Conversion of light energy into chemical energy is a function of:
Correct answer: D. Grana
- A. Mitochondria
- B. Cytoplasm
- C. Stroma of chloroplast
- D. Grana
Explanation
The conversion of light energy into chemical energy occurs in the grana of chloroplasts. Grana are composed of thylakoids, which contain chlorophyll, the pigment responsible for capturing light energy. This energy is used to produce ATP and NADPH, which are essential for the photosynthesis process. The other options, such as mitochondria, cytoplasm, and stroma, do not perform this specific function. Mitochondria generate ATP through cellular respiration. The cytoplasm supports cellular processes but does not convert light energy. The stroma facilitates the Calvin cycle but does not capture light energy directly.
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About Bioenergetics
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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