Could plants live in an environment with high oxygen concentration?
Answers
Answer:
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Explanation:
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The influence of oxygen concentration in the range 0–21% on photosynthesis in intact leaves of a number of higher plants has been investigated.
Photosynthetic Co2 fixation of higher plants is markedly inhibited by oxygen in concentrations down to less than 2%. The inhibition increases with oxygen concentration and is about 30% in an atmosphere of 21% O2 and 0.03% Co.2. Undoubtedly, therefore, oxygen in normal air exerts a strong inhibitory effect on photosynthetic Co2 fixation of land plants under natural conditions.
The inhibitory effect of oxygen is rapidly produced and fully reversible.
The degree of inhibition is independent of light intensity.
The influence of oxygen concentration in the range 0–21% on photosynthesis in intact leaves of a number of higher plants has been investigated.
Photosynthetic Co2 fixation of higher plants is markedly inhibited by oxygen in concentrations down to less than 2%. The inhibition increases with oxygen concentration and is about 30% in an atmosphere of 21% O2 and 0.03% Co.2. Undoubtedly, therefore, oxygen in normal air exerts a strong inhibitory effect on photosynthetic Co2 fixation of land plants under natural conditions.
The inhibitory effect of oxygen is rapidly produced and fully reversible.
The degree of inhibition is independent of light intensity.
The quantum yield for Co2 fixation, i.e. the slope of the linear part of the curve for Co2 uptake versus absorbed quanta, is inhibited to the same degree as the light saturated rate at all oxygen concentrations studied.