2026 · Q32
Which of the following statements related to the stages of evolution of the present atmosphere are correct?
- 1The first stage is marked by the loss of primordial atmosphere
- 2In the second stage, the hot interior of the earth contributed to the evolution of the atmosphere
- 3Finally, the composition of the atmosphere was modified by the living world through the process of photosynthesis Select the answer using the code given below:
General KnowledgeGeography
- A1 and 2 only
- B1 and 3 only
- C2 and 3 only
- D1, 2 and 3
Explanation
All three stages are correct as per NCERT: first, the primordial atmosphere of hydrogen and helium was stripped away by solar winds; second, degassing from Earth's hot interior contributed gases that formed the early atmosphere; finally, photosynthesis by the living world modified its composition, enriching it with oxygen. The answer is (D) 1, 2 and 3.