how to investigate the effect of light intensity on the rate of photosynthesis Flashcards

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1
Q

1.

A

prepare some pond weed in a large boiling tube containing water, cut stem upwards

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2
Q

2.

A

change intensity of light by altering the distance the light source is from the pond weed

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3
Q

3.

A

do this by using a ruler in cm

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4
Q

4.

A

position light source at first distance - allow pond weed to acclimatise to new light intensity before counting - ensure to do this of reach light intensity

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5
Q

5.

A

measure the number of bubbles produced by the pond weed per minute

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6
Q

6.

A

repeat each light intensity and calculate a mean

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7
Q

7.

A

ensure control variables - temperature (use a heat screen or LED bulb), same light source, concentration of carbon dioxide

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