The chasmogamy in plants is best described as-

Q.102

ICAR AIEEA PG 2024 - Plant Sciences

MCQ (Single Correct) +4 −1

पौधों में चैस्मोगैमी (Chasmogamy / उन्मील परागण) का सबसे अच्छा वर्णन किस रूप में किया जाता है?

The condition in which flowers remain closed during the day and open at night वह स्थिति जिसमें फूल दिन में बंद रहते हैं और रात में खुलते हैं The condition in which flowers open only after they have been pollinated वह स्थिति जिसमें फूल परागित होने के बाद ही खुलते हैं Correct The condition in which flowers fail to open and misses self pollination वह स्थिति जिसमें फूल खुलने में विफल रहते हैं और स्व-परागण छूट जाता है The condition in which flowers are pollinated by wind instead of insects वह स्थिति जिसमें फूलों का परागण कीटों के बजाय हवा द्वारा होता है

Chasmogamy and Floral Biology in Crop Plants:

Cleistogamy: Flowers never open, strictly ensuring 100% self-pollination within closed petals (e.g., Commelina, subterranean flowers of peanut).
Chasmogamy: Flowers open exposing their reproductive organs to the atmosphere.
In many autogamous field crops (such as wheat, barley, and rice), anthesis exhibits a specialized chasmogamous behavior where anthers dehisce and self-pollinate the stigma while the glumes/florets are still closed, and flowers open only after self-pollination has already occurred (preventing outcrossing while allowing exhausted anthers to be extruded).
Official Answer Key: Option 2 represents the accepted NTA definition in agricultural crop breeding context.

Correct Answer: Option 2.

विस्तृत व्याख्या:

Chasmogamy and Floral Biology in Crop Plants (चैस्मोगैमी एवं पुष्प कार्यिकी):

Cleistogamy (क्लिस्टोगैमी / अनुन्मील परागण): Flowers never open, strictly ensuring 100% self-pollination within closed petals (e.g., Commelina, subterranean flowers of peanut).
Chasmogamy (चैस्मोगैमी / उन्मील परागण): Flowers open exposing their reproductive organs to the atmosphere.
In many autogamous field crops (such as wheat, barley, and rice), anthesis exhibits a specialized chasmogamous behavior where anthers dehisce and self-pollinate the stigma while the glumes/florets are still closed, and flowers open only after self-pollination has already occurred (preventing outcrossing while allowing exhausted anthers to be extruded).
Official Answer Key: Option 2 represents the accepted NTA definition in agricultural crop breeding context.

Correct Answer: Option 2.

Explanation not matching this question? क्या व्याख्या इस प्रश्न से मेल नहीं खा रही? Report

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