Define the following :
(a) Cristae
(b) Photophosphorylation
(c) Electrocardiograph

Explanation

(a) Cristae : Fingers like infolding of inner membrane of mitochondria to its matrix are called cristae.
(b) Photophosphorylation : The formation of ATP from ADP and inorganic phosphate in the light reaction of photosynthesis is called photophosphorylation. It is accomplished through cyclic or non-cyclic electron transport system (ETS).
(c) Electrocardiograph : An instrument used to record the fluctuations of the electrical potential of the heart during the cardiac cycle.