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Difficulty: EasyPlant Nutrition and Photosynthesis

Which of the following biological processes occurs specifically during the light-independent stage (Calvin cycle) of photosynthesis in green plants?

  1. Reduction of carbon dioxide to synthesize simple sugarsAnswer
  2. B
    Photolysis of water to release oxygen gas
  3. C
    Synthesis of ATP through photophosphorylation
  4. D
    Unidirectional translocation of synthesized organic food through xylem vessels

Answer

Reduction of carbon dioxide to synthesize simple sugars
During the light-independent stage (Calvin cycle) in the chloroplast stroma, carbon dioxide is chemically reduced to form triose phosphate and glucose using NADPH and ATP generated during the light stage.

Step-by-Step Solution

1
Identify the two main stages of photosynthesis and their cellular locations.
The light-dependent stage occurs in the thylakoids, while the light-independent stage (Calvin cycle) occurs in the stroma of chloroplasts.
Different enzymatic and chemical reactions are spatially compartmentalized within the chloroplast.
2
Determine the specific biochemical events of the light-independent stage.
Atmospheric carbon dioxide is fixed by RuBP and reduced using ATP and NADPH to form carbohydrates such as glucose.
This stage does not require direct light photons but relies on the chemical energy products formed during the light-dependent stage.

Key Concept

Light-Independent Reaction (Calvin Cycle)
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Topics

Plant Nutrition and Photosynthesis

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