The palisade cells are the structures labelled as number III. The palisade cells are a type of leaf cells found in the mesophyll layer of a leaf. They are located just below the upper epidermis and are arranged vertically, standing upright like a palisade fence.
The palisade cells are responsible for carrying out most of the photosynthesis in the leaf. They contain a large number of chloroplasts, which are the organelles responsible for capturing light energy and converting it into chemical energy through the process of photosynthesis. The palisade cells are specifically adapted to capture sunlight efficiently, as they are located close to the top of the leaf where they can receive the most light.
Therefore, the correct option to the question is "III" as the palisade cells are located in the structure labelled as number III.
