Photosynthesis is composed of two main parts (light-dependent and light-independent). photosystem i (ps i) and photosystem ii (ps ii) are alike in many ways. how does photosystem i and photosystem ii differ from one another? a) ps i produces glucose while ps ii produces atp. b) ps i occurs in the stroma while ps ii takes place in the thylakoid membranes. c) ps i is a light-independent reaction while ps ii is a light-dependent reaction. d) ps i absorbs the longer wavelength of light while ps ii absorbs a shorter wavelength of light.