. The cell organelle where photosynthesis occurs is
Photosynthesis is a process where carbon dioxide and water combine to form organic compounds and oxygen in the presence of sunlight.
It occurs in the chloroplast. So, it is the correct option.
(A) option is incorrect as chlorophyll is a pigment, not an organelle that is involved in photosynthesis.
(D) option is also incorrect as thylakoids are flattened membrane sacs in the chloroplast. It is a part of the organelle where photosynthesis occurs.
(B) option is also incorrect as mesophylls are present in leaves and play an important role in photosynthesis. But it is not a photosynthetic organelle.
Hence the correct answer is (C) Chloroplast.