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Question

Transfer of pollen to the stigma of another flower of the same plant is
  1. Autogamy
  2. Allogamy
  3. Xenogamy
  4. Geitonogamy

A
Autogamy
B
Geitonogamy
C
Allogamy
D
Xenogamy
Solution
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The transfer of pollen grain from the anther to the stigma of a pistil is called pollination. It is a mechanism by which non-motile male and female gametes are brought together for the fertilization.
Pollination in which pollen grains from the anther fuse with the stigma of the same flower or with the stigma of another flower but of the same plant is called self- pollination.
Self- Pollination is of two types: Autogamy and geitonogamy. The transfer of pollen grains from the anther of one flower to the stigma of another flower of the same plant is called geitonogamy. This transfer involves an agent of pollination. Genetically, it is similar to autogamy since the pollen grains come from the same plant. Hence, option D is the correct answer.

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