Question

A student carried out an investigation to find the effect of carbon dioxide concentration on the rate
of photosynthesis of an aquatic plant.
The apparatus that the student used is shown in Fig. 2.1. The student was advised to use a light meter positioned at the same distance from the lamp as the pond plant. The student counted the number of bubbles produced by the cut end of the stem.

Answer 1

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Answer 2

Role of Carbon dioxide concentration in photosynthesis

Explanation:

• An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light independent reaction.
• The rate of photosynthesis generally increases until limited by another factor.
• When the concentration of CO₂ is low then the rate of photosynthesis is also low.
• Increase in concentration increases the rate of photosynthesis.