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Question

Anthesis is absent in cleistogamy because?


A

No pollination is required.

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B

It allows xenogamy.

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C

It assures heterozygosity.

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D

It favors insect pollination.

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Solution

The correct option is A

No pollination is required.


The correct option is A.

Explanation of correct option:

  1. Anthesis refers to the period when a flower is open and functional.
  2. Cleistogamy is a type of self-pollination which is observed in cleistogamous flowers.
  3. Cleistogamous flowers always remain closed. In this type of flower, stigma and anthers are close to each other and cross-pollination is no way possible.
  4. Anthesis is absent in cleistogamy since no pollination is required for cleistogamous flowers.

Explanation of incorrect option:

Option B:

  1. In xenogamy, pollen grains are transferred from the anther to the stigma of a completely different plant.
  2. Cleistogamy doesn’t allow xenogamy because it is a self-pollination process.

Option C:

  1. Heterozygosity is mostly observed in plants that undergo cross-pollination.
  2. Cleistogamy increases homozygosity since it doesn’t allow cross-pollination.

Option D:

  1. Insect pollinators help in transferring pollen grains from one plant to another plant.
  2. Cleistogamy does not favor insect pollination since the flower doesn’t open at all.

Final answer: Anthesis is absent in cleistogamy because no pollination is required.


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