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Subject :NSO    Class : Class 7

The given graph shows net uptake and net release of oxygen by a plant kept in open over a 24 hour period.
Which of the following holds true regarding the given graph?

A At 0800 hour, the oxygen taken up by plant in respiration is equal to oxygen released by it during photosynthesis.
B Plant is respiring throughout the 24 hour period but it is photosynthesising only between 0600 hours to 1800 hours.
C Assuming that the plant has the same respiration rate throughout 24 hour period, 70 mg of oxygen is produced by plant at 1600 hour.
D The highest rate of photosynthesis occurs at 1200 hour.

Ans 1:

Class : Class 9

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