Concept explainers
(a)
Interpretation:
The data were most likely to be generated by the C4 plant and C3 plant should be determined.
Concept introduction:
When O2content is high in the atmosphere, the Rubisco enzyme(carbon-fixing enzyme of Calvin cycle) binds with O2 instead of CO2. The O2binding initiates oxygenase reaction rather than carboxylase reaction. This process is called photorespiration.
(b)
Interpretation:
Possible explanations for the decrease in photosynthetic activity at higher temperature should be determined.
Concept introduction:
Multiple factors affect enzyme activity such as temperature, pH, enzyme concentration, substrate concentration, and inhibitors or activators.
(c)
Interpretation:
Why C4 plants thrive at CO2 concentrations that do not support the growth of C3 plants should be explained.
Concept introduction:
C3 plants have no specific adaptations to minimize photorespiration. But C4 plants have a mechanism to reduce photorespiration. In C4, cells light-dependent reactions and Calvin cycles occur in two different types of cell
(d)
Interpretation:
A possible explanation of why C3 plants continue to increase photosynthetic activity at higher CO2 concentrations, whereas C4 plants reach a plateau should be suggested.
Concept introduction:
In C4 plants, atmospheric CO2 is first fixed in one type of cell as oxaloacetate and then converted to malate. Malate is then broken down to produce CO2 in another type of cells. This CO2 is then fixed to produce glucose via the Calvin cycle like C3 plants.
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BIOCHEMISTRY-ACHIEVE (1 TERM)
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