Question

CO2 levels
Light intensity
Temperature

For each factor, explain how limiting it will affect photosynthesis
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Answer 1

Answer:

Interaction of Factors

For example, light intensity can only increase the rate of photosynthesis up to the point that temperature or carbon dioxide levels limit it. Similarly, even if you have plenty of carbon dioxide and a perfect temperature, if there is low light the rate will also be low.

Answer 2

Answer:

CO2 Concentration :

• It is a major limiting factor influencing the rate of photosynthesis. The concentration of CO2 is very low in the atmosphere (between 0.03% and 0.04%).
• This level of CO2 is far below the requirement foe optimum photosynthesis. Increase in the concentration up to 0.05% can cause an increase in the rate of photosynthesis but beyond this level, it becomes damaging over longer periods.
• The C3 and C4 plants respond differently to CO2 concentration. At low light intensities, neither type responds to high CO2 concentration. At high light intensities, both C3 and C4 plants show increase in the rate of photosynthesis.

Light intensity :

• Light is the most important factor which governs the rate of photosynthesis.
• It affects the rate in three ways

1. Quality
2. Intensity
3. Duration

Temperature :

• Photosynthesis can take over a wide range of temperatures
• Some conifers can photosynthesize at -6°C.
• The C4 plants respond to higher temperatures and they show higher rate of photosynthesis, while C3 plants have much lower temperature optimum.
• Optimum temperature in C3 plant is 20 - 25°C and for C4 plant is 30 - 45°C.

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