(i) C, pathway or Hatch-Slack pathway prevents photorespiration in plants as these plants are adapted to dry tropical regions E.g. of C4 plants are sugarcane, maize, sorghum, pearl millet etc. in these plants, the vascular bundles are surrounded by large sized bundle sheath cells which are arranged is a wreath-like manner (Kranz - wreath). The anatomy of such leaves are called as Kranz Anatomy.
(ii) RuBisCo catalyses the carboxylation of RuBP to form an unstable 6C compound which breaks up into two 3C compound i.e. PGA Here the enzyme RuBisCo acts an carboxylase. At high temperature RuBP acts as oxygenase to form 4C compound OAA.3
