Question 1: The pigment chlorophyll is contained in plastids.
Chlorophyll is the green pigment found in green plastids called chloroplasts.
Chromoplasts are plastids, too, but they contain carotenoids. Stroma and grana are the parts of chloroplast thylakoids, the site where the light-dependent reactions of the photosynthesis occurs.
Question 2: The two primary jobs of parenchyma cells are photosynthesis and food storage.
Parenchyma cells are the most abundant cells in the plants and at the same time the least specialized. They are specialized for different functions such as photosynthesis and food storage. In the leaves, parenchyma cells form mesophyll where photosynthesis takes a place. These cells can also serve as a storage for starch, fats, oils, proteins, etc.
