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Question
Observe the diagram and answer the following:
Which group of plants exhibits these two types of cells? b. What is the first product of the C4 cycle? c. Which enzyme is there in bundle sheath cells and mesophyll cells?
Which group of plants exhibits these two types of cells? b. What is the first product of the C4 cycle? c. Which enzyme is there in bundle sheath cells and mesophyll cells?Open in App
Solution
C4 plants:
The diagram given in the question depicts the Kranz anatomy seen in C4 plants. In C4 plants the Calvin cycle occurs in the bundle sheath cells as shown in the figure.
Example - Maize and sorghum.
Final answer:
C4 plants
Fixation of CO2:
In C4 plants, atmospheric CO2 in the form of HCO−3 combines with phosphoenolpyruvate (PEP) to form a 4 carbon first stable product that is oxaloacetate.
Final answer:
Oxaloacetate (OAA)
Enzymes in bundle sheath cells :
PEP Carboxylase - It catalyzes the formation of oxaloacetate by combining atmospheric CO2 and phosphoenolpyruvate (PEP).
Enzymes in mesophyll cells:
RuBisCO- It catalyzes the formation of the first stable 3- carbon product 3- phosphoglyceric acid by fixing atmospheric CO2 with RuBP.
Final answer:
Bundle sheath cells - PEP carboxylase Mesophyll cells - RuBISCO.
The diagram given in the question depicts the Kranz anatomy seen in C4 plants. In C4 plants the Calvin cycle occurs in the bundle sheath cells as shown in the figure.
Example - Maize and sorghum.
Final answer:
C4 plants
Fixation of CO2:
In C4 plants, atmospheric CO2 in the form of HCO−3 combines with phosphoenolpyruvate (PEP) to form a 4 carbon first stable product that is oxaloacetate.
Final answer:
Oxaloacetate (OAA)
Enzymes in bundle sheath cells :
PEP Carboxylase - It catalyzes the formation of oxaloacetate by combining atmospheric CO2 and phosphoenolpyruvate (PEP).
Enzymes in mesophyll cells:
RuBisCO- It catalyzes the formation of the first stable 3- carbon product 3- phosphoglyceric acid by fixing atmospheric CO2 with RuBP.
Final answer:
Bundle sheath cells - PEP carboxylase Mesophyll cells - RuBISCO.
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