Question

Which of the following were the characteristics of the prebiotic primitive Earth?
Characteristics:

1. A. Presence of \( \text{CO}_2 \)
2. B. Presence of \( \text{CH}_4 \)
3. C. Presence of \( \text{H}_2\text{O} \) vapour
4. D. Presence of \( \text{O}_2 \)

Choose the correct answer from the options given below:

• A. (A) and (D) only
• B. (A), (B), and (C) only
• C. (A), (B), and (D) only
• D. (B), (C), and (D) only

Hint:

The reducing atmosphere of primitive Earth played a crucial role in chemical evolution and the origin of life.

Answer 1

The Correct Option is B

The primitive, prebiotic Earth was defined by:

• An atmosphere comprising \( \text{CO}_2 \) (carbon dioxide), \( \text{CH}_4 \) (methane), and \( \text{H}_2\text{O} \) (water vapour).
• The lack of atmospheric \( \text{O}_2 \) (oxygen), indicating a reducing rather than oxidizing environment.