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12th Standard Biology English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Ten

12th Standard

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Biology

Time : 00:25:00 Hrs
Total Marks : 25

    Answer all the questions

    25 x 1 = 25
  1. All the following animals are continuous breeders, except.

    (a)

    Frogs

    (b)

    Honey bees

    (c)

    Poultry

    (d)

    Rabbit

  2. A few statements with regard to sexual reproduction are given below:
    i. Sexual reproduction does not always require two individuals
    ii. Sexual reproduction generally involves gametic fusion
    iii. Meiosis never occurs during sexual reproduction
    iv. External fertilization is a rule during sexual reproduction
    Choose the correct statements from the options below:

    (a)

    i and iv

    (b)

    i and ii

    (c)

    ii and iii

    (d)

    i and iv

  3. Mammalian egg is ______.

    (a)

    Mesolecithal and non cleidoic

    (b)

    Microlecithal and non cleidoic

    (c)

    Alecithal and non cleidoic

    (d)

    Alecithal and cleidoic

  4. A contraceptive pill prevents ovulation by ______.

    (a)

    blocking fallopian tube

    (b)

    inhibiting release of FSH and LH

    (c)

    stimulating release of FSH and LH

    (d)

    causing immediate degeneration of released ovum.

  5. Meselson and Stahl’s experiment proved

    (a)

    Transduction

    (b)

    Transformation

    (c)

    DNA is the genetic material

    (d)

    Semi-conservative nature of DNA replication

  6. The sporozoite of the malarial parasite is present in ______

    (a)

    saliva of infected female Anopheles mosquito

    (b)

    RBC of human suffering from malaria.

    (c)

    Spleen of infected humans

    (d)

    Gut of female Anopheles mosquito

  7. Which statement is wrong regarding the malaria?

    (a)

    In the human liver, the sporozoites undergo sexual fission

    (b)

    Erythrocytes lyse and relase the merozoites and haemozoin

    (c)

    In the mosquito's gut, the ookinete is formed

    (d)

    Male and female gametes develop in the body of a mosquito.

  8. Which of the following statement(s) is true regarding cancer cells?
    (a) Neoplasm or tumor cells show uncontrolled growth
    (b) They are metastatic
    (c) They lack contact inhibition
    (d) They may be benign or malignant

    (a)

    (a) only

    (b)

    (b) and (c)

    (c)

    (d) only

    (d)

    All the above

  9. Which of the following are likely to be present in deep-sea water?

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  10. Find the odd sentence out.
    (i) Biogas primarily consists of methane with CO2 and hydrogen
    (ii) The greater the BOD of wastewater the more its polluting potential
    (iii) World biofuel day is observed on 10th August
    (iv) Cyclosporin A is obtained from Trichoderma polysporum.

    (a)

    i and iii

    (b)

    ii and iv

    (c)

    i and iv

    (d)

    none of the above

  11. Transgenic animals are those which have

    (a)

    Foreign DNA in some of their cells

    (b)

    Foreign DNA in all their cells

    (c)

    Foreign RNA in some of their cells

    (d)

    Foreign RNA in all their cells

  12. Most popular sources of stem cells from their bank

    (a)

    amniotic cell bank

    (b)

    cord blood bank

    (c)

    plancenta blood bank

    (d)

    amniotic fluid cell bank

  13. Read the following four statements (A to D) about certain mistakes in two of them.
    a) The first transgenic buffalo, Rosie produced milk which was human alpha-lactalbumin enriched.
    b) Restriction enzymes are used in isolation of DNA from other macromolecules.
    c) Downstream processing is one of the steps of rDNA technology
    d) Disarmed pathogen vectors are also used in transfer of rDNA into the host.
    Which of the two statements have mistakes?

    (a)

    B and C

    (b)

    C and D

    (c)

    A and C

    (d)

    A and B

  14. The B-chain of Insulin is composed of ________ amino acids

    (a)

    70

    (b)

    30

    (c)

    45

    (d)

    60

  15. If a recessive gene is involved in causin genetic disease, what is the strategy to be in gene therapy in order to cure the disease

    (a)

    Injecting DNA into the genome

    (b)

    Injecting DNA and antisense gene

    (c)

    Injecting antisense gene

    (d)

    Removal of recessive gene

  16. Study the four statements (A to D) given below and select the two correct ones out of them.
    A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers.
    B) Predator starfish Pisaster helps in maintaining species diversity of some invertebrates.
    C) Predators ultimately lead to the extinction of prey species.
    D) Production of chemicals such as nicotine, strychnine by the plants is disordered.
    The two correct statements are

    (a)

    (B) and (C)

    (b)

    (C) and (D)

    (c)

    (A) and (D)

    (d)

    (A) and (B)

  17. A biologist studies the population of eats in a barn. He found that the average natality was 250, average mortality is 240, immigration is 20 and emigration to be 30. The  in population is

    (a)

    10

    (b)

    15

    (c)

    05

    (d)

    Zero

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

    (a)

    Tundra forest

    (b)

    Rain for forest of north east India

    (c)

    Taiga forest

    (d)

    Amazon rain forest

  19. A lake which is rich in organic waste may result in

    (a)

    Drying of the lake due to algal bloom

    (b)

    Increased population of fish due to lots of nutrients

    (c)

    Mortality of fish due to lack of oxygen

    (d)

    Increases population of aquatic organisms due to minerals

  20. Arrange the layers of anther wall from locus to periphery

    (a)

    Epidermis,middle layers, tapetum, endothecium

    (b)

    Tapetum, middle layers, epidermis, endothecium

    (c)

    Endothecium, epidermis, middle layers, tapetum

    (d)

    Tapetum, middle layers endothecium epidermis

  21. Test cross involves ____.

    (a)

    Crossing between two genotypes with recessive trait

    (b)

    Crossing between two F1 hybrids

    (c)

    Crossing the F1 hybrid with a double recessive genotype

    (d)

    Crossing between two genotypes with dominant trait

  22. Identify the non-fungal species used in SCP production.
    (i) Candida
    (ii) Chlorella
    (iii) Chlamydomonas
    (iv) Cellulomonas

    (a)

    i and ii

    (b)

    ii and iii

    (c)

    ii, iii and iv

    (d)

    All the above

  23. The term used to define the ability of a cell to generate entire individual is

    (a)

    Pleuripotent

    (b)

    Totipotent

    (c)

    Multipotent

    (d)

    Unipotent

  24. Read the statement and select the correct terminology for the same:
    "Carrying away of inorganic compounds of soil by water".

    (a)

    Eluviation

    (b)

    Fragmentation

    (c)

    Humification

    (d)

    Mineralisation

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