The organism in the environment; feeding relationships; cycles within ecosystems; human influences on the environment.
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What does the term 'population' mean?
What does the term 'community' mean?
Name 4 things animals compete over and 4 things plants compete over in ecosystems.
What are trophic levels?
In what ways is energy lost between the trophic levels?
Sketch the carbon cycle, complete with the processes that move carbon from one state to another.
In which major biological molecules is nitrogen present in?
Sketch the nitrogen cycle, complete with labels for all the processes that move nitrogen around.
What is putrefaction?
What is nitrification?
What two types of nitrogen fixing bacteria are there and what do they do?
What do denitrifying bacteria do?
What is transpiration?
Why do farmers need to use fertilisers?
What is the role of lightning in the nitrogen cycle?
Name one benefit and one problem with inorganic fertilisers.
Name two ways in which pest numbers are controlled.
Name two problems with the use of pesticides.
Explain what monoculture is, what the problem with it is, and what process can counteract this problem.
Name 6 methods of biological control.
What are the advantages of fish farming?
What are the disadvantages of fish farming?
Define pollution
What gases do we pollute the air with?
Which pollutant gases cause acid rain?
Name 3 indicator species of organic water pollution.
Explain how rapid eutrophication leads to anoxic conditions and the death of many of the species in the water.
What is bioaccumulation?
What is DDT?
What is biomagnification?
Define 'ecosystem'
How would you use a quadrat to sample from an area?
What are the limitations of food webs?
Describe the relationship between a legume plant and nitrogen fixing bacteria.
How can soil be made:
i) more acidic?
ii) more alkaline?
Why are plants sometimes grown in a hydroponic culture?
By how much has the level of carbon dioxide in the atmosphere increased over the last 100 years?
What has caused the rise in CO2 levels over the past 100 years?
What will be the likely effects of global warming?
What is an indicator species for levels of sulphur dioxide pollution?
What are the effects of acid rain on living organisms?
