Final answer:
Chloroplasts are primarily found in the mesophyll tissue of leaves, which is responsible for photosynthesis. The mesophyll is made up of the palisade and spongy layers, both rich in chloroplasts, while the epidermis contains stomata for gas exchange, and the xylem transports water and minerals. The correct option is b.
Step-by-step explanation:
Chloroplasts are mainly found in the cells of the mesophyll within the leaf. The mesophyll is further divided into two layers: the upper palisade mesophyll, consisting of tightly packed, columnar cells, and the lower spongy mesophyll, made up of loosely packed, irregularly shaped cells.
Both layers of the mesophyll contain many chloroplasts, as this is where the process of photosynthesis occurs, transforming light energy into chemical energy stored in glucose.
The epidermis is the outer layer of cells that provides protection and contains openings called stomata for gas exchange, controlled by guard cells.
The xylem is part of the leaf's vascular bundle, responsible for the transport of water and minerals to the leaf cells. The correct option is b.