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Reproduction in Organisms

Short Answer Type

41. Name the three phases in the life span of an organism.

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42. Why do internodal segments of sugarcane fail to propagate vegetatively even when they are in contact with damp soil ?

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Long Answer Type

43. Define
(i) Juvenile phase
(ii) Reproductive phase
(iii) Senescent phase.

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Short Answer Type

44. Explain the process of budding in yeast.

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45. Differentiate between a zoospore and a zygote.
Or

What is zoospore ?

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46. How does Bryophyllum plant propagate?
Or
Why do the new plants grow on Bryophyllum leaf ?

Propagation of Bryophyllum. In Bryophyllum, leaf helps in vegetative propagation. In the leaf there are notches, where meristem is present. When leaf comes in contact with soil, this meristem produces a new plant.

Leaf of Bryophyllum with young plants.

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Long Answer Type

47. Define external fertilization. Mention its disadvantages.

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48. Higher organisms have resorted to sexual reproduction inspite of its complexity. Why ?

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Short Answer Type

49. What is a bisexual flower ? Collect five bisexual flowers from your neighbourhood and with the help of your teacher find out their common and scientific names.

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