31.To avoid excessive water loss during severe drought stress, the closure of stomata is signalled by the production of A. IAA B. NAA C. ABA D. IBA
Option C the concentration of ABA increases in the leaves of the plant during dessication and other stressful conditions . as a result stomata present in the epidermis of the leaves close to prevent loss of water ie: transpiration . therefore it can also be known as anti transpirant .
