Examine a few flowers of any cucurbit plant and try to identify t

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 Multiple Choice QuestionsShort Answer Type

71. Explain the significance of fertilization.
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 Multiple Choice QuestionsLong Answer Type

72. What do you understand by vegetative methods of reproduction ? Explain with examples
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73. Describe the importance of vegetative propagation.
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 Multiple Choice QuestionsShort Answer Type

74.

Which is a better mode of reproduction: sexual or asexual? Why?

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75.

Explain why meiosis and gametogenesis are always interlinked?

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76.

Describe the post-fertilisation changes in a flower.

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77.

Examine a few flowers of any cucurbit plant and try to identify the staminate and pistillate flowers. Do you know any other plant that bears unisexual flowers?


Cucurbits are unisexual plants. The staminate or male flowers are bright, yellow coloured. The staminate flowers bear bright, yellow coloured petals bearing stamens. Whereas, the pistillate flowers have pistil. Other examples of unisexual flowers are papaya, cucumber, etc.

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78.

Why are offspring of oviparous animals at a greater risk as compared to offspring of viviparous animals?

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79.

Give an example of an organism that enters 'diapause' and why.

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80.

Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

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