Question

question 7 (multiple choice worth 1 point) tg.02 the diagram below shows two processes, p and q, in the carbon cycle. carbon in atmosphere → plant → p → coal; coal → q → carbon in atmosphere. which of these statements best describes the processes p and q? p represents diffusion and q represents evaporation. p represents evaporation and q represents diffusion. p represents combustion and q represents decomposition. p represents decomposition and q represents combustion.

Explanation:

1. Analyze process P: The arrow goes from the plant to coal. In the carbon cycle, plants (after death) undergo decomposition over time to form fossil fuels like coal. So P is decomposition.
2. Analyze process Q: The arrow goes from coal to carbon in the atmosphere. Burning (combustion) of coal releases carbon dioxide (carbon) into the atmosphere. So Q is combustion.
3. Check options: The option "P represents decomposition and Q represents combustion" matches this analysis. Other options: Diffusion and evaporation are not related to plant - coal - atmosphere carbon cycle steps here; combustion and decomposition were misassigned in other options.

Answer:

D. P represents decomposition and Q represents combustion (assuming the last option is labeled D; if the original labels were different, adjust the label but the text is "P represents decomposition and Q represents combustion")