OCR B4 C4 P4 May 2012 question 1b

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mughilsingh
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#1
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#1
Please see the question in the image.
The question is:
Paul is investigating photosynthesis.
He grows several samples of cress.
(i) Paul uses the mass of cress as a measure of the rate of photosynthesis.

Why can the mass of cress be used as a measure of the rate of photosynthesis?


This question looks so wrong. I did research on measure the rate of photosynthesis. I don't see anywhere they weigh the plants to measure the rate of photosynthesis.

Please correct me if I am wrong
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