Concept:The palisade mesophyll layer contains many chloroplasts, so it is the main site of photosynthesis in a leaf.
Explanation:Photosynthesis is the process by which green plants make food using sunlight, carbon dioxide, and water.
Chloroplasts in leaf cells contain chlorophyll, which absorbs light energy for this process.
In a leaf cross-section, the palisade mesophyll lies below the upper epidermis.
Its tall, closely packed cells have the highest concentration of chloroplasts.
Therefore, this layer is most responsible for photosynthesis.
In the diagram given, the palisade mesophyll layer is labelled ii.
The other labelled parts are not the main photosynthetic tissues.
Answer:D. ii
