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Sexual Reproduction in flowering Plants

Long Answer Type

61.

Give a labelled diagram showing

A. Enlarged view of an egg apparatus showing entry of pollen tube into a synergid.
B. Discharge of male gametes into a synergid and the movements of the sperms, one into the egg and the other into the central cell

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Short Answer Type

62. Why is endosperm in angiospermic ovule considered as more efficient ?

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63. What are main functions of fruits ?

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64. Explain the biological and economic importance of fruits.

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65. What is fate of following in a mature fruits ?
(a) Integument (b) Ovary wall (c) Egg cell (d) Secondary nucleus (e) Antipodal cells.

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Long Answer Type

66. Differentiate

(a) hypocotyl and epicotyl

(b) Coleoptile and coleorhiza

(d) Perisperm and pericarp.

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Short Answer Type

67. Why is apple called a false fruit ? Which part of flower form its fruit ?

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68. If one can induce parthenocarpy, through the application of growth substances, which fruits you would select to induce parthenocarpy and why ?

Parthenocarpy can be induced by applying growth hormones in order to get seedless fruits.

Oranges, lemon , water melon , grapes and guavas are certain economically important fruits which can be grown by inducing parthenocarpy using growth hormones to obtain seedless fruits without fertilization.

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69. Explain the role of tapetum in the pollen grain wall formation.

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70. What is apomixis ? Write its importance.

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