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12 Cards in this Set
- Front
- Back
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What is osmosis?
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The movement of water molecules from an area of high to low water concentration across a partially permeable membrane.
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Give two examples of diffusion in the body.
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1. Alveoli in the lungs
2. Villi in the small intestine |
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What is active transport?
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The movement of a substance against a concentration gradient.
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How are root hair cells specialised for absorbing water and minerals?
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Long hairs for a big surface area.
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How does active transport occur in root hair cells?
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The concentration of minerals is higher therefore they move from a dilute solution to a concentrated solution inside.
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What does active transport need to make it work?
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Energy from respiration.
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Give an example of the use of active transport in the body.
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From a low to high concentration of nutrients in the gut.
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What is transpiration?
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The loss of water from a plant (evaporation or diffusion).
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What do phloem tubes transport?
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Food in the form of dissolves sugars in both directions.
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What do xylem tubes transport?
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Water and minerals from the roots to the stem and leaves in the transpiration stream (up).
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What is a transpiration stream?
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Constant water drawn up from the roots up the plant.
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How are surfaces adapted to maximise these?
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1. thin
2. large surface area 3. ventilated 4. lots of blood vessels |
