Question

which statement about biogeochemical cycles is true?
a. plants are a part of the water and nitrogen cycles, but not the carbon cycle.
b. plants are a part of the nitrogen, carbon, and water cycles.
c. plants are a part of the nitrogen and carbon cycles, but not the water cycle.
d. plants are a part of the water and carbon cycles, but not the nitrogen cycle.

Explanation:

Plants take up water through roots (water - cycle), fix carbon dioxide during photosynthesis (carbon - cycle), and take up nitrogen in the form of nitrates (nitrogen - cycle).

Answer:

B. Plants are a part of the nitrogen, carbon, and water cycles.