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Answer:
Autogamy
It is a type of self-pollination where the transfer of pollen grains from the anther to the stigma takes place within the same flower. Opening and exposure of anther and stigma are necessary for autogamy. There are two conditions for autogamy to takes place:
Anther-stigma synchronization; when the pollen is released, stigma should be ready to receive it.
The position of or distance between anther and stigma. Both should be close enough for pollinations.
In chasmogamous flowers, anther and stigma are exposed. The exposed reproductive parts give a chance of cross-pollination in chasmogamous flowers. While in cleistogamous flowers anther and stigma are not exposed but lie close enough for transfer. Thus, the chances of cross-pollination in cleistogamous flowers are almost none. In addition, they barely require a pollinating agent.
Geitonogamy
Geitonogamy is the type of self-pollinations where the transfer of pollen grains from the anther to the stigma takes place between different flowers in the same plant. Though it seems like cross-pollination and takes place with the help of pollinator, both the gametes have the same plant as their origin.
Xenogamy
Xenogamy is the cross-pollination where the pollen grain transfer occurs across flowers of two different plants. In other words, the transfer of pollen from the anther of one plant to the stigma of another plant.
Each type has its own merits, like xenogamy, leads to a new variety whereas autogamy helps to preserve parental characters. Plants have various adaptations to accomplish this task. In addition, flowers depend on certain pollinating agents which can either be biotic or abiotic. These biotic and abiotic pollinating agents are collectively termed as pollinators
Answer:
Autogamy, or self-fertilization, refers to the fusion of two gametes that come from one individual. Autogamy is predominantly observed in the form of self-pollination, a reproductive mechanism employed by many flowering plants.Geitonogamy is the transfer of pollen from the anther of one flower to the stigma of another flower on the same plant. Xenogamy is the transfer of pollen from the anther of one flower of a plant to the stigma of another flower of a different plant.
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