Roughly what share of the oxygen produced in a leaf is used by the leaf's own mitochondria?
A1 percent
B10 percent
C40 percent
D80 percent
Answer & Solution
Correct answer: B. 10 percent
1. A photosynthesising leaf is also a respiring tissue.
2. Some of the oxygen it releases never leaves the leaf at all.
3. About 10 percent of the oxygen is used by mitochondria in the leaf to support oxidative phosphorylation.
4. The rest diffuses out through the stomata.
5. The figure is small but not negligible, which rules out both 1 and 40 percent.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 8 'Photosynthesis', sections 8.1-8.3_
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