UPSC Prelims 2022 – Question 48

Q48. Which of the following are nitrogen-fixing plants?

1. Alfalfa
2. Amaranth
3. Chickpea
4. Clover
5. Purslane (Kulfa)
6. Spinach

Select the correct answer using the code given below:
a) 1, 3 and 4 only
b) 1, 3, 5 and 6 only
c) 2, 4, 5 and 6 only
d) 1, 2, 4, 5 and 6

Answer – A

• Nitrogen fixation is a chemical process by which molecular nitrogen (N2), with a strong triple covalent bond, in the air is converted into ammonia (NH3) or related nitrogenous compounds, typically in soil or aquatic systems but also in industry. Rhizobium is a rod-shaped nitrogen-fixing bacteria live symbiotically within the roots of several leguminous plants such as alfalfa, sweet clover, sweet pea, lentils etc.
• The amaranth plant is a grain and green crop plant, because it is not a pulse crop and do not nitrogen-fixing mechanism. The purslane plant is one of the few vegetables that are rich in omega-3 fatty acids, which are important to support healthy arteries and can help prevent strokes, heart attacks, and other forms of heart disease. It also does not have a nitrogen-fixing mechanism at the root zone.

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