Biosphere

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What are the three main parts of an ecosystem?
Habitat, Population, Community and Ecosystem
1 of 33
Name a method of sampling plants
Quadrat
2 of 33
Errors using a quadrat
Quadrat can be placed on interesting piece of ground- biased results.
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Name a method of sampling invertebrates
Pitfall Trap
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Errors using a pitfall trap
Invertebrates could be eaten
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What is an abiotic factor?
A non-living aspect of the environment which has an affect on organisms
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Give three abiotic factors
Any of: light intenstity, temperature, pH, soil moisture
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How do you measure light intensity and soil moisture?
Using a light meter and moisture meter.
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Precautions when using a light meter
Do not lean over the light meter otherwise light will be obstructed. Carry out measuremets at the same time of day.
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Precautions when using a moisture meter
Push the probe in the ground the same depth and wipe the probe with a tissue after a measurement is taken.
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What is habitat?
A place where an organism lives
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What is a population?
All the members of a particular species living in an ecosystem
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Green plants make food via photosynthesis, what are they?
Producers
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Organisms that only eat plants are?
Herbivores
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Organisms that only eat other organisms are?
Carnivores
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Organisms that eat both plants and other organisms are?
Omnivores
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What is the name for a more complex food chain?
Food web
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What do the arrows in a food chain indicate?
Energy flow
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Name three ways energy can be lost from a food chain
Heat, movement and faeces
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How much energy is passed on in a food chain?
10%
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What does a pyramid of numbers show?
The change in numbers in a food chain.
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What does a pyramid of biomass show?
The change in mass in a food chain.
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What are main factors which limit population growth?
Lack of food, lack of space, disease and predators
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Why does competition occur?
Because organisms need the same resources
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Name four things organisms compete for.
Food, water, space and light (in the case of plants)
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Where are nitrogen fixing bacteria found?
In nodules of the roots of leguminous plants.
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Describe the nitrogen cycle
Refer to bible.
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What pollutes the sea?
Oil, sewage, fertilizers, pesticides and other chemicals.
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What are the three main sources of pollution?
Domestic, agriculture and industry.
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What happens when soot covers the leaves of plants?
Less photosynthesis
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State two ways pollution can be controlled
Filters on chimneys, treating sewage.
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What is an indicator species?
Organisms who's presence or absence tells us something about the state of the environment.
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State a way we can improve crop fertility.
Crop rotation
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Other cards in this set

Card 2

Front

Name a method of sampling plants

Back

Quadrat

Card 3

Front

Errors using a quadrat

Back

Preview of the front of card 3

Card 4

Front

Name a method of sampling invertebrates

Back

Preview of the front of card 4

Card 5

Front

Errors using a pitfall trap

Back

Preview of the front of card 5
View more cards

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