Question

which statement correctly describes the diagram? a the products of photosynthesis cannot be used by other organisms. b the products of respiration can be used by plants for photosynthesis. c the exchange of oxygen and carbon dioxide occurs only in respiration. d the exchange of oxygen and carbon dioxide occurs only in photosynthesis.

Explanation:

Photosynthesis (plants/algae/bacteria) produces O₂ and sugars; respiration (most organisms) produces H₂O and CO₂. The diagram shows a cycle where respiration's products (H₂O, CO₂) are inputs for photosynthesis.

Option A is incorrect: sugars from photosynthesis are used by other organisms.
Option B is correct: respiration's products (H₂O, CO₂) are reactants for photosynthesis.
Options C and D are incorrect: O₂/CO₂ exchange occurs in both processes (photosynthesis: takes CO₂, releases O₂; respiration: takes O₂, releases CO₂).

Answer:

B. The products of respiration can be used by plants for photosynthesis.