Question
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:
Correct Answer — A
Explanation
Correct answer: (a) 1, 3 and 4 only
Alfalfa, Chickpea and Clover are all leguminous plants that form mutualistic root-nodule symbioses with soil rhizobia bacteria, fixing atmospheric nitrogen. Amaranth, Purslane and Spinach are non-leguminous greens that simply absorb soil nitrates rather than fixing nitrogen themselves.