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Question
Answer the following question.
In C4 plants, bundle sheath cells carrying out the Calvin cycle are very few in number. Then also, C4 plants are highly productive. Explain.
Solution
- C4 plants have a special type of leaf anatomy called Kranz anatomy.
- In C4 plants, CO2 fixation occurs twice.
- In these plants, chloroplasts of mesophyll cells contain the enzyme PEP carboxylase which fixes atmospheric CO2. Thus, first CO2 fixation occurs in mesophyll cells.
- Decarboxylation of malic acid in bundle sheath cells results in an increase in CO2 concentration.
- Thus, RuBisCO acts as carboxylase and brings about carboxylation of RuBP.
- Due to this oxygenation of RuBP and photorespiration is prevented.
Thus, despite of having less number of bundle sheath cells carrying out Calvin cycle, C4 plants are highly productive.
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