Q14 of 59 Page 68

When CO2 is added to PEP, the first stable product synthesised is:

The first stable product synthesized is OAA i.e. oxaloacetate.

In C4 plants, initial fixation of CO2 or carboxylation occurs in mesophyll cells. The chloroplasts of mesophyll cells possess enzyme PEP carboxylase for initial fixation of CO2. The primary acceptor of CO2 is phosphoenol pyruvate. PEP combines with CO2 in the presence of PEP carboxylase to form oxaloacetate.



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12

The enzyme that is not found in a C3 plant is

 13

The reaction that is responsible for the primary fixation of CO2 is catalysed by

 1

Examine the figure

Chp13.1.png


a. Is this structure present in animal cell or plant cell?


b. Can these be passed on to the progeny? How?


c. Name the metabolic processes taking place in the places marked (1) and (2).


 2

2H2O 4H+ + O2 + 4e-

Based on the above equation, answer the following questions:


a. Where does this reaction take place in plants?


b. What is the significance of this reaction?