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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 ?

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

Role of tapetum in pollen grain wall formation

During microsporogenesis, the cells of tapetum provide various enzymes, hormones, amino acids and other nutritive materials to the dividing microsporocytes.

The main functions of tapetum are :

1. Transportation of nutrients into inner side of anther.

2. Secretion of enzymes and hormones.

3. It helps in the formation of exine which is composed of sporopollenin.

4. It provides nutrition to the developing pollen grain.

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