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Reproduction in Organisms - 3 marks

12th Standard EM

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Biology

Answer the following: 
Time : 01:00:00 Hrs
Total Marks : 120
    Part-A
    40 x 3 = 120
  1. The unicellular organisms which reproduce by binary fission are considered immortal. Justify

  2. Why is the offspring formed by asexual reproduction referred as a clone?

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

  4. Give reasons for the following:
    (a) Some organisms like honey bees are called parthenogenetic animals
    (b) A male honey bee has 16 chromosomes where as its female has 32 chromosomes

  5. What is asexual reproduction?

  6. What is repeated fission?

  7. Explain multiple fission in plasmodium.

  8. Explain encystment in amoeba.

  9. What is strobilation?

  10. Differentiate exogenous and endogenous budding.

  11. What is apolysis? Write its significance.

  12. Explain the types of fertilization depending on the place of occurrence.

  13. Differentiate autogamy and exogamy.

  14. Why is conjugation considered to be a form of reproduction though there is no formation of a new individual?

  15. What are gemmules?

  16. Draw a gemmule and label any 2 parts.

  17. Differentiate oviparous and viviparous condition.

  18. What is ovoviviparous condition?

  19. How does budding occurs is hydra?

  20. Describe pedal laceration.

  21. Describe the different phases of life cycle in an organism.


  22. (i) Identify the Process
    (ii) Name the Organism


  23. (i) Identify the animal
    (ii) What is significant about the animal.

  24. Compare schizogony with sporogony of Plasmodium

  25. How exogenous buds are developed by Hydra?

  26. Apolysis favors Taenia solium. How?

  27. Give the definition for (a) Arrhenotoky (b) Thelytoky (c) Amphitoky

  28. What is Incomplete parthenogenesis? Explain with example.

  29. Explain briefly on the nature of Ovovivipary.

  30. Enumerate the types of syngamy

  31. Name the types of animals based on embryonic development with an example for each.

  32. Write a short note on phases of life cycle.

  33. Differentiate between asexual and sexual reproduction

  34. Under threat or attack, garden lizard loses a part of its tail which trembles and avert the attention of predators, so that the lizard escapes later the tail regrown for lizard. The same phenomenon can also be noticed in organisms like starfish etc. What do you call this phenomeaon? Define it.

  35. Complete the table.

      Natural Parthenogenesis Sex of developing organism
    i. Arrhenotoky A
    ii. Thelytoky B
    iii. Amphitoky C
  36. In Vivipary, how the developing embryos are nourished?

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

  38. '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

  39. Complete the flow chart by mentioning the ploidy of cells in boxes.

  40. Meiosis is a type of cell division where the chromosomal number is reduced to half the number daughter cells. Which type of cellular division occurs in the drones to produces spermatozoa? Why?

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