6. The first product of CO 2 fixation in Hatch and Slack (C4) cycle in plants is
Question
6. The first product of CO 2 fixation in Hatch and Slack (C4) cycle in plants is
Solution
The first product of CO₂ fixation in the Hatch and Slack (C4) cycle in plants is oxaloacetate, which is a four-carbon compound. In the C4 pathway, CO₂ enters the plant cells and is initially fixed into oxaloacetate by the enzyme phosphoenolpyruvate carboxylase (PEP carboxylase). This reaction takes place in the mesophyll cells of the leaves.
Oxaloacetate is then typically converted to another four-carbon compound, malate, which is transported to the bundle sheath cells. In these cells, malate is decarboxylated to release CO₂ for the Calvin cycle, thereby enhancing the efficiency of photosynthesis, particularly in conditions of low CO₂ and high oxygen concentration. This adaptation allows C4 plants to thrive in hot and arid environments.
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