Question 20

Question

A cell in the leaf of a green plant performs both photosynthesis and cellular respiration, often at the same time. Which statement best describes how these processes are related to each other?
• a Thermal energy from one process is used as the primary energy source for the other process.
• b Both processes require energy directly from the Sun.
• c Both processes produce carbon dioxide
• d
Products of one process are used as some of the reactants for the other process.

Answer 1

The best statement that describes the relationship between photosynthesis and cellular respiration is:

d. Products of one process are used as some of the reactants for the other process.

In photosynthesis, plants convert carbon dioxide and water into glucose and oxygen using sunlight. In cellular respiration, the glucose and oxygen produced during photosynthesis are used to produce energy, carbon dioxide, and water. Thus, the products of photosynthesis are the reactants for cellular respiration, and vice versa.