Transport In Plants
- Created by: Rebecca Mc
- Created on: 24-04-17 19:41
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- Transport In Plants
- Transpiration
- Open stomata lets out the carbon dioxide
- To produce glucose
- Put lets out a lot of water
- Higher concentration inside the leaf than outside
- Potermeter can be used to measure rate of transpiration
- A consequence of gas exchange
- Main factors
- Light
- Light opening up the stomata
- More light equals to fast transpiration rate
- Light opening up the stomata
- Humidity
- Lower humidity, the faster the transpiration
- Air around the plant is dry
- So the water potential gradient between the leaf and air increases
- Increasing transpiration
- So the water potential gradient between the leaf and air increases
- Air around the plant is dry
- Lower humidity, the faster the transpiration
- Wind
- blows water off the stomata
- Due to an increase in water potential
- The more windier, the faster the transpiration rate
- Temperature
- Higher temperature, faster rate of transpiration
- More energy, evapouration
- Light
- Open stomata lets out the carbon dioxide
- Xerophyte Plants
- Sunken stomata into pits
- Shelter from wind
- Hairs to trap moisture
- Reducing water potential gradient
- Rolling of the leaves
- Trapping moisture
- Thick, waxy layer
- Which is waterproof
- Cacti closing their stomata's
- In very hot temperatures
- Spines of cacti to reduce surface area
- Sunken stomata into pits
- Hydrophilic Plants
- Stomata only present on upper surface
- Floating leaves
- Maximus gas exchange
- Flexible leaves and stems
- Prevent damage by water currents
- Air spaces in tissue
- To help floating
- Storage of Oxygen
- Stomata only present on upper surface
- Translocation
- Source to sink
- Movement of dissolved substances (assimilates)
- Energy requiring proces
- Phloem
- Companion cell transports H+ ions between the source and the sink
- How substances enter the phloem
- Active loading
- Mass Flow Hypthesis
- Active transport loads sucrose into sieve tubes
- Water potential decreases
- Water enter by osmosis from xylem to companion cell
- At the sink, sugars are removed from the phloem to be used up
- Increasing the water potential inside sieve tubes
- water leaves by osmosis
- the result is a pressure gradient from the source to the sink
- This gradient pushes sugar along the sieve tube to where they are needed
- Increasing the water potential inside sieve tubes
- At the sink, sugars are removed from the phloem to be used up
- Active transport loads sucrose into sieve tubes
- Transport of water
- Moving through the root into the xylem
- Osmosis
- Moving from high water potential to a lower water potential
- Osmosis
- Moving through the root into the xylem
- Transpiration
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