Choose the correct sequence of steps occurring in CAM pathway
a. Involvement of PEPcase activity
b. Carboxylation of RuBP
c. Dehydrogenation of OAA
d. Decarboxylation of malic acid

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a, b, d, c

a, b, c, d

a, c, d, b

c, d, a, b

answer is C.

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Detailed Solution

In dark (during night), when the stomata are open, the carbon dioxide combines with phosphoenol pyruvic acid (PEP) to form oxaloacetic acid (OAA) in presence of enzyme PEPcarboxylase.

Oxalo acetic acid is subsequently converted to malic acid in presence of enzyme malic dehydrogenase. The reaction occurs in presence of NADH.

In light (during the day), when the stomata are closed, the malic acid is oxidatively decarboxylated to produce pyruvic acid.

Ultimately carboxylation of RuBP takes place in mesophyll cells.

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