[3 marks Question Answer]

Question 13 Marks

Match the items in Column A with those in Column B.

Column A	Column B
(a) Generative nucleus	(i) Pollen tube
(b) Germ pore	(ii) Endosperm nucleus
(c)Exine	(iii)Testa
(d) Secondary nucleus	(iv) Fertilization
(e) Integument	(v) Male nuclei
(f) Egg nucleus	(vi) Rough

Answer

Column A	Column B
(a) Generative nucleus	(i) Male nuclei
(b) Germ pore	(ii) Pollen tube
(c)Exine	(iii) Rough
(d) Secondary nucleus	(iv) Endosperm nucleus
(e) Integument	(v)Testa
(f) Egg nucleus	(vi) Fertilization

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Question 23 Marks

Describe the advantages and disadvantages of cross-pollination to the plant.

Answer

Advantages of cross-pollination:

The offspring are healthier.
The seeds produced are abundant and viable.
New varieties may be produced by cross-pollinating two different varieties of the same species.

Disadvantages of cross-pollination:

Pollination is not always certain.
The pollen has to be produced in large quantities.
The process is uneconomical for the plant because the flowers have to be large, colored, scented and have to produce nectar for attracting pollinating agents.

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Question 33 Marks

What is the function of the pollen tube? Explain it with the help of a diagram.

Answer

The pollen tube grows out of the pollen grains by breaking through its exine. The pollen tube grows through the stigma and style by dissolving these tissues with the help of enzymes and reaches the ovary, where it enters the ovule through a minute pore called themicropyle.

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BIOLOGY [3 marks Question Answer]

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