Question

Assertion :Chasmogamous flowers require pollinating agents. Reason: Cleistogamous flowers do not expose their sex organs.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Flowers, that open at maturity to facilitate exposure of pollen and stigma for cross pollination are referred to as chasmogamous flowers. Cross pollination is transfer of pollen from one plant to stigma of flower borne on different plant of same species. Therefore, chasmogamous flowers require pollinating agents to facilitate and ensure transfer of pollens. For example, wind, insect, water and animals serve as pollinating agents. The chasmogamous flowers are large, conspicuous colourful flowers with nectar/scent to attract pollinators. This makes Assertion correct. Flowers that remain close to avoid cross pollination and exhibit modifications to facilitate self pollination are referred to as cleistogamous flowers. They are small, bisexual, colourless flowers and do not secrete nectar; the adaptations to facilitate self pollination. Reason is correct.

Thus, the correct answer is option B.