Do plants require carbon dioxide (\(\mathrm{CO_2}\)) for the process of photosynthesis?

• A. No, plants use only oxygen for photosynthesis.
• B. No, plants can perform photosynthesis without any gases.
• C. Yes, carbon dioxide is essential for photosynthesis.
• D. Yes, but only at night.

Answer: (C)

Verified step by step guidance

1. Understand the process of photosynthesis: Photosynthesis is the process by which plants convert light energy into chemical energy stored in glucose. This process requires specific reactants, including carbon dioxide (\(\mathrm{CO_2}\)), water (\(\mathrm{H_2O}\)), and sunlight.
2. Examine the chemical equation for photosynthesis: The general equation is \$6\mathrm{CO_2} + 6\mathrm{H_2O} + \text{light energy} \rightarrow \mathrm{C_6H_{12}O_6} + 6\mathrm{O_2}\(. This shows that carbon dioxide (\)\mathrm{CO_2}$) is a necessary reactant in the process.
3. Clarify the role of carbon dioxide: Carbon dioxide is fixed during the Calvin cycle (light-independent reactions) of photosynthesis. It is used to form glucose (\(\mathrm{C_6H_{12}O_6}\)), which serves as an energy source for the plant.
4. Address the misconceptions: Plants do not use only oxygen for photosynthesis; oxygen (\(\mathrm{O_2}\)) is a byproduct of the process. Additionally, photosynthesis cannot occur without gases, as carbon dioxide is essential. Photosynthesis primarily occurs during the day when sunlight is available, not at night.
5. Conclude the correct answer: Based on the scientific understanding of photosynthesis, the correct answer is 'Yes, carbon dioxide is essential for photosynthesis.' Carbon dioxide is a fundamental reactant in the process.