Answer: ADAPTATIONS OF A LEAF A leaf is a key plant organ responsible for photosynthesis. Large SA-increases SA for the diffusion of CO₂ + absorption of light for photosynthesis Thin - allows CO₂ to diffuse to palisade mesophyll cells quickly. Chlorophyll absorbs light energy so that photosynthesis can take place. Vein Network - allows the transport of water to the cells of the leaf + carbohydrates from the leaf for photosynthesis (water for PS, carbs as a product of PS). Stomata - allows CO₂ to diffuse into the leaf O, to diffuse out Thin Epidermis allows more light to reach the palisade ceus. Thin Wax Cuticle-to protect the leaf without blocking sunlight. LEAF STRUCTURES Palisade Cell Layer - maximises the absorption of light as it will hit chloroplasts in the cells directly. -air spaces allow CO, to diffuse through the leaf, increasing the SA Vascular Bundles - thick cell walls of the tissue in the bundles help support the stem and leaf. Spongy Layer Plant Tissues 82 Organisation Paper 1 Wax cuticle protective layer on top of the leaf, prevents water from evaporating. Upper epidermis- thin + transparent to allow light to enter palisade mesophyll layer underneath it. Palisade mesophyll-column shaped cells tightly packed with chloroplasts to absorb more light, maximising photosynthesis. Spongy mesophyll-contains internal air spaces that increases the surface area to volume.
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