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Root Hair Cell

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on 24 September 2013

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Transcript of Root Hair Cell

Some stuff about plants...
The Leaf.
Water and Minerals
Plants have also adapted to take water and mineral ions from the soil more efficiently, particularly at the end of their roots where we find 'root hair cells'.
Transpiration
When stomata are opened by the gaurd cells around them, in order to take in carbon dioxide, water vapour diffuses out and evaporates. Loss of water vapour is known as 'transpiration'.
Transport
The tranpiration stream pulls minerals and sugars through the plant as well as water, in order to feed the plant.
What do plants need in order for photosynthesis to take place?
By what proccess might they acquire this carbon dioxide?
What adaptations might benefit a leaf's ability to absorb carbon dioxide?
In order for plants to photosynthesise they need both light and carbon dioxide.

The quicker they get them, the more the rate of photosynethesis increases.
Leaves absorb the carbon dioxide through a proccess called diffusion.
Plants have adapted to absorb carbon dioxide more easily.

The flattened shape of the leaf gives it a large surface area.
The thickness of the leaf means that there is a short diffusion distance to the photosynthesising cell.
One other adaptation of the leaf, that increases the rate of diffusion, is 'stomata'.

Stomata are small openings on the leaf surface that allows carbon dioxide to diffuse quickly down a concentration gradient into photosynthesising cells.

How far that stomata open or close is controlled by 'gaurd cells'.
Gaseous Exchange
How might root hair cells be adapted?
Root hair cells have tiny projections that increase their surface area considerably, meaning more water can be absorbed quickly. The root hair cell is also very thin, meaning the diffusion distance is short.
After the water has passed through the root hair cell by osmosis, it moves into the xylem. The xylem is very close to the root hair cell - increasing the rate of osmosis.
How have roots adapted to take minerals ions using active transport?
As water evaporates from the leaf, more water is pulled through the xylem to replace it. This is known as the 'transpiration stream'.
Why does increasing the rate of photosynthesis increase the rate of transpiration?
What conditions would increase the rate of photosynthesis, and why?
The 'phloem' moves dissolved sugars/food from the leaves to the rest of plant by 'translocation'
The 'xylem' transports minerals from the soil to the rest of the plant.
The Stem.
Structure of a leaf....
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