Question

question 1-2
which statement most accurately describes chemical compounds produced by photosynthesis and respiration?

• photosynthesis produces water, while respiration produces carbon dioxide.
• photosynthesis produces carbon dioxide, while respiration produces oxygen.
• photosynthesis produces oxygen, while respiration produces glucose.
• photosynthesis produces oxygen, while respiration produces carbon dioxide.

Explanation:

To solve this, recall the processes of photosynthesis and respiration:

• Photosynthesis (in plants/algae): Uses \( \ce{CO_2} \), water, and light to produce glucose (\( \ce{C_6H_{12}O_6} \)) and oxygen (\( \ce{O_2} \)).
• Cellular Respiration (in cells): Uses glucose and oxygen to produce \( \ce{CO_2} \), water, and energy.

Now analyze each option:

1. "Photosynthesis produces water, while respiration produces carbon dioxide." → Incorrect. Photosynthesis uses water, respiration produces \( \ce{CO_2} \), but the first part is wrong.
2. "Photosynthesis produces carbon dioxide, while respiration produces oxygen." → Incorrect. Photosynthesis uses \( \ce{CO_2} \), respiration uses oxygen.
3. "Photosynthesis produces oxygen, while respiration produces glucose." → Incorrect. Respiration uses glucose, not produce it.
4. "Photosynthesis produces oxygen, while respiration produces carbon dioxide." → Correct. Matches the products of each process.

Answer:

The correct option is: "Photosynthesis produces oxygen, while respiration produces carbon dioxide." (the fourth option in the list)