Nitrogen is a major constituent of the atmosphere comprising about seventy nine per cent of the atmo...........

Geography and Environment (PCS) World climates

Nitrogen is a major constituent of the atmosphere comprising about seventy-nine per cent of the atmospheric gases. Consider the following about it.

1. It is an essential constituent of organic compounds such as the amino acids and protein.

2. The principal source of free nitrogen is the action of soil micro-organisms and associated plant roots on atmospheric nitrogen.

1 only

2 only

Both 1 and 2

None

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Explanation:

Statement 1: These organic compounds such as the amino acids, nucleic acids, proteins, vitamins and pigments.
Statement 2: Generally, nitrogen is usable only after it is fixed. Ninety per cent of fixed nitrogen is biological. Only a few types of organisms like certain species of soil bacteria and blue green algae are capable of utilising it directly in its gaseous form.