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WAEC Biology 2005 Question 29

Question 29

Photosynthesis and Plant Nutrition

Which of the following statements is not true of the light stage of photosynthesis?

  1. A.Chlorophyll is energized by sunlight
  2. B.Water molecules split into hydrogen and hydroxyl ions
  3. C.Carbon (IV) oxide is reduced by hydrogen atoms in NADPH2
  4. D.Water is formed
Show the answer and explanation

Answer: C (Carbon (IV) oxide is reduced by hydrogen atoms in NADPH2)

Explanation

In the light stage, light energises chlorophyll and splits water into hydrogen and hydroxyl ions, and the hydroxyl ions join to give water and oxygen. Carbon (IV) oxide is reduced by hydrogen from NADPH2 only in the dark stage, so C is not true of the light stage.