Term
| Why is the demand for food increasing? |
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Definition
| the global population is increasing |
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Term
| Name two types of chemical that farmers can use to increase crop yield. |
|
Definition
| fertilisers and pesticides |
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Term
| What compounds do fertilisers contain ? |
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Definition
|
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Term
| How do pesticides increase crop yield? |
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Definition
| they kill organisms that compete with crops or eat crops. |
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|
Term
| What do plants use nitrates to make? |
|
Definition
|
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Term
| How do animals get amino aids to make protein? |
|
Definition
| by eating protein containing plants / animals |
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Term
|
Definition
| fertiliser leaching into water ways and increasing growth of algae |
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|
Term
| What is the effect of algal bloom on the other aquatic plants? |
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Definition
| the algal bloom blocks out the light which kills them |
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Term
| What increases as a result of the increase in dead plant matter in the water? |
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Definition
|
|
Term
| What effect do the bacteria have on the water? |
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Definition
|
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Term
| What is reduced as a result of the lack of oxygen? |
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Definition
| aquatic animals / indicator species / biodiversity |
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|
Term
| What does the term bioaccumulation mean? |
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Definition
| build-up of toxic substances in living organisms |
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|
Term
| What are the alternatives to using pesticides? |
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Definition
| biological control and GM crops |
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Term
| What is the advantage of growing a crop that is genetically modified to absorb nitrates more effectively? |
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Definition
| can reduce the use of fertilisers |
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