In a leaf, the region containing the most chlorophyll is the?

In a leaf, the region containing the most chlorophyll is the?

• A. Xylem
• B. Upper epidermis
• C. Lower epidermis
• D. Palisade layer

Answer: (D)

Chlorophyll is concentrated in chloroplasts where photosynthesis happens, and in leaves the most chlorophyll is found in the palisade mesophyll just beneath the upper surface. These tall, tightly packed cells are packed with chloroplasts, maximizing light absorption and conversion of light energy to chemical energy. The xylem carries water, while the epidermal layers mainly protect and regulate gas exchange, containing far fewer chloroplasts; the spongy mesophyll has some chloroplasts too, but not as densely as the palisade layer.

Chlorophyll is concentrated in chloroplasts where photosynthesis happens, and in leaves the most chlorophyll is found in the palisade mesophyll just beneath the upper surface. These tall, tightly packed cells are packed with chloroplasts, maximizing light absorption and conversion of light energy to chemical energy. The xylem carries water, while the epidermal layers mainly protect and regulate gas exchange, containing far fewer chloroplasts; the spongy mesophyll has some chloroplasts too, but not as densely as the palisade layer.