Correct Answer: B

Rationale: Photosynthesis is the biological process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy stored in glucose. This process takes place in the chloroplasts, which contain the green pigment chlorophyll that captures sunlight. The chemical equation for photosynthesis is 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂. During this reaction, carbon dioxide and water are transformed into glucose and oxygen, sustaining both plant life and the atmospheric oxygen balance. Photosynthesis is fundamental to life on Earth as it forms the base of the food chain and regulates global carbon cycles.

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