The phase of photosynthesis in which sugar is synthesized by reducing CO₂ is also called the dark reaction because:
Correct answer: B. It does not require light
- A. It requires darkness
- B. It does not require light
- C. It requires night period
- D. It produces darkness in the chloroplast
Explanation
The dark reaction, also known as the Calvin cycle, is called so because it does not require light directly to carry out its chemical processes. During this phase, carbon dioxide is reduced to form sugars using the energy stored in ATP and the reducing power of NADPH, both of which are produced in the light-dependent reactions. Although it relies on the products of light reactions, the chemical steps of carbon fixation, reduction, and regeneration can proceed without light, which is why this phase is referred to as the dark reaction.
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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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For the synthesis of sugar by reducing CO₂, NADPH₂ provides:
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