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प्रश्न
List the different types of pollination depending upon the source of pollen gain.
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उत्तर
Pollination is the process of transfer of pollen grains from anther to stigma.
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Depending on the source of pollen grains, pollination can be divided as follows:
- Autogamy - It is the transfer of pollen grains from anther to stigma of the same flower. Autogamy requires the anther and the stigma to lie close. It also requires synchrony in the pollen release and stigma receptivity. Plants like Viola and Oxalis produce two kinds of flowers: chasmogamous flowers (with exposed anther and stigma) and cleistogamous flowers (plants that do not open at all and in which only autogamy occurs).
- Geitonogamy - It is the transfer of pollen grains from the anther of one flower to the stigma of another flower in the same plant. Genetically, it is similar to autogamy, but it requires pollinating agents.
- Xenogamy - It is the transfer of pollen grains from the anther to the stigma of a different plant. Pollination causes genetically different pollen types to be brought to a plant.
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संबंधित प्रश्न
What is self-incompatibility?
Name of the part of the ovary which gives rise to:
Fruit ______
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
What are the adaptations which are required in self-pollinated plants?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Feathery stigma occurs in ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
What is ornithophily?
Mention any one example of the hydrophilous flower.
Name the pollinating agent of a flowering plant with large and coloured flowers with sticky stigma. State one characteristic feature of the pollen grains produced in such flowers.
