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?

Question

a
Products of one process are used as some of the reactants for the other process.
b
Both processes produce carbon dioxide.
c
Thermal energy from one process is used as the primary energy source for the other process.
d
Both processes require energy directly from the Sun.

Answer 1

The correct answer is:

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

In photosynthesis, carbon dioxide and water are converted into glucose and oxygen using sunlight. In cellular respiration, glucose and oxygen are used to produce carbon dioxide, water, and energy (ATP). Thus, the products of photosynthesis (glucose and oxygen) are the reactants in cellular respiration, and vice versa for the byproducts.