The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Chloroplasts are green plastids which function as the site photosynthesis in eukaryotic photoautotrophs. Inside the leaves, the chloroplasts occur mostly in the mesophyll cells along their walls for easy diffusion of gases and receiving optimum quantity of incident light A chloroplast is covered by an envelope of two membranes, each of 9-10 nm thickness. Within the chloroplast, there is the membranous system consisting of grana, the stroma lamellae and the fluid stroma. This membrane system is responsible for trapping the light energy and also for the synthesis of ATP and NADPH. . So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.