Civil Services Prep

Prelims 2022 · Environment · Question 48

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:

  1. 1, 3 and 4 only
  2. 1, 3, 5 and 6 only
  3. 2, 4, 5 and 6 only
  4. 1, 2, 4, 5 and 6

Answer

1, 3 and 4 only

1. Alfalfa – A leguminous fodder crop; forms symbiosis with Rhizobium and fixes atmospheric nitrogen. Correct.

2. Amaranth – Not a legume and not known as a nitrogen-fixing plant. Incorrect.

3. Chickpea – A pulse/legume; root nodules with Rhizobium fix nitrogen. Correct.

4. Clover – A leguminous plant commonly used in crop rotation for nitrogen fixation. Correct.

5. Purslane (Kulfa) – Not a legume; not a nitrogen-fixing plant. Incorrect.

6. Spinach – Leafy vegetable, non-leguminous, does not fix nitrogen. Incorrect.

Thus, the nitrogen-fixing plants are 1, 3 and 4 only.

  1. Consider the following statements with reference to India's response to climate change : I. India's Long-Term…
  2. With respect to the Western Hoolock Gibbons, which of the following statements is/are correct? 1. A Sanctuary…
  3. Which of the following best explain(s) the rationale for protecting mangrove ecosystems in the context of…
  4. Which of the following statements with regard to the arrival of Amur Falcons at Doyang Lake in Nagaland each…
  5. With reference to Madhav National Park, which of the following statements is/are correct ? 1. It was declared…
  6. Consider the following statements about Rhynchostylis retusa (Foxtail orchid) : 1. It is an epiphytic orchid.…