B4

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How do molecules move in and out of a membrane?
Molecules move in and out of cells by diffusion through the cell membrane.
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Define diffusion?
Diffusion is the net movement of particles from a region of high concentration to a region of low concentration, as a consequence of the random movement of individual particles.
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How does water move in and out of cells?
Water moves in and out of cells by osmosis through the cell membrane.
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Define osmosis?
Water moves in and out of cells by osmosis through the cell membrane.
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What does the plant wall do?
The plant cell wall provides support.
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If the plant lacks water what would happen to the plant?
Lack of water can cause plant to wilt.
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What xylem vessels?
Xylem vessels are the site of the transpiration stream: the movement of water and minerals from the roots to the shoot and leaves.
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What are phloem?
Phloem is the site of translocation: movement of food substances (sugar) up and down stems to growing and storage tissues.
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What is transpiration?
Transpiration is the evaporation and diffusion of water from inside leaves.
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Name some factors that increase transpiration?
increase in light intensity,temperature, air movemnt and a decrease in humidity
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What does transpiration provide plants with?
Transpiration provides plants with water for cooling, photosynthesis, support and movement of minerals.
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How do root hairts benefit a plant?
Root hairs increase the ability of roots to take up water by osmosis by increasing the surface area of the roots
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What minerals do fertilisers contain?
Fertilisers contain minerals such as nitrates, phosphates, potassium and magnesium
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What is a NPK value?
NPK values show the percentage of the fertiliser that is nitrates, phosphates and potassium.
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What are nitrates needed for?
Nitrates (nitrogen) are used to make amino acids. Nitrates are needed for cell growth
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What are phospates needed for?
Phosphates (phosphorus) are used to make DNA and cell membranes and are needed for respiration and growth
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What is pottasium needed for?
Potassium compounds (potassium) are used to help enzymes ,Potassium compounds are needed for respiration and photosynthesis
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What is magnesium needed for?
Magnesium compounds (magnesium) are used to make chlorophyll , and are needed for photosynthesis.
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What are microorganisms?
The presence of microorganisms is required for the process of decay,Microorganisms are used to break down human and plant waste
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What are detritivores?
Detritivores are animals that eat dead and decaying plants
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How do detritivores increase the rate of decay?
Detritivores increase the rate of decay by producing a larger surface area
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Name some examples of detritivores?
Maggots, earthworms and woodlice
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What are Saphrophytes ?
Saphrophytes are organisms that feed off dead and decaying material,Saphrophytes digest material by releasing enzymes onto the food to break it into simple, soluble substances
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What is intensive farming?
Intensive farming means trying to produce as much food as possible from the land, plants and animals available
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Hydroponics is growing plants without soil , name some examples of hydroponics?
Examples of hydroponic uses include glasshouse tomatoes and plant growth in areas of barren soil
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What is organic farming?
organic farming does not use artificial fertilisers or pesticides
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Other cards in this set

Card 2

Front

Define diffusion?

Back

Diffusion is the net movement of particles from a region of high concentration to a region of low concentration, as a consequence of the random movement of individual particles.

Card 3

Front

How does water move in and out of cells?

Back

Preview of the front of card 3

Card 4

Front

Define osmosis?

Back

Preview of the front of card 4

Card 5

Front

What does the plant wall do?

Back

Preview of the front of card 5
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