B2 - The Rate of Photosynthesis

  • Limiting factors
  • Experiment
  • Artificial recreation
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What is the experiment that works out the ideal conditions for photosynthesis?
Put a bung in a flask of water and pondweed. Count the bubbles of oxygen or collect it in a gas syringe.
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What does light do to the rate of photosynthesis?
As the light level is raised the rate of photosynthesis increases steadily - but only to a certain point. Beyond that it will either be the temperature or CO2 which is the limiting factor. Not enough light will slow the rate of photosynthesis.
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What does carbon dioxide do to the rate of photosynthesis?
The amount of CO2 will increase the rate of photosynthesis to a certain point. After that the limiting factor is temperature. Too little CO2 will slow the rate of photosynthesis.
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What does temperature do to the rate of photosynthesis?
If the temperature is the limiting factor it is usually too low. Enzymes needed for photosynthesis work slower at low temperatures. At around 45 degrees celcius, enzymes can get damaged.
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How do greenhouses control conditions for photosynthesis?
They trap the sun's heat to control the temperature. They often have artificial light they control. They can also control the CO2 levels. It also keeps them free of pests and dseases. They can also use fertilisers and it makes the plants grow faster.
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Other cards in this set

Card 2

Front

What does light do to the rate of photosynthesis?

Back

As the light level is raised the rate of photosynthesis increases steadily - but only to a certain point. Beyond that it will either be the temperature or CO2 which is the limiting factor. Not enough light will slow the rate of photosynthesis.

Card 3

Front

What does carbon dioxide do to the rate of photosynthesis?

Back

Preview of the front of card 3

Card 4

Front

What does temperature do to the rate of photosynthesis?

Back

Preview of the front of card 4

Card 5

Front

How do greenhouses control conditions for photosynthesis?

Back

Preview of the front of card 5

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