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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
Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.
Define the term Pollinating.
Can a unisexual flower be self pollinated?
Can a plant flowering in Mumbai be pollinated by pollen grains of the same species growing in New Delhi? Provide explanations to your answer.
Put a tick mark (✓) against the correct alternative in the following statements
Vegetative propagation is not observed in:
Both chasmogamous and cleistogamous flowers are present in ______.
Which of these is a condition that makes flowers invariably autogamous?
In some plants anther and stigma mature at the same time this condition is called ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
Which one of the following may require pollinators, but is genetically similar to autogamy?
