Given below are two statements
Statement (I) : Sesbania is used as green manure crop.
Statement (II) : In Sesbania, nodules are formed only on the roots.
In light of the above statements, choose the most appropriate answer from the options given below:
नीचे दो कथन दिए गए हैं
कथन (I) : सेस्बेनिया (Sesbania / ढैंचा) का उपयोग हरी खाद की फसल के रूप में किया जाता है।
कथन (II) : सेस्बेनिया में ग्रंथियां (nodules) केवल जड़ों पर बनती हैं।
उपरोक्त कथनों के आलोक में, नीचे दिए गए विकल्पों में से सबसे उपयुक्त उत्तर चुनिए:
Sesbania Green Manuring and Nodulation:
- Statement (I) is CORRECT: Sesbania aculeata (Dhaincha) and Sesbania rostrata are leading leguminous green manure crops grown widely in wetland rice cropping systems to accumulate 80–120 kg N/ha and improve soil physical structure.
- Statement (II) is INCORRECT: In Sesbania rostrata, nitrogen-fixing nodules develop profusion on both the stems and the roots via symbiosis with the photosynthetic stem-nodulating rhizobacterium Azorhizobium caulinodans. Stem nodulation enables continued nitrogen fixation even under completely submerged/waterlogged wetland conditions where root nodulation is oxygen-restricted.
Therefore, Statement (I) is correct but Statement (II) is incorrect.
Correct Answer: Option 3.
विस्तृत व्याख्या:
Sesbania Green Manuring and Nodulation (ढैंचा में ग्रंथिकरण एवं हरी खाद):
- Statement (I) is CORRECT: Sesbania aculeata (Dhaincha) and Sesbania rostrata are leading leguminous green manure crops grown widely in wetland rice cropping systems to accumulate 80–120 kg N/ha and improve soil physical structure.
- Statement (II) is INCORRECT: In Sesbania rostrata, nitrogen-fixing nodules develop profusion on both the stems and the roots via symbiosis with the photosynthetic stem-nodulating rhizobacterium Azorhizobium caulinodans. Stem nodulation enables continued nitrogen fixation even under completely submerged/waterlogged wetland conditions where root nodulation is oxygen-restricted.
Therefore, Statement (I) is correct but Statement (II) is incorrect.
Correct Answer: Option 3.
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