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Question
What is the function of the pollen tube? Explain it with the help of a diagram.
Solution
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 the micropyle.
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RELATED QUESTIONS
(a) Explain the events after pollination leading to the formation of a seed in angiosperms.
(b) Mention the ploidy levels of the cells of different parts of an albuminous seed.
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 |
Given ahead is a diagrammatic sketch of the sectional view of a germinating pollen grain. Study the same and then answer the question that follows:
Name the parts labelled 1, 2, 3, 4 and 5.
What happens to the ovary post fertilization?
The question has four options. Choose the correct answer:
One male gamete fuses with the egg and forms a diploid zygote. This process is called
Identify the incorrect pair
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
The success of seed plants on land is mainly due to ______.
Identify the CORRECT statement with reference to cellular endosperm.
The total number of nuclei involved in double fertilisation in angiospersm are ______.
