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NEET 2022, Biology Q21: Pre-Fertilisation : Structures and Events

NEET2022Biology
Q.

Given below are two statements :

Statement I :

Cleistogamous flowers are invariably autogamous

Statement II :

Cleistogamy is disadvantageous as there is no chance for cross pollination

In the light of the above statements, choose the correct answer from the options given below:

  1. A

    Both Statement I and Statement II are correct

  2. B

    Both Statement I and Statement II are incorrect

  3. C

    Statement I is correct but Statement II is incorrect

  4. D

    Statement I is incorrect but Statement II is correct

Solution

Cleistogamous flowers remain closed throughout development. Since pollen cannot escape the flower nor reach an outside stigma, fertilisation is necessarily by self-pollen, that is, autogamy. So Statement I is correct.

Because pollinators are excluded and cross pollination is impossible, cleistogamous plants forfeit the genetic mixing that cross pollination provides. This is a clear genetic disadvantage. Statement II is also correct.

Concept behind this question

Pre-Fertilisation : Structures and EventsNotes, formulas and examples →

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