D. Modes of Photosynthesis
1. In C3, plants Calvin cycle fixes CO2 directly; first molecule following CO2 fixation is PGA, a C3 molecule.
2. C4 leaves fix CO2 by forming a C4 molecule prior to the involvement of the Calvin cycle.
3. CAM plants fix CO2 by forming C4 molecule at night when stomates can open without loss of water.
4. C4 Photosynthesis
a. In a C4 plant, mesophyll cells contain well-formed chloroplasts arranged in parallel layers.
b. In C4 plants, bundle sheath cells as well as the mesophyll cells contain chloroplasts.
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