Question

Assuming the carbon cycle is a closed system, which of the following statements is true?

A. Mass and energy are conserved in the carbon cycle.

B. As population sizes increase, more carbon is produced.

C. When all the fossil fuels are used up, there will be no more carbon.

D. The Sun absorbs energy from the carbon cycle.

Answer 1

A is the only statement which can be considered true given the assumed conditions.

Answer 2

Answer: Option A

Explanation:

The closed system can be defined as the system in which there is a conservation of mass and energy. The amount of carbon during the whole carbon cycle remains constant.

This is the characteristic feature of closed system that the mass and energy of the whole system remains same and constant.

The amount or mass of carbon present in the atmosphere before the carbon cycle and after the carbon cycle remains same.