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 :
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Answer: A. Nitrogen-fixing plants are mainly legumes, which host Rhizobium bacteria in root nodules. Alfalfa, chickpea and clover are legumes. Amaranth, purslane and spinach are not legumes and do not fix nitrogen. So 1, 3 and 4.
Watch for: Leafy greens are healthy and grow fast, but that does not make them nitrogen-fixers.
Why the other options are wrong
- B. Wrong because purslane and spinach do not fix nitrogen.
- C. Wrong because amaranth, purslane and spinach are not nitrogen-fixers.
- D. Wrong because amaranth, purslane and spinach are not nitrogen-fixers.
Source to check: NCERT Class 8 Science, Chapter 1 (Crop Production and Management); NCERT Class 11 Biology, Chapter 12 (Mineral Nutrition)
Answer from the official UPSC key. Written and fact-checked by AI against the official key. Spotted a mistake? Report it.