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  4. The first carbon-dioxide acceptor in C4 plants is :

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Q. The first carbon-dioxide acceptor in $ {{C}_{4}} $ plants is :

Bihar CECEBihar CECE 2003

Solution:

$ {{C}_{4}} $ plants are characterised by Kranz anatomy. $ {{C}_{4}} $ pathway of photosynthesis was discovered by Hatch and Slack. (1965). In $ {{C}_{4}} $ plants the $ C{{O}_{2}} $ combines with phosphoenol pyruvate (PEP) to form a 4-C compound oxaloacetic acid (Hence, named $ {{C}_{4}} $ plant). It is the first product of $ {{C}_{4}} $ cycle. On the other hand in $ {{C}_{3}} $ plants the $ C{{O}_{2}} $ combines with ribulose 1-5, diphosphate to form the 3-C-compound phosphoglyceric acid. It is the first stable product of $ {{C}_{3}} $ plants.