The dark reaction of photosynthesis occurs in:
Correct answer: A. Stroma
- A. Stroma
- B. Thylakoid
- C. Grana
- D. Cytoplasm
Explanation
The dark reaction of photosynthesis, also known as the Calvin cycle, takes place in the stroma of the chloroplast. The stroma contains the necessary enzymes for carbon dioxide fixation, where carbon dioxide is converted into glucose using ATP and NADPH from the light reactions. The thylakoids and grana are involved in the light-dependent reactions, where light energy is captured to produce ATP and NADPH, but they are not sites of the dark reaction. The cytoplasm also does not take part in this process, as it lies outside the chloroplast. Therefore, the stroma is the correct location for the dark reaction of photosynthesis.
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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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The Calvin cycle occurs in:
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