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Plant nutrition - Coggle Diagram
Plant nutrition
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6.2 - Leaves
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The structure of a leaf
A leaf consists of a broad, flat part, which is joined to the rest of the plants by a leaf stalk
Inside the leaf stalk are collections of parallel tubes called vascular bundles. They consist of collections of xylem tubes and phloem vessels running side by side, which form the veins in a leaf.
leaves have a large surface area allows large amounts of sunlight to fall onto the leaf. Also increase the rate at which carbon dioxide can diffuse into the leaf from the air.
The leaves are very thin means that sunlight can pass through the leaf, allowing ,many cells inside to photosynthesise. Also helps carbon dioxide to reach all the cells quite quickly by diffusion.
Water is brought to the leaf from the soil, in tubes called xylem vessels. These run in the vascular bundles, which forms the veins in the leaf.
Tiissues in a leaf
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on the top is the upper epidermis, then there is the palisade mesophyll layer, then the spongy mesophyll, then the lower epidermis cells with a stomata and guard cells.
Chloroplasts
The palisade mesophyll cells, spongy mesophyll cells and guard cells in a leaf all contain chloroplasts.