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प्रश्न
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:
Where does the germination of the pollen grain take place and how?
उत्तर
Germination of the pollen grain takes place only after it falls on the stigma of the same plant species. The pollen grain is stimulated to germinate due to the secretion of sugars by the stigma.
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संबंधित प्रश्न
What is triple fusion?
Why do you think the zygote is dormant for sometime in a fertilised ovule?
What is the function of the pollen tube? Explain it with the help of a diagram.
Match the following
| I) | External fertilization | i) | pollen grain |
| II) | Androecium | ii) | anther wall |
|
III) |
Male gametophyte | iii) | algae |
| IV) | Primary parietal layer | iv) | stamens |
Transmitting tissue is found in
‘Pollination in Gymnosperms is different from Angiosperms’ – Give reasons.
Double fertilization was first discovered by Nawaschin (1898) in ______.
Ovules fall off after fertilization.
What is the function of the two male gametes produced by each pollen grain in angiosperms?
Identity the part of embryo sac which takes part in formation of primary endosperm nucleus during fertlisation
