Cyclic photophosphorylation occurs when only PS I is functional and the electron is circulated within the photosystem . It typically happens in the stroma lamellae, which lack PS II and the NADP reductase enzyme . Therefore, the statement claiming it involves both photosystems is incorrect. The other statements are correct: Grana lamellae possess both PS I and PS II , and non-cyclic photophosphorylation synthesises both ATP and NADPH + H+ .