Figure 11.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions:
- At which point/s (A, B or C) in the curve is light a limiting factor?
- What could be the limiting factor/s in region A?
- What do C and D represent on the curve?
- At which point/s (A, B or C) in the curve is light a limiting factor?
- What could be the limiting factor/s in region A?
- What do C and D represent on the curve?
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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(c) What role can you, as a citizen, play in protecting urban greenery?
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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:
- Calvin Cycle (C3 Cycle)
- C4 Cycle (Hatch and Slack Pathway)