Transpiration and Translocation

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  • Created by: sara.5
  • Created on: 06-04-18 12:28
What is transpiration?
The flow of water into a root up the stem and out of the leaves
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What are xylem tube form?
Tiny continuous pipes leading from the plants up to its leaves
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What flows in the xylem tubes?
There is an unbroken chain of water due to the weak forces of attraction between water molecules
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What happens when water diffuses out of a leaf?
More water evaporates from the xylem into the leaf
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In which area is the concentration greater ?
The concentration of water vapour is greater in the air spaces inside a leaf the out side
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What does a bigger concentration mean?
It make the gradient stepper therfore diffusion happens faster
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What factors increase transpiration?
-Wind(moves molecules away from stomata) -Low Humidity(little water vapour in the air) -Higher temperature(particles move faster and so diffuse faster) -Greater light intensity(makes stomata wider)
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What are the adaptation of a Xylem tube
-Dead cells have no cytoplasm so forms an empty tube for water to flow in-Tiny pores let water and mineral ions enter and leave xylem vessels -Lack of cell wall between cells men that water flow is not slowed
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Another adaptation of Xylem tubes are...
Thick side walls and rings of lignin form rigid tubes that will not burst/collapse under high pressure of water and provides support
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What are the adaptation of Phloem?
Companion cells actively pump sucrose in/out of the sieve cell.- The increaseed pressur causes sucrose to flow to growign shoots or storage organs- pores allow sucrose solution to be pumped in -Holes at the end of the cell wall allow liquid to flow
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Other adaptations are...
Holes at the end of the cell wall allow liquid to flow from one sieve to the next -small cytoplasm means more room for central channel
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Other cards in this set

Card 2

Front

What are xylem tube form?

Back

Tiny continuous pipes leading from the plants up to its leaves

Card 3

Front

What flows in the xylem tubes?

Back

Preview of the front of card 3

Card 4

Front

What happens when water diffuses out of a leaf?

Back

Preview of the front of card 4

Card 5

Front

In which area is the concentration greater ?

Back

Preview of the front of card 5
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