Question

After growing leguminous plants, the soil becomes rich in –
a. Phosphorus b. Oxygen c. potassium d. Nitrogen

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Answer 1

Answer:

(d)

Explanation:

After growing leguminous plants, the soil becomes rich in Nitrogen.

Answer 2

Answer:

(d) Nitrogen

Leguminous plants have 'Nif gene' which produces the chemical 'flavanoid', that attracts the 'Rhizobium' bacteria. When the bacteria invades the plant's roots, it forms nodules. The 'nif gene' gets activated and produces 'Leg-haemoglobin'. This absorbs the free Oxygen to form 'Leg-oxyhaemoglobin'. After absorbing the free oxygen, it produces a 'free-oxygen free zone'. The Nitrogenase enzyme in Rhizobium only activates when there is no oxygen. So, it gets activated and this enzyme fixes the atmospheric nitrogen into nitrites and nitrates in the soil, which can eventually be absorbed by the plant's roots...

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