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Pollution
What you should know.
- Pollution is when humans
put harmful chemicals or energy into the environment.
- Some plants are sensitive
to sulphur dioxide in the air (pollution indicators).
- Some countries spray lime
onto lakes to neutralise the effects of acid rain.
- The numbers of
individuals in a food chain can be shown in a pyramid of numbers.
- Pesticides are used to
control insects, weeds and moulds because they destroy crops.
- Poisonous chemicals can
increase in concentration along food chains.
- Biological control is an
alternative to the use of pesticides.
- Microbes that rot dead
things are called decomposers.
- Decomposition replaces
the nutrients in the soil when animals and plants die.
- The 3 most important
nutrients for plants are nitrogen, phosphorus and potassium.
- Extra nutrients in the
water make algae grow fast. This can cause pollution.
- The advantages and
disadvantages of using fertiliser.
- Some animals can survive
pollution and breed to increase their offspring.
In this section we look at different types of pollution and what causes it.
We will also try to work out how to prevent it too!
What you should be able to
do.
- Match a range of
pollutants with their effects upon the environment.
- Plan an investigation on
how acid rain affects the growth of cress seeds.
- Discuss how pesticides
could be made safe and effective.
- Plan an investigation to
find out the best concentration of pesticide to use.
- Identify the processes
involved in a nutrient cycle diagram.
- Describe the advantages
of both organic and chemical fertilisers.
- Find out the effect of
detergent on the growth of algae.
- Use freshwater animals to
see how much pollution there is in the water.
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