The following graph shows the relationship between light intensity and net oxygen uptake or output by a particular green plant - VCE - SSCE Biology - Question 6 - 2008 - Paper 1
Question 6
The following graph shows the relationship between light intensity and net oxygen uptake or output by a particular green plant.
At a light intensity of 10 units
A.... show full transcript
Worked Solution & Example Answer:The following graph shows the relationship between light intensity and net oxygen uptake or output by a particular green plant - VCE - SSCE Biology - Question 6 - 2008 - Paper 1
Step 1
A. the rate of photosynthesis is zero.
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Answer
At a light intensity of 10 units, the rate of photosynthesis is not zero, as the graph indicates a positive net oxygen output.
Step 2
B. the rate of aerobic respiration is zero.
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Answer
The rate of aerobic respiration is not zero at this light intensity, since plants always respire even when photosynthesis occurs.
Step 3
C. oxygen produced by photosynthesis is equal to the oxygen used by aerobic respiration.
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Answer
This statement is correct as indicated by the graph; at this light intensity, net oxygen output is zero, meaning that the oxygen produced through photosynthesis exactly equals the amount of oxygen consumed through respiration.
Step 4
D. oxygen produced by photosynthesis is equal to twice the oxygen used by aerobic respiration.
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Answer
This statement is incorrect since the graph shows that at this light intensity the net oxygen uptake/output is zero, indicating that the two processes are balanced rather than one being twice that of the other.
