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 :
(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*
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Explanation:
Option A is correct: Rhizobium is 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 so do not nitrogen fixing mechanism. Spinach is a leaf plant, it consumes nitrogen, it doesn’t fix nitrogen. So #6 is wrong, Therefore by elimination the answer is A.