WAEC Biology 2021 Objective — Question 27
Question 27 of 50 from the West African Examinations Council (WAEC) Biology 2021 Objective paper, with the correct answer and a full explanation.
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27. The process that takes place at the light stage of photosynthesis is
- A. splitting of water molecules to form hydrogen ions.Correct
- B. reduction of carbon (IV) oxide to form carbohydrate.
- C. formation of two molecules of phosphoglyceric acid.
- D. breaking down of ATP molecules to produce energy.
Explanation
The light stage (light-dependent reaction) splits water molecules (photolysis) to release hydrogen ions and oxygen; CO2 reduction happens in the dark stage.
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