the effect of light intensity on the rate of photosynthesis. Practical questions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What plant is used in this investigation | Elodea
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| how is the light intensity varied? | move the lamp
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| Why is the stem cut at an angle? | to increase the surface area for release of oxygen
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| At what temperature do plant enzymes work best? | 25 degrees celsius
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| after moving the lamp why must you wait before recording release of bubbles | to allow the plant time to adjust to the new light intensity
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| why are bubbles recorded at each distance three times? | average values are more accurate that single values
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| how is carbon dioxide kept constant? | use pond water or a solution of sodium hydrogen carbonate of known concentration
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| in relation to this investigation what is a limiting factor/ | any factor which is in short supply and therefore prevents the rate of photosynthesis from increasing
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| if there are no bubbles... | cut the stem again and gently crush the cut end between your fingers. This should release the bubbles
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| why is the pondweed kept at the bottom of the boiling tube? | it is easier to count the bubbles
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| why is it more suitable to conduct this activity during summer time? | Photosynthesis is taking place faster.
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