Nitrogen Fixation Nitrogen is an essential …

Nitrogen Fixation Nitrogen is an essential nutrient for plant growth. But farmers who cultivate pulse crops like green gram, bengal gram, black gram. etc. do not apply nitrogenous fertilizers during cultivation. Infact swollen structures can be seen in their roots. The legume looks healthy in presence of these structures and shows no symptoms of any disease. The soil too gets enriched after legume cultivation. QI . What must be these swollen structures? Q2. There is no need to apply urea on legumes.(Agree/Disagree) Q3. Comment on how these structures/organisms might be helpful to the legumes. i . Colonies of Rhizobia fix nitrogen into nitrates. (YES/NO) ii. Colonies of Rhizobia fix nitrates into ammonia.(YES/NO) iii. Colonies of Rhizobia make food for the legumes.(YES/NO) iv. Colonies of Rhizobia make water available for legumes to photosynthesise. (Y ES/NO) Q4. Do you think such relationships are successful? (YES/NO)

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