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Sort the steps of photosynthesis in the correct sequence.
publish date: 2026/06/15 18:20:23.289532 UTC
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Photosynthesis occurs in two main stages inside the chloroplast. Arrange the following steps in the correct sequence.
Light energy is absorbed by chlorophyll in the grana
Light reactions produce energy-carrying molecules (ATP and NADPH)
Carbon dioxide enters the stroma
Carbon fixation reactions (Calvin cycle) use ATP and NADPH to build sugars
Glucose is produced and oxygen is released
Correct Answer
(1) Light energy is absorbed by chlorophyll in the grana
(2) Light reactions produce energy-carrying molecules (ATP and NADPH)
(3) Carbon dioxide enters the stroma
(4) Carbon fixation reactions (Calvin cycle) use ATP and NADPH to build sugars
(5) Glucose is produced and oxygen is released
Explanation
The two stages of photosynthesis in sequence:
- Light reactions (in the grana) — chlorophyll absorbs light and produces ATP and NADPH
- Calvin cycle / carbon fixation (in the stroma) — CO₂ is fixed into organic molecules (glucose) using the ATP and NADPH from the light reactions; oxygen is released as a byproduct
Reference
Biology: A Self-Teaching Guide