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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 ?

Differences between zoospore and zygote

Zoospore

Zygote

1.It is an asexual spore produced by the some algae and fungi species.

2.It is haploid or diploid in nature.

3. It is motile and flagellated

1. It is a cell produced by sexual reproduction by the fusion of male and female gametes.

2. It is diploid in nature.

3. It is motile or non motile and non flagellated

Zoospores are asexual reproductive structures formed by some fungi or algae species for reproduction. They are microscopic motile species bearing flagella. They may be haploid or diploid in nature.

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46. How does Bryophyllum plant propagate?
Or

Why do the new plants grow on Bryophyllum leaf ?

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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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