Question

Choose the correct statement from the following:

• A. Cleistogamous flowers always exhibit autogamy
• B. Chasmogamous flowers always exhibit geitonogamy
• C. Cleistogamous flowers exhibit both autogamy and geitonogamy
• D. Chasmogamous flowers never exhibit autogamy

Hint:

{Cleistogamy} assures seed set even in the absence of pollinators. Examples: {Viola} (Common pansy), {Oxalis}, and {Commelina}.

Answer 1

The Correct Option is A

Step 1: Define Flower Types:

• Cleistogamous flowers: These flowers do not open at all. Their reproductive organs are enclosed.
• Chasmogamous flowers: These are open flowers with exposed anthers and stigma.

Step 2: Analyze Pollination Types:
Since Cleistogamous flowers never open, cross-pollination (xenogamy) or pollination from another flower on the same plant (geitonogamy) is physically impossible. The pollen from the anthers must land on the stigma of the \same flower. Therefore, they invariably exhibit autogamy (self-pollination).
Step 3: Analyze Other Options:
(B) Chasmogamous flowers can exhibit autogamy, geitonogamy, or xenogamy depending on the plant and pollinators.
(C) Cleistogamous flowers cannot exhibit geitonogamy because they are closed.
(D) Chasmogamous flowers \can exhibit autogamy (e.g., if pollen falls on the stigma of the same flower).
Step 4: Final Answer:
The correct statement is (A).