A
1 and 2 only
B
2 and 3 only
C
3 only
D
1, 2 and 3
Correct answer: (d) 1, 2 and 3
Explanation
- A
1 and 2 only
1 and 2 only. Soil carbon also holds.
- B
2 and 3 only
2 and 3 only. Wheat after rice without burning also holds.
- C
3 only
3 only. Under-counts.
- D
1, 2 and 3
All three. Wheat into rice residue without burning; wet direct-seeded rice without a nursery; carbon left in the soil.
Summary. Official key is (d) 1, 2 and 3. Zero tillage lets wheat go in without burning paddy stubble, allows direct-seeded rice, and keeps carbon in the soil.
PYQ trend
When UPSC asked this
Related PYQs from other years, newest first. Open a question to read it.
-
2022 · Q40 · General Studies · 2 marks
If a major solar storm (solar-flare) reaches the Earth, which of the following are the possible effects on the Earth? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. 7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. Select the correct answer using the code given below: -
2020 · Q90 · General Studies · 2 marks
In the context of India, which of the following is/are considered to be practice(s) of eco-friendly agriculture? 1. Crop diversification 2. Legume intensification 3. Tensiometer use 4. Vertical farming Select the correct answer using the code given below: -
2020 · Q91 · General Studies · 2 marks
What are the advantages of fertigation in agriculture? 1. Controlling the alkalinity of irrigation water is possible. 2. Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible. 3. Increased availability of nutrients to plants is possible. 4. Reduction in the leaching of chemical nutrients is possible. Select the correct answer using the code given below: -
2017 · Q45 · General Studies · 2 marks
With reference to agriculture in India, how can the technique of 'genome sequencing', often seen in the news, be used in the immediate future? 1. Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants. 2. This technique helps in reducing the time required to develop new varieties of crop plants. 3. It can be used to decipher the host-pathogen relationships in crops. Select the correct answer using the code given below: