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Leaves
Descripción
Mapa Mental sobre Leaves, creado por alex.patterson el 14/04/2016.
Mapa Mental por
alex.patterson
, actualizado hace más de 1 año
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Creado por
alex.patterson
hace alrededor de 8 años
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Resumen del Recurso
Leaves
Leaves are specially adapted for photosynthesis
Each component of a leaf has a special function
Most leaves
are green- they contain chlorophyll, which absorbs sunlight
are thin- this allows gases to diffuse in and out of the leaf easily
have a large surface area- to absorb as much light as possible
The underneath of the leaf is lighter than the top
This is because the cells at the bottom of the leaf contain fewer chloroplasts
Most sunlight hits the top of the leaf so this is where the chloroplasts need to be to absorb as much light as possible
The top of the leaf feels waxy
The waxy layer reduces the amount of water evaporating out of the leaf
The tiny holes at the bottom of the leaf are called stomata
Their function is to allow gases to diffuse into and out of the leaf
Carbon dioxide diffuses in.Carbon dioxide is a reactant in photosynthesis
Oxygen and water vapour diffuses out. Oxygen and water are products of photosynthesis
Stomata are opened and closed by guard cells. These cells open the stomata during the day, and close them at night
The leaf is divided into two layers
Palisade layer- contains cells packed with chloroplasts. This is where most of a plant's photosynthesis occurs
spongy layer- contains air spaces, allowing carbon dioxide to diffuse throughout the leaf. Oxygen diffuses out the leaf
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