Question

class
lesson review
date
cellular respiration
choose the best answer to each question.

1. what two compounds do organisms release as their cells break down food to obtain energy?

a. oxygen and water
b. sugar and carbon dioxide
c. carbon dioxide and water
d. sugar and water

Explanation:

To solve this, we recall the cellular respiration equation: Glucose (sugar) and oxygen are used, and carbon dioxide and water are released as by - products while energy is obtained. Let's analyze each option:

• Option A: Oxygen is a reactant, not a product of energy - releasing breakdown, so A is wrong.
• Option B: Sugar is a reactant, not a product of the breakdown for energy, so B is wrong.
• Option C: Carbon dioxide and water are the by - products of cellular respiration (when cells break down food to get energy), so this option is correct.
• Option D: Sugar is a reactant, not a product of the energy - releasing process, so D is wrong.

Answer:

C. carbon dioxide and water