Define photosynthesis.

Photosynthesis is the process by which plants, algae, and some bacteria transform carbon dioxide and water into glucose and oxygen, in the presence of light.

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What is the independent variable in the pondweed practical?

The distance from the lamp to the pondweed.

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What is the dependent variable in the pondweed practical?

The number of oxygen bubbles given off (the rate of photosynthesis).

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What are the control variables in the pondweed practical?

  1. The size of the pondweed
  2. The volume of water used
  3. The temperature of the water

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How do you measure the rate of photosynthesis in the pondweed practical?

  1. Count the number of bubbles released in three minutes.
  2. Record the volume of gas produced and collected in the measuring cylinder in the same three minutes.

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