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Question

The leguminous plants are important in agriculture because
  1. They need very little water to grow.
  2. Six crops of leguminous plants are harvested in a year.
  3. They are disease resistant.
  4. They help in nitrogen economy of the plants.

A
They are disease resistant.
B
They help in nitrogen economy of the plants.
C
They need very little water to grow.
D
Six crops of leguminous plants are harvested in a year.
Solution
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The roots of the leguminous plants are known to have symbiotic association with the microbes of species Rhizobium. These bacteria possess the enzyme nitrogenase which helps in the fixation of atmospheric nitrogen to nitrates. The increase in the concentration of the nitrates in the soil increases the nitrogen content in the plants
So, the correct answer is 'They help in nitrogen economy of the plants'

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