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UPSC Prelims 2022 Paper-1 📅 05 Jun, 2022

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
(a) 1, 3 and 4 only
B
(b) 1, 3, 5 and 6 only
C
(c) 2, 4, 5 and 6 only
D
(d) 1, 2, 4, 5 and 6
Result Summary
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UPSC Prelims
2022 • 05 Jun, 2022 • Paper-1
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) 1, 3 and 4 only
Botanical Mechanism: Nitrogen-fixing plants form a vital symbiotic relationship with Rhizobium bacteria in their root nodules, allowing them to naturally conver......
Ref/Book : UPSC Prelims 2022
Ref. Subject Environment
Chapter -
Ref. Topic Botany
Pg. No -
💡 Analysis & Explanation
Botanical Mechanism ▼
Nitrogen-fixing plants form a vital symbiotic relationship with Rhizobium bacteria in their root nodules, allowing them to naturally convert inert atmospheric nitrogen into usable biological forms. This trait is overwhelmingly associated with the Fabaceae (legume) family.
Species Analysis ▼
Alfalfa (1), Chickpea (3), and Clover (4) are classic leguminous plants well-known in agriculture for enriching soil nitrogen. Conversely, Amaranth (2), Purslane (5), and Spinach (6) belong to entirely different botanical families and completely lack this specific root nodule mechanism.
Conclusion ▼
Thus, only options 1, 3, and 4 possess this ecological capability.
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