Question

State and explain four factors that affect the rate of photosynthesis.

Answer 1

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Several factors can affect the rate of photosynthesis: light intensity. carbon dioxide concentration.These include:

1. the rate of oxygen output.
2. the rate of carbon dioxide uptake.
3. the rate of carbohydrate (glucose) production.

Answer 2

Answer:

Factors affecting photosynthesis

There are several ways of measuring the rate of photosynthesis in the laboratory. These include:

• the rate of oxygen output
• the rate of carbon dioxide uptake
• the rate of carbohydrate (glucose) production
• These are not perfect methods as the plant will also be respiring, which will use up some oxygen and carbohydrate and increase carbon dioxide output.

Several factors can affect the rate of photosynthesis:

• light intensity
• carbon dioxide concentration
• temperature
• The amount of chlorophyll also affects the rate of photosynthesis:
• plants in lighting conditions unfavourable for photosynthesis synthesise more chlorophyll, to absorb the light required
• the effects of some plant diseases affect the amount of chlorophyll, and therefore the ability of a plant to photosynthesise, such as downy mildew in grape vines