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 \textit{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 \textit{can} exhibit autogamy (e.g., if pollen falls on the stigma of the same flower).
Step 4: Final Answer:
The correct statement is (A).