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प्रश्न
Explain the post-pollination events leading to seed production in angiosperms.
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उत्तर
Pollination is the process of transfer of pollen grains from anther to stigma.
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When the pollen grains fall on the stigma, the pollen tube enters one of the synergids and releases two male gametes.
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One of the male gametes moves towards the egg cell and fuses with it to form zygote.
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The other male gamete fuses with the two polar nuclei and forms the primary endosperm nucleus. This is termed as triple fusion.
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After the triple fusion, the central cell becomes the primary endosperm cell (PEC).
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The primary endosperm nucleus gives rise to endosperm, while the zygote develops into embryo.
- Seeds are the fertilised ovules that are developed inside a fruit.
- The integuments of ovules harden to form the seed coat, and the micropyle facilitates the entry of oxygen and water into the seed.
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संबंधित प्रश्न
Mention two strategies that evolved to prevent self-pollination in flowers.
Why does self-pollination not lead to seed formation in self-incompatible species?
Add a note on pollination mechanism in Salvia.
Name of the parts of the ovary which give rise to:
Fruit wall ______
Which of the following plant contain unisexual flower?
Pollination refers to the ______.
Autogamy can occur in a chasmogamous flower if ______.
What are the major abiotic factors that influence habitat?
Name the following:
Aquatic plants which are anemophilous.
Comparatively a large amount of pollen grains are wasted during ______.
