Question:

Figure 11.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions: 
the effect of light on the rate of photosynthesis
  1. At which point/s (A, B or C) in the curve is light a limiting factor? 
  2. What could be the limiting factor/s in region A? 
  3. What do C and D represent on the curve?

Updated On: Nov 18, 2023
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Solution and Explanation

(a) In region A, light is a constraint. The factor in the shortest supply, known as the limiting factor, will restrict the rate of a process. The rate of reaction will alter if a limiting factor changes in strength.

(b) In region A, temperature, light, and carbon dioxide content could be limiting variables.

(c) C stands for light saturation. Here, the limitation is no longer light. Temperature or the amount of carbon dioxide present could be the limiting factor in this case. The letter D stands for the point at which the carbon dioxide saturation maximum that the plant needs for photosynthesis has been attained.

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Concepts Used:

Photosynthesis in Higher Plants

Processes Of Photosynthesis in Higher Plants:

Photosynthesis in higher plants involves the following processes:

  • Light Reaction
  • Dark Reaction

Light Reaction:

  • This phenomenon occurs in the presence of light.
  • The pigment absorbs light and produces energy in the form of ATP.
  • The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.

Dark Reaction:

This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:

  1. Calvin Cycle (C3 Cycle)
  2. C4 Cycle (Hatch and Slack Pathway)