describe a suitable control variable for investigating the effects of light intensity on the rate of photosynthesis in aquatic plants.
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Explanation:
Investigating the rate of photosynthesis
This is an example of a common experiment used to investigate light intensity and the rate of photosynthesis. This should help you understand how to work scientifically.
Aim of the experiment
To use pondweed to see how light intensity affects the rate of photosynthesis.
Method
Set up the apparatus as in the diagram.
Leave for five minutes for the pondweed to acclimatise to the new light intensity.
Count the number of bubbles given off in one minute.
Move the light 10 cm further back.
Leave for five minutes for the pondweed to acclimatise again.
Count the number of bubbles given off in one minute.
Repeat by moving the lamp away by 10 cm intervals until 50 cm is reached.
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