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Leaf
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: The '''leaf''' is often wide and thin to collect as much sunlight as possible. The more sunlight it collects the more food it can make.
: The '''leaf''' has tubes called 'veins' inside it which carry the food away from the '''leaves''' to the [[roots]] and [[flower]] and to carry [[water]] into the '''leaf''' from the [[roots]].
==Key Stage 3==
===Meaning===
[[File:LeafCrossSection.png|right|300px|thumb|A cross section of a [[leaf]].]]
A [[leaf]] is an [[organ]] in the [[Shoot System|shoot system]] of a [[plant]] that uses [[photosynthesis]] to [[Producer|produce]] food for the [[plant]].
===About Leaves===
: The [[Cell (Biology)|cells]] in '''leaves''' have many [[chloroplast]]s inside them.
: '''Leaves''' produce food that is sent to the [[root]]s through the [[phloem]] which is a tube that carries sap.
'''Leaves''' have many tissues inside them found in layers:
*Upper Epidermis - A layer of cells at the top of the leaf that make wax to keep the leaf waterproof.
*[[Palisade Tissue]] - A layer of [[Palisade Cell|palisade cells]] which have lots of chloroplasts in them for photosynthesis.
*[[Spongy Mesophyll Tissue]] - A layer of [[Spongy Mesophyll Cell|spongy mesophyll cells]] that have irregular shapes to allow [[air]] to pass through the [[leaf]].
*Lower Epidermis - A layer of [[Cell (Biology)|cells]] at the bottom of the [[leaf]] with [[Stoma|stomata]] to allow [[air]] into and out of the [[leaf]].