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Question

Which of the following describes geitonogamy?


A

Fertilization of a flower by the pollen from the same flower

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B

Fertilization of a flower by the pollen from another flower of the same plant

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C

Fertilization of a flower by the pollen from a flower of another plant belonging to a distant population

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D

Fertilization of a flower by the pollen from a flower of another plant in the same population

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Solution

The correct option is B

Fertilization of a flower by the pollen from another flower of the same plant


The correct option is B.

Explanation of correct option:

  1. Geitonogamy is the transfer of pollen grains from one flower's anther to the stigma of another flower on the same plant by a pollinator.
  2. It is a self-pollination process.
  3. For example, maize.

Explanation of incorrect options:

Option A:

  1. Autogamy is the fertilization of a flower by pollen from the same flower.
  2. It is also a self-pollination process.
  3. For example, wheat, rice, etc.
  4. Generally happens in closed flowers like cleistogamous flowers that do not require a pollination agent to pollinate.

Option C:

  1. Xenogamy is the transfer of pollen from one flower to another flower of a different plant.
  2. It is a cross-pollination process.
  3. For example, broccoli, squash, etc.

Option D:

  1. Fertilization of a flower by the pollen from a flower of another plant in the same population is also a cross-pollination process.
  2. For example, tomatoes, pumpkins, and apples.

Final Answer: Geitonogamy involves the fertilization of a flower by the pollen from another flower of the same plant.


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