Identifying the reaction as cellular respiration

Steps:

• Recognize the equation C6H12O6 + 6O2 → 6CO2 + 6H2O as aerobic cellular respiration, where glucose is broken down to release energy.
• Recall that respiration provides energy for all living cells and does not require light.
• Eliminate options requiring light or plant-specific factors, as respiration is universal.
• Confirm the correct statement matches respiration's characteristics: it proceeds in the absence of light.

Why B is correct:

• Cellular respiration occurs continuously in living organisms, including in the dark, as it does not depend on light energy unlike photosynthesis.

Why the others are wrong:

• A: The reaction is exothermic, releasing energy (ΔH negative), not endothermic.
• C: Chlorophyll is a catalyst for photosynthesis, not respiration.
• D: Respiration occurs in both plants and animals for energy production.

Final answer: B