Which of the following absorbs light energy for photosynthesis?
Correct answer: A. Chlorophyll
- A. Chlorophyll
- B. Water molecules
- C. O2
- D. RuBP
Explanation
The correct answer is chlorophyll. Chlorophyll is the green pigment in chloroplasts responsible for absorbing light energy, which is vital for photosynthesis. This energy is used to split water molecules, releasing oxygen, and to convert carbon dioxide into glucose. Water molecules are involved in the light-dependent reactions but do not absorb light. Oxygen (O₂) is simply a byproduct of these reactions, with no role in light absorption. RuBP is part of the Calvin cycle, contributing to carbon fixation but not light absorption.
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Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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