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प्रश्न
What are the possible types of pollinations in chasmogamous flowers. Give reasons.
उत्तर
There are two types of pollinations (chasmogamy) in chasmogamous flowers, i.e., self-pollination and cross-pollination.
- Self-pollination(Autogamy) The transfer of pollen grains from another to stigma of the same flower is called self-pollination. It is found in both cleistogamous and chasmogamous flowers.
- Cross-pollination (Allogamy) The transfer of pollen grains from anther to the stigma of another flower is called cross-pollination. It is of two types
- Geitonogamy it is the transfer of pollen from another to the stigma of another flower of the same plant. It is functionally a type of cross-pollination involving a pollination agent, genetically. It is similar to autogamy.
- Xenogamy The transfer of pollen grains from the flower of one plant to the stigma of another plant. This is the only type of pollination, which brings genetically different types of pollen grains to the stigma.
Showing self-pollination and cross-pollination
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संबंधित प्रश्न
Give advantages of self-pollination.
Define pollination.
Explain the methods of pollination.
Define – Pollination.
Assertion: Pollination and fertilization in flowers produce fruits and seeds.
Reason: After fertilization the ovary becomes fruit and ovule becomes seed.
Anemophilous flowers have ______.
Self-pollination means ______.
List three strategies that a bisexual chasmogamous flower can evolve to prevent self pollination (autogamy).
Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest the method of pollination in such plants.
Distinguish between autogamy and xenogamy.
