Describe adaptations of a leaf for photosynthesis and transpiration.

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Step 1: Describe adaptations of a leaf for photosynthesis (11.1). 11.1 Photosynthesis: Leaves have a large, flat surface area to maximize the absorption of sunlight. They are thin to allow for short diffusion distances for carbon dioxide to reach the photosynthetic cells and for oxygen to exit. The palisade mesophyll layer contains numerous chloroplasts, which are packed with chlorophyll to absorb light energy. Stomata on the leaf surface allow for the intake of carbon dioxide and release of oxygen. A network of veins (xylem) supplies water to the photosynthetic cells. Step 2: Describe adaptations of a leaf for transpiration (11.2). 11.2 Transpiration: Stomata, primarily on the lower epidermis, allow for the diffusion of water vapor out of the leaf. The spongy mesophyll layer has large air spaces, creating a large internal surface area for water to evaporate from the cell surfaces into the air spaces. A network of xylem vessels in the veins transports water from the roots to the leaves, replacing the water lost through transpiration. The cuticle on the leaf surface is a waxy layer that reduces uncontrolled water loss from the epidermis.

Describe adaptations of a leaf for photosynthesis and transpiration.

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Describe adaptations of a leaf for photosynthesis (11.1).

Describe adaptations of a leaf for transpiration (11.2).

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