Water Uptake and Loss in Plants

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  • Created by: joshd
  • Created on: 15-03-14 13:40
What take in water and what by?
Root hairs take in water by osmosis.
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What do the cells on plant roots grow into and what do they do? What does each plant have?
The cells on plant roots grow into long 'hairs' which stick out into the soil. Each branch of a root will be covered in millions of these microscopic hairs.
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What do the root hairs give the plant?
A big surface area for absorbing water from the soil.
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Where is there usually and a higher concentration of water and what does this mean?
There's usually a higher concentration of water in the soil than there is inside the plant, so the water enters the root hair cell by osmosis.
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What do root hairs take in and how? (1)
Root hairs take in minerals using active transport.
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What do root hairs also absorb? Describe the concentration, and where it is higher. (2)
Minerals from the soil. But the concentration of minerals in the soil is usually pretty low. It's normally higher in the root hair cell than in the soil around it.
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What does normal diffusion not explain? (3)
Normal diffusion doesn't explain how minerals are taken up into the root hair cell.
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What is the process which is responsible (instead of diffusion), describe what it is. (4)
Active transport is responsible. Active transport uses energy from respiration to help the plant pull minerals into the root hair against the concentration gradient. This is essential for its growth.
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What are tube networks for in plants?
To move substances to and from individual cells quickly.
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What do XYLEM tubes do?
XYLEM tubes transport water and minerals from the root to the rest of the plant (e.g, the leaves)
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What do PHLOEM tubes do?
PHLOEM tubes transport sugars from the leaves (where they're made) to growing and storage tissues.
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What is transpiration?
Transpiration is the loss of water from the plant.
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What is transpiration caused by? (1)
The evaporation and diffusion of water from inside the leaves.
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What does this create? (2)
This creates a slight shortage of water in the leaf, and so more water is drawn up from the rest of the plant through the xylem vessels to replace it.
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What does this in turn mean? (3)
This in turn means more water is drawn up from the roots, and so there's a constant transpiration stream of water through the plant.
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What is transpiration? (effect) Why do leaves have to be like this? (4)
Transpiration is a side-effect of the way leaves are adapted for photosynthesis. Leaves have to have stomata in them so that gases can be exchanged easily.
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Why does the water escape from the leaves through the stomata? (5)
Because there's more water inside the plant than in the air outside.
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What does the transpiration stream provide though? (6)
The transpiration stream does provide the plant with a constant supply of water for photosynthesis.
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Other cards in this set

Card 2

Front

What do the cells on plant roots grow into and what do they do? What does each plant have?

Back

The cells on plant roots grow into long 'hairs' which stick out into the soil. Each branch of a root will be covered in millions of these microscopic hairs.

Card 3

Front

What do the root hairs give the plant?

Back

Preview of the front of card 3

Card 4

Front

Where is there usually and a higher concentration of water and what does this mean?

Back

Preview of the front of card 4

Card 5

Front

What do root hairs take in and how? (1)

Back

Preview of the front of card 5
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