(B) In most dicotyledonous plants,the guard cells of the stomata are kidney-shaped or bean-shaped.However,in monocotyledonous plants like grasses,the

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(B) In most dicotyledonous plants,the guard cells of the stomata are kidney-shaped or bean-shaped.However,in monocotyledonous plants like grasses,the guard cells are dumb-bell shaped.The outer walls of these guard cells are thin,while the inner walls are highly thickened,which helps in the opening and closing of the stomata.