WJEC GCSE Biology 2 Human Impact on the Environment

human Impact on the environment etc etc...

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  • Created on: 22-05-12 17:03
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Biology Revision Notes:
Human Impact on the Environment
This graph shows the
population increasing gradually from
1000 to 1800
After 1800, it begins
increasing rapidly and continues to
do so until 2000 (and afterwards)
Human Effects on the Environment-
Pollution of waterways and air chemical, heat, light and noise pollution
Harmful chemicals made which can't be decomposed
Destruction of animal habitats leading to endangered and extinct animals
Environment Impact Assessment:
Several rules when building houses/ roads etc.
Must consider wildlife/ pollution/ ancient monuments
Must protect rare species e.g. SSSI will have stricter building regulations
Area must be landscaped if quarrying is included
To maintain biodiversity
Water Pollution:
Water pollution caused by waste disposal, untreated sewage etc.
Too much to be decomposed by natural processes
Encourages bacteria to multiply, which then use all the oxygen in the water
Disease causing microbes may contaminate the water and encourage water spread diseases,
such as cholera and typhoid
This makes it dangerous to eat animals coming from the water source
Fertilisers from agriculture (washed into waterways by the rain) or nitrates found in sewage
(discharged into rivers etc.) fertilise microscopic plants in the water. This could lead to algae
bloom (sudden growth in algae population).
The algae will then prevent light from reaching the plant life at the bottom of the lake/ river
These plants die and decompose, allowing bacteria to multiply.
The bacteria uses up oxygen and fish and other water animals die due to lack of oxygen.

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Pesticides, also used in agriculture, can have different
negative effects on the environment:
If microscopic organisms, usually in water, consume a
small amount of these chemicals, it won't be harmful,
however, they cannot digest them as they can normal
An animal- such as a small fish- above the microscopic
organisms would consume a large amount of its prey, and
therefore a large amount of the chemical pesticide
There is therefore a higher concentration of chemical in
that fish than…read more

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Biological Control and Alien Species:
Instead of using pesticides, organic farmers use biological control to protect crop against pests. This
method does not use chemicals and therefore has fewer environmental disadvantages. This is often
used when an alien species is introduced and becomes an invasive species:
Alien species- This is a species which has been introduced to a country where it does not grow
natively- often introduced by man.…read more

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Sustainability is important to prevent animals from extinction and maintain biodiversity; this includes
less deforestation, stricter building regulations etc.…read more



A beautifully presented set of notes with lots of key detail covering human impact on the environment. These would be useful to any student needing to know about sustainability, pollution and eutrophication. Try teaming these up with a set of flashcards and a quiz for a complete set of useful resources.

Travis lord

I'm am intelligent

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