Answer:
(a)
7.00am (1)
(b) The rate of photosynthesis was greatest at 12 noon as the amount of
carbon dioxide taken in was greatest at that time. (1)
(c) 9.00pm (1)
(d) (i) Respiration (1/2)
(ii) No, respiration occurs 24 hours a day.
During daylight, photosynthesis takes in more carbon
dioxide than is released by respiration. (1/2)
(e) Factors which affect the rate of photosynthesis are
humidity, temperature and concentration levels of carbon dioxide in the air.
There are optimum levels for each factor above, after which photosynthesis
will start to decrease. (1)
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