Question
Biology Question on Photosynthesis in higher plants
Which is the first CO2 acceptor enzyme in C4 plants
A
RuDP carboxylase
B
phosphoric acid
C
RuBisCO
D
PEP- carboxylase.
Answer
PEP- carboxylase.
Explanation
Solution
C4 pathway was first reported in members of family Gramineae (grasses) like sugarcane, maize, sorghum, etc. These C4 plants have a characteristic leaf anatomy called Kranz anatomy. So in chloroplasts of mesophyll cells -PEPCo (PEP carboylase) is the key enzyme used to fix CO2 in C4 plants Oxaloacetic acid is a 4-C compound and is the first stable product so this pathway is known as C4 cycle.