Quarterly Model Question Paper

12th Standard EM

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Biology

Time : 02:45:00 Hrs
Total Marks : 70
    16 x 1 = 16
  1. In which type of parthenogenesis are only males produced?

    (a)

    Arrhenotoky

    (b)

    Thelytoky

    (c)

    Amphitoky

    (d)

    Both a and b

  2. During favourable conditions ______ shows multiple fission.

    (a)

    Plasmodium

    (b)

    Amoeba

    (c)

    Planaria

    (d)

    Euglena

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

    (a)

    Allantois

    (b)

    Amnion

    (c)

    Chorion

    (d)

    Yolk sac

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

    (a)

    AB

    (b)

    O

    (c)

    A

    (d)

    B

  6. The Neanderthal man had the brain capacity of

    (a)

    650 – 800cc

    (b)

    1200cc

    (c)

    900cc

    (d)

    1400cc

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

    (a)

    Bacillus thurigiensis

    (b)

    Bacillus subtilis

    (c)

    Lactobacillus acidophilus

    (d)

    Streptococcus lactis

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

    (a)

    Archaebacteria

    (b)

    Eubacteria

    (c)

    Blue-green algae

    (d)

    Saprophytic fungi

  9. Assertion (A): Movement of organism from one place to another and back is called migration.
    Reason (R): Eel is an example for anadromous migration.

    (a)

    Both A and R are correct R explain A

    (b)

    A is correct R is incorrect

    (c)

    R does not explain A

    (d)

    Both A and R are incorrect

  10. Choose the correct statement(s) about tenuinucellate ovule

    (a)

    Sporogenous cell is hypodermal

    (b)

    Ovules have fairly large nucellus

    (c)

    sporogenous cell is epidermal

    (d)

    ovules have single layer of nucellus tissue

  11. What is the phenotypic ratio in case of incomplete dominance?

    (a)

    9: 7

    (b)

    3: 1

    (c)

    1: 2 : 1

    (d)

    1: 1 : 1 : 1

  12. Assertion (A): Complete linkage is noticed in male species of Drosophila.
    Reason (R): Completely linked genes show some crossing over.

    (a)

    A is true R is false

    (b)

    Both A and R are false

    (c)

    A is true, R is not correct explanation for A

    (d)

    R explains A

  13. An antibiotic gene in a vector usually helps in the selection of

    (a)

    Competent cellsc

    (b)

    Transformed cells

    (c)

    Recombinant cells

    (d)

    None of the above

  14. Identify the plant tissue used for virus free germplasm

    (a)

    Apical meristem

    (b)

    Intercalary meristem

    (c)

    Lateral meristem

    (d)

    Plate meristem

  15. Autoecology deals with the study of ___________.

    (a)

    Community

    (b)

    Population

    (c)

    Individual species

    (d)

    Niche of species

  16. Assertion (A) : Plains and valleys are rich in vegetation
    Reason (R): Slow drain of surface water and better water retention is noticed.

    (a)

    A is true R is false

    (b)

    R explains A

    (c)

    A and R are false

    (d)

    A and R are true. But R doesnot explains A

  17. 8 x 2 = 16
  18. What is plasmotomy?

  19. How is polyspermy avoided in humans?

  20. Comment on Trisomy-21.

  21. Highlight the milestones from the history of plant embryology.

  22. Give any four unique characters exhibited by anemophilous flowers.

  23. What is cell suspension culture?

  24. Soil formation can be initiated by biological organisms. Explain how?

  25. Write a brief note on pneumatophores. Give an example.

  26. 6 x 3 = 18
  27. Differentiate between asexual and sexual reproduction

  28. What are Coacervates?

  29. Why does the zygote divides only after the division of Primary endosperm cell.

  30. How tongue grafting differs from wedge grafting?

  31. Write the salient features of Sutton and Boveri concept.

  32. Why do submerged plants receive weak illumination than exposed floating plants in a lake?

  33. 4 x 5 = 20
  34. Explain the role of oxytocin and relaxin in parturition and lactation.

  35. Give an account of helminthic disease.

  36. Describe the structure of lymph node with a labeled diagram

  37. Describe dispersal of fruit and seeds by animals.

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