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JAMB Biology 2002 Question 33

Question 33

Photosynthesis and Plant Nutrition

Use the diagram of the experiment to answer: The experimental set-up can be used to demonstrate that

Diagram for this question
  1. A.light is necessary for photosynthesis
  2. B.oxygen is necessary for photosynthesis
  3. C.photosynthesis occurs in the leaves of plants
  4. D.carbon(IV) oxide is necessary for photosynthesis.
Show the answer and explanation

Answer: D (carbon(IV) oxide is necessary for photosynthesis.)

Explanation

Caustic soda (sodium hydroxide) absorbs carbon(IV) oxide from the air in the flask. The leaf inside does not make starch, which shows carbon(IV) oxide is needed for photosynthesis.