With respect to air, water, and material resources, which of the following is true?
A) A forest is a closed system.
B) A forest is an open system.
C) A forest is an open system in terms of air, but closed in terms of material resources.
D) A forest is an open system in terms of water, but closed in terms of energy resources.

Question

Quizplus · Accepted Answer

A forest is an open system because it exchanges matter and energy with its surroundings. It takes in carbon dioxide, water, and nutrients from the air and soil, and releases oxygen during photosynthesis. It also releases water vapor, volatile organic compounds, and other gases into the air. In addition, it receives energy from the sun and converts it into chemical energy through photosynthesis, and releases heat into the environment through respiration and decomposition. Thus, a forest is not a closed system.

With Respect to Air, Water, and Material Resources, Which of the Following