Question:
Identify the mechanism of promoting self-pollination in the following?
Identify the mechanism of promoting self-pollination in the following?
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Cleistogamy = "Closed marriage." Flowers stay closed, forcing selfing. It is common in plants like Commelina and some forest herbs.
Updated On: Aug 7, 2026
- Dichogamy
- Male sterility
- Cleistogamy
- Self-incompatibility
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify a biological mechanism in plants that ensures or forces self-pollination (autogamy) instead of cross-pollination.
Detailed Explanation:
• Plants have evolved various mechanisms to either promote outcrossing or ensure selfing.
• Cleistogamy is a condition where flowers never open. Since the reproductive organs are enclosed within the bud throughout their functional life, self-pollination is the only possibility.
• This is a fail-safe mechanism for seed production, especially under unfavorable environmental conditions where pollinators might be absent.
• Analysis of other options (Cross-pollination promoters):
- Dichogamy: Stamen and Stigma mature at different times (e.g., Protandry/Protogyny).
- Male sterility: The plant cannot produce functional pollen, forcing it to accept foreign pollen.
- Self-incompatibility: A genetic mechanism that prevents a plant's own pollen from fertilizing its own ovules.
Step 2: Final Answer:
Cleistogamy is the mechanism that promotes self-pollination.
The question asks to identify a biological mechanism in plants that ensures or forces self-pollination (autogamy) instead of cross-pollination.
Detailed Explanation:
• Plants have evolved various mechanisms to either promote outcrossing or ensure selfing.
• Cleistogamy is a condition where flowers never open. Since the reproductive organs are enclosed within the bud throughout their functional life, self-pollination is the only possibility.
• This is a fail-safe mechanism for seed production, especially under unfavorable environmental conditions where pollinators might be absent.
• Analysis of other options (Cross-pollination promoters):
- Dichogamy: Stamen and Stigma mature at different times (e.g., Protandry/Protogyny).
- Male sterility: The plant cannot produce functional pollen, forcing it to accept foreign pollen.
- Self-incompatibility: A genetic mechanism that prevents a plant's own pollen from fertilizing its own ovules.
Step 2: Final Answer:
Cleistogamy is the mechanism that promotes self-pollination.
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