a) Pesticides
Monocultrue: Where there are large fields of crops all of the same type
Monoculture --------> Pests crop food sources
This reduces productivity of farming. Loss of food and money.
Pesticides are chemicals which re designed to kill pests.
Advantages:
Chemicals are easy to obtain
They are easy to apply
3. Very effective
Disadvantage:
1. Toxic (will kill other plants and animals and harmful to humans)
2. Bio-accumulation (the pesticide builds up through the food chain cause problems for other animals)
3. Mutation in the pest often leads to resistance, meaning the concentration has to be constantly added till it no longer works and needs to be replaced.
B) Biological control
Biological control is a way of reducing the population of a pest without using pesticides.
Another alien species has to be brought in that is higher in the food chain, to reduce the numbers of the population of the plant or animal
Advantages
1. Not toxic
2. Smaller impact on life
Disadvantages
1. Doesn't always work
2. Hard to control
3. The alien species could become unwanted
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