Question

If CO₂ is absent in the atmosphere of earth, then

• A. Temperature will decrease
• B. Temperature will increase
• C. Plants will flourish well
• D. No effect

Answer 1

The correct option is A

Temperature will decrease

The total CO₂ concentration of the atmosphere is 0.03% and is balanced by respiration and photosynthesis.

The correct option is A.

Explanation of correct option:

1. CO₂ is one of the major greenhouse gases.
2. When a small fraction of the solar radiation is reflected by the earth, these greenhouse gases capture and do not let them go.
3. Thus, the temperature of the surface increases.
4. But if the concentration of CO₂ decreases, the temperature of the earth will decrease.

Explanation of incorrect options:

Option B:

Temperature increases if CO₂ concentration increases.

Option C:

Plants won't flourish well as they require CO₂ for the process of photosynthesis.

Final answer: If CO₂ is absent in the atmosphere of the earth, then the temperature will decrease.