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12th Standard Bio-Zoology English Medium Reproduction in Organisms Reduced Syllabus Important Questions With Answer Key 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. In which type of parthenogenesis are only males produced?

    (a)

    Arrhenotoky

    (b)

    Thelytoky

    (c)

    Amphitoky

    (d)

    Both a and b

  2. 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

    (a)

    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.

  3. Transverse Binary fission is seen is ______

    (a)

    Vorticella

    (b)

    Paramecium

    (c)

    Plasmodium

    (d)

    Euglena

  4. Regeneration is not seen in ______

    (a)

    Starfish

    (b)

    Lizard

    (c)

    Hydra

    (d)

    Sea Anemone

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

    (a)

    Autogamy

    (b)

    Syngamy

    (c)

    Morphallaxis

    (d)

    Hologamy

  6. Conjugation is a type of ______

    (a)

    Asexual reproduction

    (b)

    Autogamy

    (c)

    External fertilization

    (d)

    Sexual reproduction

  7. ______ refers to the fusion of small sized, morphologically different gametes.

    (a)

    Isogamy

    (b)

    Hologamy

    (c)

    Paedogamy

    (d)

    Merogamy

  8. In _____ types of natural parthenogenesis only females are produced.

    (a)

    Thelytoky

    (b)

    Arrhenotoky

    (c)

    Amphitoky

    (d)

    Arrhenotoky

  9. In _____ types of parthenogenesis egg can develop into individuals of any sex.

    (a)

    Thelytoky

    (b)

    paedogenesis

    (c)

    Amphitoky

    (d)

    Arrhenotoky

  10. Given below, are a few statements related to external fertilization. Choose the correct statements:
    i. The male and female gametes are formed and released simultaneously
    ii. Only a few gametes are released into the medium
    iii. Water is the medium in a majority of organism exhibiting external fertilization
    iv. Offspring formed as a result of external fertilization have better chance of survival than those formed inside the organism

    (a)

    iii and iv

    (b)

    i and iii

    (c)

    ii and iv

    (d)

    i and iv

  11. Transverse binary fission is noticed in _________________

    (a)

    Amoeba

    (b)

    Planaria

    (c)

    Ceratium

    (d)

    Vorticella

  12. Identify the incorrect statement regarding parthenogenesis.

    (a)

    Development of sperm without fertilization.

    (b)

    It was first discovered by Charles Bonnet.

    (c)

    Honey bees exhibit incomplete parthenogenesis

    (d)

    Amphitoky is a type of natural parthenogenesis.

  13. Identify the wrong statement.

    (a)

    Oviparous animals lays eggs.

    (b)

    Viviparous animals give rise to young ones

    (c)

    Ovoviviparous animals lays eggs and then hatch it to young ones.

    (d)

    Amphibians are oviparous animals

  14. Identify the mismatched pair.

    (a)

    Paedogenesis - Liver fluke

    (b)

    Strobilation - Aurelia

    (c)

    Amphitoky - Honeybee

    (d)

    Encystment - Amoeba

  15. Which among the following animals exhibit ovoviviparity?

    (a)

    frog

    (b)

    shark

    (c)

    sheep

    (d)

    hen

  16. 2 Marks

    10 x 2 = 20
  17. Name an organism where cell division is itself a mode of reproduction.

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

  19. What is morphallaxis?

  20. What is syngamy?

  21. Define conjugation.

  22. How are animals classified based on breeding periods?

  23. Mention the phases in the life cycle of an organism.

  24. With regard to asexual reproduction. mention two phenomena seen is Hydra.

  25. Mention the different modes of asexual reproduction.

  26. Identify the parts marked as A, B, C, D, E and F for the below diagram.

  27. 3 Marks

    10 x 3 = 30
  28. The unicellular organisms which reproduce by binary fission are considered immortal. Justify

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

  30. What is asexual reproduction?

  31. What are gemmules?

  32. What is ovoviviparous condition?

  33. How exogenous buds are developed by Hydra?

  34. Enumerate the types of syngamy

  35. Differentiate between asexual and sexual reproduction

  36. How Charles Bonnet and Abraham Trembley contributed to Biological filed?

  37. 'A' and 'B' are the male & female sex cells respectively which look alike and performs similar functions. 'A' and 'B' fuse to form a new individual 'D'. Which type of gametic fusion does this represent? Give an example

  38. 5 Marks

    7 x 5 = 35
  39. Differentiate between the following:
    (a) Binary fission in amoeba and multiple fission in Plasmodium
    (b) Budding in yeast and budding in Hydra
    (c) Regeneration in lizard and Planaria

  40. How is juvenile phase different from reproductive phase?

  41. What is the difference between syngamy and fertilization?

  42. Explain parthenogenesis.

  43. Write notes on binary fission in animals.

  44. Describe the regeneration process noticed in living organism.

  45. Given an account on following terms.
    (a) Hologamy
    (b) Isogamy
    (c) Anisogamy
    (d) Merogamy
    (e) Paedogamy

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