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Reproduction in Organisms

Short Answer Type

51. What is life span ?

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52. Write the approximate average life span of following organisms :

May fly, wheat, monkey, dog, cat, horse, elephant, eagle, man, parrot, tortoise, Banyan tree and sequoia tree. Name the oldest tree.

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53. Distinguish between asexual and sexual reproduction. Why is vegetative reproduction also considered as a type of asexual reproduction ?

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54. List the different ways of asexual reproduction.

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Long Answer Type

55. Discuss the advantages and disadvantages of asexual reproduction.

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Short Answer Type

56. What is vegetative propagation ? Give two suitable examples.

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57. Discuss the advantages and disadvantages of sexual reproduction.

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Long Answer Type

58. Describe the fission in yeast.

Yeast has asexual reproduction by fission. During fission in yeast the cell divides unequally. Small buds are formed which may initially remain attatched to the mother cell and then separate and grow into new individuals. The nucleus divides into two daughter nuclei by Karyokinesis. The daughter nuclei separate. The cytoplasm also divides by cytokinesis. A double cross wall is deposited in the furrow to form two daughter cells. The middle part of the double cross wall degenerates and the daughter cells separate.

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Short Answer Type

59. Show the different kinds of asexual reproductive structures.

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Long Answer Type

60.

Describe fission in animals as mode of reproduction.

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