperms have a tail, whereas eggs do not.Why so?

  • 4)

    Comment on the RCH programme of the government to improve the reproductive health of the people.

  • 5)

    What is recombination?

Biology Class 12 CBSE Public model paper with answer key - by Bala - View & Download

  • 1)

    Name biotic agencies of pollination.

  • 2)

    How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 25 microspore mother cells and 25 megaspore mother cells, respectively.

  • 3)

    What is "afterbirth".

  • 4)

    Why it is necessary to check the population growth?

  • 5)

    Enlist the steps of controlled cross-pollination. Would emasculation be needed in a cucurbit plant? Give reasons for your answer.

Biology CBSE Class 12 Model Question ( Full Portion ) - by Bala - View & Download

  • 1)

    How does Penicillium reproduce asexually?

  • 2)

    (i) Given below is a T.S. of an apple. Identify a, b and c.
    (ii) Why is an apple categorised as a false fruit?

  • 3)

    What is mesovarium?

  • 4)

    Mention two advantages of lactational amenorrhoea as a contraceptive method.

  • 5)

    How many linkage  groups are found in man?

CBSE 12th Biology Organisms and Populations Important Questions - by Bala - View & Download

  • 1)

    Maximum growth rate occurs in 

  • 2)

    In which one of the following habitats does the diurnal temperature of soil surface vary most?

  • 3)

    The term ecology was coined by

  • 4)

    Pneumatophores are present/common in 

  • 5)

    Animals undergo inactive stage during winter is known as

12th CBSE Biology Ecosystem Important Questions - by Bala - View & Download

  • 1)

    Which one of the following has the largest population in a food chain?

  • 2)

    Thye second trophic level in a lake is

  • 3)

    Which of the following process helps in nutrient conservation?

  • 4)

    Which of the following represents the sedimentary type of nutrient cycle?

  • 5)

    Photosynthetic active radiation (PAR) has the following range of wavelengths

12th Biology Biodiversity and Conservation Important Question Paper - by Bala - View & Download

  • 1)

    In 1984, the Bhopal gas tragedy took place because methyl isocyanate

  • 2)

    Minamata disease was caused due to the consumption of

  • 3)

    Which one of the following is not used for disinfection of drinking water?

  • 4)

    It is estimated that out of the total global warming the relative contribution of CO2, CH4, CFCs and N2O are

  • 5)

    Which of the following is not a green house gas?

12th CBSE Biology Environmental Issues Important Question Paper - by Bala - View & Download

  • 1)

    In your opinion, which is the most effective way to consrve the plant diversity of an area?

  • 2)

    Which of the following pairs of an animal and a plant represents endangered organisms in India?

  • 3)

    Which national park is the new home of the Indian one-horned rhinoceros?

  • 4)

    Which of the following group of plants exhibit more species diversity?

  • 5)

    Total number of identified biodiversity hotspots in the world is

12th Biology Revision Model Question Paper 1 - by Bala - View & Download

  • 1)

    Which of the following statements is true of yeast?

  • 2)

    Female heterogamy is found in

  • 3)

    Which of the following walked like gorillas and chimpanzees?

  • 4)

    Name an external medium that helps in gamete transfer.

  • 5)

    What is the major differences you observe in the offsprings produced by asexual reproduction and in the progeny produced by sexual reproduction?

Class 12 CBSE Biology Value Based Questions - by Bala - View & Download

  • 1)

    Which of the following antibiotic is active against fungus?

  • 2)

    Which of the following is maintained for optimum production of vinegar?

  • 3)

    Which of the following is widely used as a successful biofertiliser in Indian rice field?

  • 4)

    Select the correct combination of the statements (a-d regarding the characteristics of certain organisms
    (1) Methanogens are archaebacteria which produce methane in marshy areas.
    (2) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen.
    (3) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.
    (4) Mycoplasma lacks a cell wall and can survive without oxygen.

  • 5)

    When domestic sewage mixes with-------

CBSE Grade 12 Biology Term Test - by Bala - View & Download

  • 1)

    Intraspecific incompatability can be overcome by

  • 2)

    Which type of association is found in between entomophilous flower and pollinating agent?

  • 3)

    Plants of which one of the following groups of genera are pollinated by the same agency?

  • 4)

    Which one of the following is surrounded by a callose wall?

  • 5)

    From among the sets of terms given below, Identify those that are associated with gynoecium.

Evolution - Important Questions Model Paper 1 In 12th Biology - by Bala - View & Download

  • 1)

    Presence of gills in the tadpole of frog indicates that

  • 2)

    Which of the following is a living fossil?

  • 3)

    Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks.More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms,includes

  • 4)

    A baby has been born with a small tail.It is a case exhibiting

  • 5)

    Which of the following is the relatively most accurate method of dating of fossils?

Grade 12 CBSE Biology Term 1 Model Question Paper - by Bala - View & Download

  • 1)

    Which of the following statements is true of yeast?

  • 2)

    Which of the following statements is true of Bryophyllum?

  • 3)

    Chiropterophily means...

  • 4)

    Through which cell of the embryo sac, does the pollen tube enter the embryo sac?

  • 5)

    Which one of the following pairs of plant structures has a haploid number of chromosomes?

Environmental Issues - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Which one of the following is a pair of endangered species?

  • 2)

    Which of the following is considered a hot-spot of biodiversity in India?

  • 3)

    Which of the following regions of our country are known for their rich biodiversity?

  • 4)

    Quinine is obtained from

  • 5)

    A taxon which is facing an extremely high risk of extinction in the wild in immediate future is known as

12 Biologly Model Question Paper 3 - by Bala - View & Download

  • 1)

    In 1984, the Bhopal gas tragedy took place because methyl isocyanate

  • 2)

    Blood analysis of a patient reveals an usually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct? The patient has been inhaling polluted air containing unusually high content of

  • 3)

    The noise produced in office is normally at the level of

  • 4)

    Minamata disease was caused due to the consumption of

  • 5)

    Expand BOD

Ecosystem - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Secondary producers are

  • 2)

    Secondary producers are

  • 3)

    Which of the following represents the sedimentary type of nutrient cycle?

  • 4)

    Given is one of the types of ecological pyramids. This type represents

  • 5)

    Term ecosystem was given by

12 Biologly Model Question Paper 2 - by Bala - View & Download

  • 1)

    Lichens are well known combination of an alga and a fungus where fungus has

  • 2)

    What is a keystone species?

  • 3)

    Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.

  • 4)

    Select the statement which explains best parasitism.

  • 5)

    Keystone species deserve protection because these

Microbes In Human Welfare - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Bacillus thuringiensis (Bt) strains have been used for designing novel

  • 2)

    A good example of organic fertilizer which improves phosphorus uptake is

  • 3)

    Which of the following is maintained for optimum production of vinegar?

  • 4)

    Cyclosporin-A an immunosuppressive drug is produced by

  • 5)

    Saccharomyces cerevisiae is used for production of

Strategies For Enhancement In Food Production - Important Questions Model Question Paper 1 In 12th Biology - by Bala - View & Download

  • 1)

    Which one of the following is not s secondary metabolite?

  • 2)

    A major application of embryo culture is

  • 3)

    'None gene' of dwarfness in wheat originated through spontaneous mutation in

  • 4)

    The scientific by which crop plants are enriched with certain  desirable nutrients is called

  • 5)

    More than 70% of livestock population is in :

Human Health And Disease - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    L.S.D, morphine and bhang are respectively obtained from

  • 2)

    HIV mainly infects

  • 3)

    In malaria, the product released by mosquito into blood that causes chill and fever is called

  • 4)

    Active immunity developed is related to

  • 5)

    If the person shows the production of interferons in his body, chances are that he suffering from

Evolution - Important Questions Model Paper 2 In 12th Biology - by Bala - View & Download

  • 1)

    Which of the following is a living fossil?

  • 2)

    The most likely reason for the development of resistance against pesticides in insects damaging the crops is

  • 3)

    3-5 billion years ago, which flora dominated the earth?

  • 4)

    The surprise products in the Miller's experiment were

  • 5)

    Darwin's theory states that

Molecular Basic Of Inheritance - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Jumping genes given by Barbara Mclintock are also called

  • 2)

    In DNA replication, leading strand replicates in

  • 3)

    The correctly matched pair is

  • 4)

    Intrinsic flow of information means

  • 5)

    Whose experiments cracked the DNA and discovered unequivocally that a genetic code is a 'triplet'?

Principles Of Inheritance And Variation - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Heterozygous purple flower is crossed with recessive white flower. The progeny has the ratio :

  • 2)

    Two crosses between the same pair of genotype or phenotypes in which the sources of the gametes are reversed in one cross, is known as

  • 3)

    How many different types of gametes can be formed by F1 progeny, resulting from the following cross
    AABBCC \(\times\) aa bb cc

  • 4)

    Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to

  • 5)

    Indicate, the inheritance of which of the following is controlled by multiple alleles

Reproductive Health - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Which of the following birth control measures can be considered as the safest?

  • 2)

    Choose the correct answer regarding the ZIFT procedure?

  • 3)

    Cu ions released from copper releasing Intra Uterine Devices(IUDs)

  • 4)

    Oral contraceptive pills helps in birth control by 

  • 5)

    It is a disease which mainly affects mucous membrane of urinogenital tract. In males, burning feeling on passing urine, after a yellow discharge occurs, that is accompanied by fever, headache and feeling of illness. Its name is

Human Reproduction - Important Questions Model Paper In 12th Biology - by Bala - View & Download

  • 1)

    Some important events in the human female reproductive cycle are given below.Arrange the events in a proper sequence.A-secretion of FSH, B-growth of corpus luteum, C-growth of the follicle and oogenesis, D-ovulation, E-sudden increase in the levels of LH

  • 2)

    Which one of the following is the correct matching of the events occurring during menstrual cycle?

  • 3)

    Which of the following hormones is not secreted by human placenta?

  • 4)

    Urethral meatus refers to the

  • 5)

    The Leydig cells found in the human body are the secretory source of

12 Biologly Model Question Paper 4 - by Bala - View & Download

  • 1)

    Egg apparatus consists of

  • 2)

    In angiosperms, pollen tubes liberate their male gametes into the

  • 3)

    Insect-pollinated flowers are characterized by

  • 4)

    In a flowering plant, archesporium gives rise to

  • 5)

    An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is

Reproduction In Organisms - Important Questions Model Paper 1 In 12th Biology - by Bala - View & Download

  • 1)

    Which of the following statements is true of yeast?

  • 2)

    Which of the following statements is true of ginger?

  • 3)

    Which of the following statements true of date plam?

  • 4)

    Which of the following animal is having longitudinal binary fission?

  • 5)

    vegitative propagation in mint occurs by 

12th Biology Model Question Paper 1 - by Bala - View & Download

  • 1)

    Which of the following statements is true of yeast?

  • 2)

    Which of the following statements true of date plam?

  • 3)

    Milky water of tender coconut is

  • 4)

    Which among the following has 23 chromosomes?

  • 5)

    Ina normal pregnant woman, the amount of total gonadotropin activity was assessed. the result expected was

12th Biology Model Question Paper 5 - by ADMIN-ENGLISH - View & Download

12th Biology Model Question Paper 4 - by ADMIN-ENGLISH - View & Download

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Evolution - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Strategies For Enhancement In Food Production - Important Questions Model Question Paper 2 In 12th Biology - by ADMIN-ENGLISH - View & Download

Reproductive Health - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Principles Of Inheritance And Variation - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Organisms And Populations - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Molecular Basis Of Inheritance - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Microbes In Human Welfare - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Human Reproduction - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Human Health And Disease - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Environmental Issues - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Ecosystem - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Biotechnology - Principles And Processes - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Biotechnology And Its Applications - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Biodiversity And Conservation - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Sexual Reproduction In Flowering Plants - Important Questions Model Question Paper In 12th Biology - by ADMIN-ENGLISH - View & Download

Reproduction In Organisms - Important Questions Model Paper 2 In 12th Biology - by ADMIN-ENGLISH - View & Download

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Top Tips to score high marks in CBSE Class 12 Biology Bala

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Term I Syllabus - Important Questions Model Paper In 12th Biology ADMIN-ENGLISH

Term I Exam Syllabus Chapter Covered: Unit VI & VII The chapter that covers the Unit is Chapter-1: ...

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CBSEStudy Material - Sample Question Papers with Solutions for Class 12 Session 2019 - 2020

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