Question

which of the following statements describes a difference between photosynthesis and cellular respiration in plants?

• 1 point

○ photosynthesis occurs only during the day, whereas cellular respiration occurs only at night.
○ photosynthesis involves only one reaction, whereas cellular respiration involves many steps.
○ photosynthesis occurs only in cells containing chlorophyll, but cellular respiration occurs in all cells.
○ photosynthesis converts light energy into chemical energy, but cellular respiration converts light energy into heat energy.

Explanation:

1. Analyze Option 1: Cellular respiration occurs 24/7 in plants, not just at night. So this is incorrect.
2. Analyze Option 2: Photosynthesis has two main stages (light - dependent and light - independent) and many sub - steps, so it's not a single reaction. This is incorrect.
3. Analyze Option 3: Photosynthesis requires chlorophyll (found in chloroplasts) and thus only occurs in cells with chlorophyll (like plant leaf cells). Cellular respiration is a process to produce energy and occurs in all living cells (both plant and animal) to break down glucose. This is correct.
4. Analyze Option 4: Cellular respiration converts chemical energy (from glucose) into ATP (a form of chemical energy) and heat, not light energy into heat energy. Photosynthesis converts light energy into chemical energy (glucose). This is incorrect.

Answer:

C. Photosynthesis occurs only in cells containing chlorophyll, but cellular respiration occurs in all cells. (Note: Assuming the options are labeled A, B, C, D in order, the third option is the correct one. If the original options had different labels, adjust accordingly based on the content. Here we assume the third option is option C for labeling consistency.)