click below
click below
Normal Size Small Size show me how
BIOLOGY
UNIT 3 KA 5-6
Question | Answer |
---|---|
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 |