Question

question 20
what is the source of energy in the equation for cellular respiration?
a. carbon dioxide
b. the sun
c. sugar
d. water

Explanation:

To determine the source of energy in cellular respiration, we analyze each option:

• Option A: Carbon dioxide is a reactant in photosynthesis, not a source of energy in cellular respiration.
• Option B: The sun is the energy source for photosynthesis, not directly for cellular respiration.
• Option C: In cellular respiration, sugar (glucose) is broken down to release energy (ATP). So sugar is the source of energy here.
• Option D: Water is a reactant in photosynthesis and a by - product or reactant in some steps of cellular respiration, but not an energy source.

Answer:

C. sugar