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12th Standard Biology English Medium Reduced Syllabus Model Question paper - 2021 Part - 2

12th Standard

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Biology

Time : 02:45:00 Hrs
Total Marks : 70

      Part I

      Answer all the questions.

      Choose the most suitable answer from the given four alternatives and write the option code with the corresponding answer.

    15 x 1 = 15
  1. 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

    (a)

    If both A and R are true and R is correct explanation for A

    (b)

    If both A and R are true but R is not the correct explanation for A

    (c)

    If A is true but R is false

    (d)

    If both A and R are false

  2. The site of embryo implantation is the

    (a)

    Uterus

    (b)

    Peritoneal cavity

    (c)

    Vagina

    (d)

    Fallopian tube

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

    (a)

    Syphilis, gonorrhoea and candidiasis

    (b)

    Syphilis, chlamydiasis and gonorrhoea

    (c)

    Syphilis, gonorrhoea and trichomoniasis

    (d)

    Syphilis, trichomoniasis and pediculosis

  4. Father of a child is colourblind and mother is carrier for colourblindness, the probability of the child being colourblind is

    (a)

    25%

    (b)

    50%

    (c)

    100%

    (d)

    75%

  5. DNA and RNA are similar with respect to

    (a)

    Thymine as a nitrogen base

    (b)

    A single-stranded helix shape

    (c)

    Nucleotide containing sugars, nitrogen bases and phosphates

    (d)

    The same sequence of nucleotides for the amino acid phenyl alanine

  6. Fossils are generally found in

    (a)

    igneous rocks

    (b)

    metamorphic rocks

    (c)

    volcanic rocks

    (d)

    sedimentary rocks

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

    (a)

    Chain A has 12 and Chain B has 13

    (b)

    Chain A has 21 and Chain B has 30 amino acids

    (c)

    Chain A has 21 and Chain B has 30 amino acids

    (d)

    Chain A has 12 and chain B has 20 amino acids.

  8. With which of the following, the Agenda 21’ of Rio Summit, 1992 is related to?

    (a)

    Sustainable development

    (b)

    Combating the consequences of population

    (c)

    Mitigation norms of Green House Gases (GHGs) emission

    (d)

    Technology transfer mechanism to developing countries for ‘clean-energy’ production

  9. 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

  10. In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed pant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in F1 generation?

    (a)

    9:1

    (b)

    1:3

    (c)

    3:1

    (d)

    50:50

  11. The dominant epistatis ratio is

    (a)

    9:3:3:1

    (b)

    12:3:1

    (c)

    9:3:4

    (d)

    9:6:1

  12. Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.
    Reason (R): Because they carry lower energy to non-ionize electrons from atom

    (a)

    A is correct. R is correct explanation of A

    (b)

    A is correct. R is not correct explanation of A

    (c)

    A is correct. R is wrong explanation of A

    (d)

    A and R is wrong

  13. Which of the following one is used as a Biosensors?

    (a)

    Electrophoresis

    (b)

    Bioreactors

    (c)

    Vectors

    (d)

    Electroporation

  14. Which of the following statement is correct

    (a)

    Agar is not extracted from marine algae such as seaweeds

    (b)

    Callus undergoes differentiation and produces somatic embryoids.

    (c)

    Surface sterilization of explants is done by using mercuric bromide

    (d)

    PH of the culture medium is 5.0 to 6.0

  15. The following diagram represents

     

    (a)

    pyramid of number in a grassland
    ecosystem

    (b)

    pyramid of number in a grassland ecosystem

    (c)

    pyramid of number in a pond ecosystem

    (d)

    pyramid of biomass in a pond ecosystem

    1. Part II

      Answer any 6 questions. Question no. 21 is compulsory.

    6 x 2 = 12
  16. Expand RZWT and DEWATS.

  17. List any four adverse effect of noise.

  18. Write the names of organisms that undergo the following types of asexual reproduction.
    (a) Budding
    (b) fragmentation
    (c) Regeneration
    (d) Gemma cup formation.

  19. Write the equivalent botanical terms for the following words/sentences.
    (a) Landing platform of pollen.
    (b) Ovarian cavity
    (c) Megasporangium
    (d) Basal swollen part of a pistil

  20. Define Biopiracy.

  21. Which kind of organisms constitute the pioneer community and climax community of a Hydrosere succession?

    1. Part III

      Answer any 6 questions. Question no. 27 is compulsory.

    6 x 3 = 18
  22. Point out any four conditions under which Hardy Weinberg's equilibrium is not attained.

  23. Explain
    (a) Cell Mediated Immunity
    (b) Antibody Mediated Immunity

  24. What is 'activated sludge' in sewage treatment?

  25. How Bacillus thuringiensis provides insect resistance?

  26. Why is E.Coli not used for production of Interferons?

  27. What is photokinesis?

    1. Part IV

      Answer all the questions.

    5 x 5 = 25
  28. The following is the illustration of the sequence of ovarian events (a-i) in a human female.

    a) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
    b) Name the ovarian hormone and the pituitary hormone that have caused the above-mentioned events.
    c) Explain the changes that occurs in the uterus simultaneously in anticipation.
    d) Write the difference between C and H.

  29. Write the preventive measures of STDs.

  30. What are IUD's? Explain its way of functioning. Also describe their types.

  31. Explain the formation of a nucleosome.

  32. List the advantages of biogas plants in rural areas.

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