why do plants such as maize and sugarcane have dimorphic chloroplast ?

Maize is a common example of C4 plants i.e it has special type of anatomy known as Kranz anatomy in which vascular bundles are surrounded by large cells known as  bundle sheath cells. These bundle sheath cells contain chloroplast lacking  grana whereas adjacent mesophyll cells possess abundant of grana. This presence of dimorphic chloroplast contribute in greater productivity of biomass, lack of photo respiration and tolerance of high temperatures in C4 plants.

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