B4

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  • Created by: apple87
  • Created on: 11-03-14 18:20
What is population?
All of the organisms of one species in a habitat
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What is a community?
Population of different species in a habitat.
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What formula do you use to estimate population size using the capture and recapture method?
(Number in first sample x number in second sample) / number in second sample previously marked
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What is zonation?
The gradual change in te distribution of species across a habitat.
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What is biodiversity?
A measure of the variety of life in a area.
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What is glucose converted into in plants?
For respiration, Cells walls, Stored in seeds, starch, proteins
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What is diffusion?
The net movment of particles fram and area of higher concentration to an area of lower concentration.
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What is osmosis?
The net movement of water molecules across a partially permeable membrane from a region of higher concentration to a region of lower concentration
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What does the phloem tube do?
Transports food up and down called translocation
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What does the xylem vessel do?
Transports water up. MAde of dead cells.
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What is transpirstion increased by?
Light intensity, air pressure, air movement, air humidity gets yellow older leaves
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What three main minerals do plants need?
Nitrates- amino acids, proteins Phosphates- respiration and growth has poor root growth and discoloured older leaves Potassium- helps the enzymes needed for photosynthesis and respiration. Poor flowe and fruit growth, discoloured leaves.
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What factors affect decay?
Temperature, amount of water amount of air, oxygen
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What are the problems of intensive farming?
Destroys natural habitats, eutrophication, distrubs food chains, battery hens- ethical issues.
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What is hydrophonics?
Plants are grownin nutrient soloutions instead of in soil. Often used for greehouse tomatoes on a commercial scale.
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What are the problems of biological control?
Predator could eat usful species, not each the anials you want it to, get out of control, might not stay in the area
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What are the alternatives to intensive farming?
Organic fertilisers, crop rotation, weeding, varying seed planting times, biological control.
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What are the problems with organic farming?
Takes up more space, more labour intensive, can't grow as much.
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What do plants need magnesium for and what happens if they don't get enough?
Chlorophyll which is needed for photosynthesis. Plants without enough magnesium have yellow leaves
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What does the stomata do?
Automatically closes when water from the roots starts to dry up.
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How does the stomata work?
The cells go eithe turgid to open of flaccid to close
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What four factors increase transpiration rate?
Increase in light intensity. Increase in air movement. Increase in tmeperature. Decrease in air humidity
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Other cards in this set

Card 2

Front

What is a community?

Back

Population of different species in a habitat.

Card 3

Front

What formula do you use to estimate population size using the capture and recapture method?

Back

Preview of the front of card 3

Card 4

Front

What is zonation?

Back

Preview of the front of card 4

Card 5

Front

What is biodiversity?

Back

Preview of the front of card 5
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