Legume plants are important for crop production, because they

Help in CO

_{2}

fixation

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Do not help in NO

_{2}

fixation

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Increase soil fertility

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All of the above

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Solution

The correct option is C Increase soil fertility
Plants cannot directly absorb atmospheric nitrogen, because in atmosphere it is present as stable diatomic form. Plants absorb nitrogen as nitrates, nitrites or ammonium ions. Legume plants have root nodule bacteria Rhizobium in their roots, which can fix atmospheric nitrogen into ammonium ions. Thus, legume plants increase nitrogen content of soil. This increases soil fertility.

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‘Jhuming’ used to be an important activity in the tribal regions of North East India. Consider the following statements regarding Jhuming :
1. It is an agricultural practice done in forests.
2. The crops are sown in the patches between the trees and no tree is cut.
3. Natural fertility of soil is used and no external fertilizer is added.
4. Because of natural fertility of soil the yield is usually very high.
Which of the above statement(s) is/are not correct?

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