Photosystem II occurs in:

Explanation

Grana are structures within chloroplasts that consist of stacks of thylakoid discs. Thylakoids are flattened membrane sacs inside chloroplasts where the light-dependent reactions of photosynthesis take place.The primary function of grana is to enhance the efficiency of the light-dependent reactions of photosynthesis. The thylakoid membranes contain pigments like chlorophyll that capture light energy. This captured light energy is then used to convert water and carbon dioxide into oxygen and glucose during the process of photosynthesis.