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UNIT 3 KA 5-6

What is a Fertilisers? Fertilisers are chemical that are applied to plants to encourage growth & increase their yield.
What is a problem a fertiliser can cause? Algal bloom.
What is Eutrophication? Eutrophication is a serious problems caused by water pollution.
What is Pesticides? A pesticide is a substance used to prevent, destroy or repel pests.
What are the different types of Pesticides? Insecticides - Herbicides - Fungicides
What is a problem Pesticides can cause? Pesticides sprayed on crops can be accumulate in the bodies of organisms over time. This can lead to death levels.
What can Genetically modified crops can be used to do? Increase crop yield - Reduce the use of fertilisers - Reduce the use of pesticides
Examples of GM Crops? Golden rice - GM Tomatoes
What is a Biological control? Biological control involves using organisms such as natural predators or parasites to control pest numbers.
What is Mutations? Mutations is a random change to genetic material.
What is an allele ? Different form of the same gene
Why is variation important? makes it possible for a population to involve over time in response to changing environmental conditions
What is an adaptation? An adaptation is an inherited characteristic that makes an organism well suited to survival in its environment
What is an example of an adaptation? Camel's have two sets of eyelashes to help keep out the sand
What is Natural selection? This is when every species of living organisms have an enormous reproductive potential
What are the 3 selection pressures? Predation - Disease - Food available
What is Speciation? Is the Formation of a new species (occurs after a part of the population becomes isolated)
What can an Isolation barrier be? Geographical- Rivers/deserts/Sea Ecological- Differences in Temp/Humidity or PH
What are the 4 steps that lead onto one another? Isolation - Mutation - Natural Selection - Different Species Formed
Created by: Emilylogue67
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