Leaf Structure

An easy to understand word document with my typed up notes on leaf structures.

Some definitions,
Key terms in red,
Explanation of how leaves are adapted for efficient photosynthesis.

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  • Created by: Hannah565
  • Created on: 01-06-12 11:54
Preview of Leaf Structure

First 310 words of the document:

Carbon dioxide + water = glucose + oxygen
Leaf features
Leaves are designed for making food by photosynthesis. The leaf structure is geared towards that.
Leaves are adapted towards efficient photosynthesis by:
Broad leaves ­ large surface area exposed to light.
Thin leaves ­ carbon dioxide and water vapour only have to travel a short distance to reach the
photosynthesising cell where it's needed.
Air spaces in the spongy mesophyll layer ­ this allows gasses like CO2 and 02 to move easily
between cells. This also means there's a large surface area for gas exchange (they have a very big
internal surface area to volume ratio)
The upper eperdimis is transparent ­ so light can pass through it to the palisade layer.
Lower surface is full of stomata (little holes) ­ They're there to let gasses like carbon dioxide and
oxygen in and out. They allow water to escape ­ which is known as transpiration.
Leaves have a network of veins ­ they deliver water and other nutrients to every part of the leaf
and take away the food produced by the leaf. They also help support leaf structure.
Leaf palisade cells are designed for photosynthesis.
1) They're packed with chloroplasts for photosynthesis.
2) Their tall shape means a lot of surface are is exposed down the side for absorbing carbon dioxide
from the air in the leaf.
3) Their tall shape also means that there's a good chance of light hitting a chloroplast before it
reaches the bottom of the cell.
Chlorophyll: A green pigment, present in all green plants, responsible for the absorption of light to
provide energy for photosynthesis.
Chloroplast: A plastid that contains chlorophyll and in which photosynthesis takes place.
Mesophyll: Middle part of a leaf.


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