Are used to kill harmful insects or organisms to protect the well-being of other plants or animals. Examples of pesticides are herbicides, fungicides and insecticides.
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Disadvantages of pesticides
They enter and accumulate in food chains, causing lethal doses to predators / They can harm other organism living nearby which are NOT pests / Some take a long time to break down and become harmless
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Organic farming
Avoids expensive artificial fertilisers and pesticides but crops are often very small and the produce is often very expensive.
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Biological control
Uses living organisms to control pests; it acts as an alternative to pesticides. For example, many gardeners will introduce ladybirds to their gardens to kill off any aphids which feed on and damage plants.
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Advantages of biological control
Avoids the use of artificial insecticides, as living organisms are used, they generally do not need to be replaced.
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Disadvantages of biological control
The new (introduced) species often eat other useful species, rather than just the pest / Introducing a new species into a habitat to kill another species can affect the food sources of other organisms in a food web, causing unexpected results
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Intensive farming
Makes use of artificial pesticides and fertilisers.
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Advantages of intensive farming
Very efficient in producing high crop yield and does this cheaply
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Disadvantages of intensive farming
Animals are kept in very small spaces / Concerns about the effects of extensively using chemicals on soil structure and other organisms
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Hydroponics
A type of intensive farming that is generally used in areas where there is little rainfall or barren soil.
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Hydroponics
Plants grown without soil using a regularly recycled flow of aerated water (water with air) containing minerals, which usually takes place in glasshouses or polytunnels.
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Advantages of hydroponics
Hydroponic farmers have better control over mineral levels and disease – they can manipulate the mineral levels to increase productivity / Many plants can be grown in one (relatively) small space
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Other cards in this set
Card 2
Front
They enter and accumulate in food chains, causing lethal doses to predators / They can harm other organism living nearby which are NOT pests / Some take a long time to break down and become harmless
Back
Disadvantages of pesticides
Card 3
Front
Avoids expensive artificial fertilisers and pesticides but crops are often very small and the produce is often very expensive.
Back
Card 4
Front
Uses living organisms to control pests; it acts as an alternative to pesticides. For example, many gardeners will introduce ladybirds to their gardens to kill off any aphids which feed on and damage plants.
Back
Card 5
Front
Avoids the use of artificial insecticides, as living organisms are used, they generally do not need to be replaced.
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