Question

3.1.9-12.g the overall reactions for photosynthesis and cellular respiration are opposite of each other. select two statements that describe the two processes.

□ photosynthesis uses carbon dioxide from the atmosphere and produces oxygen.

□ photosynthesis uses oxygen to release energy from food and produces carbon dioxide as a by - product.

□ cellular respiration uses oxygen to release energy from food and produces carbon dioxide as a by - product.

Explanation:

1. Analyze the first statement: Photosynthesis in plants takes in \( \text{CO}_2 \) (carbon dioxide) from the atmosphere and, through the process, releases \( \text{O}_2 \) (oxygen). This is correct for photosynthesis.
2. Analyze the second statement: The process described here is cellular respiration, not photosynthesis. Photosynthesis does not use oxygen to release energy from food; that's respiration. So this statement is incorrect.
3. Analyze the third statement: Cellular respiration uses oxygen to break down food (like glucose) to release energy, and carbon dioxide is a by - product. This is correct for cellular respiration.

Since the two processes (photosynthesis and cellular respiration) are opposites, the correct statements are the first (about photosynthesis) and the third (about cellular respiration).

Answer:

• Photosynthesis uses carbon dioxide from the atmosphere and produces oxygen.
• Cellular respiration uses oxygen to release energy from food and produces carbon dioxide as a by - product.