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Sexual Reproduction in flowering Plants

Short Answer Type

91. Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why sporopollenin is considered the most resistant organic material?

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92.

State what is apomixis. Comment on its significance. How can it be commercially used?

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93.

Name the part of the flower which the tassels of the corn-cob represent.

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Long Answer Type

94.

(a) Explain the different ways apomictic seeds can develop. Give an example of each.

(b) Mention one advantage of apomictic seeds to farmers.

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Short Answer Type

95.

How do the pollen grains of Vallisneria protect themselves?

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96. Differentiate between perisperm and endosperm giving one example of each.

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97.

Out of many papaya plants growing in your garden, only a few bear fruits. Give reason.

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Long Answer Type

98.

(a) Explain the post-pollination events leading to seed production in angiosperms.

(b) List the different types of pollination depending upon the source of pollen grains.

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Short Answer Type

99.
A. Draw a labelled diagram of L.S. of an embryo of grass (any six labels).

B, Give reason for each of the following:

(i) Anthers of angiosperm flowers are described as dithecous.
(ii) Hybrid seeds have to be produced year after year.

(A) L.S. of an embryo of grass.

.

B

i. Each anther of the angiosperm flower is bilobed in nature with two layered protection called theca (dithecous). Each theca is separated by longitudinal grooves. Bilobed nature is distinct in transverse section, microsporangia is located at the corners of the tetragonal structure.

ii. After first generation, hybrid plants lose their characteristic property and do not maintain the hybrid nature The hybrid traits in the progeny will segregate and will not maintain the hybrid characters. Thus, the hybrid seeds have to be produced year after year .

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