Question

Assertion (A): The amount of carbon dioxide in the atmosphere remained constant in the past.

Reason (R): Plants absorbed carbon dioxide during photosynthesis and give out oxygen, balancing the amount of carbon dioxide produced by natural processes.

Options

• Both A and R are true, and R is the correct explanation of A.

• Both A and R are true, but R is not the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.

Answer 1

Both A and R are true, and R is the correct explanation of A.

Explanation:

The concentration of atmospheric carbon dioxide remained balanced because natural carbon sinks, such as plants through photosynthesis, effectively offset the carbon dioxide released by natural geological and biological processes.