Question

model 2 - the carbon cycle

1. model 2 illustrates how nature recycles what natural resource?
2. name two ways that carbon (usually in the form of co₂) enters the atmosphere.
3. process d on the diagram uses co₂ from the atmosphere.

a. label d on the diagram in model 2 with the name of this process.
b. what organisms carry out the process identified in part a?

1. wastes and dead organisms must be broken down in order for their components to be used again.

a. what organisms in the cycle carry out this process?
b. what would happen if decomposition did not occur?

Explanation:

1. The diagram is titled "The Carbon Cycle" and shows the movement of carbon in nature, so the natural resource is carbon.
2. The diagram shows auto and factory emissions (combustion) and respiration as ways carbon - in the form of CO₂ enters the atmosphere.

13a. The process that uses CO₂ from the atmosphere is photosynthesis.
13b. Plants carry out photosynthesis.
14a. Decomposing fungi, bacteria, and worms break down wastes and dead organisms.
14b. If decomposition did not occur, nutrients would not be recycled, and dead organisms and wastes would accumulate, and the carbon cycle would be disrupted.

Answer:

1. Carbon
2. Combustion (auto and factory emissions), Respiration

13a. Photosynthesis
13b. Plants
14a. Decomposing fungi, bacteria, and worms
14b. Nutrients would not be recycled, dead organisms and wastes would accumulate, and the carbon cycle would be disrupted.