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Question

Describe two phenomenons which can prevent both autogamy and geitonogamy and ensure xenogamy in flowering plants.

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Solution

1) Autogamy- is the transfer of pollen grains from the anther to the stigma of the same flower.
2) Geitonogamy- is the transfer of pollen grains from the anther to the stigma of another flower of the same plant.
  • Production of unisexual flowers i.e the male and female parts are present on different plants (dioecious) or on different flowers in the same plant (monoecious).
  • Both these methods prevent autogamy and geitonogamy.
3) Xenogamy is the transfer of pollen grains from the anther to the stigma of a different plant.
  • It is the type of pollination which brings genetically different types of pollen grains to the stigma and brings genetic variations.


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