Multiple choice question XXIX — task. Science CBSE, Class 7.

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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 fertilisers during cultivation. Why?

1. Why do farmers cultivating pulse crops like green gram, bengal gram, and black gram typically avoid applying nitrogenous fertilizers?

Pulse crops have a symbiotic association with Rhizobium bacteria.
These crops are not dependent on nitrogen for growth.
Pulse crops obtain nitrogen from the atmosphere directly.
Nitrogenous fertilizers inhibit the growth of pulse crops.

2. What role does Rhizobium bacteria play in the cultivation of pulse crops?

Rhizobium bacteria convert atmospheric nitrogen into a soluble form in the soil.
Rhizobium bacteria enhance water absorption in pulse crop roots.
Rhizobium bacteria produce pesticides to protect pulse crops from pests.
Rhizobium bacteria promote flowering and fruiting in pulse crops.

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29. Multiple choice question XXIX

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