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WorksheetsEcosystem and Human Influence
Total questions: 20
Worksheet time: 10mins
Which process may result in eutrophication in a lake?
A bleach entering from a factory
B fertilisers entering from farmland
C hot water entering from a power station
D pesticides entering from farmland
Over-use of fertilisers on farmland causes the chemicals in the fertilisers to be washed into ponds and lakes.
This causes eutrophication resulting in the following events.
1 algae grow
2 fish die
3 bacteria grow
4 oxygen decreases
What is the correct sequence of these events?
A 1 → 3 → 4 → 2
B 1 → 4 → 3 → 2
C 3 → 4 → 2 → 1
D 4 → 1 → 2 → 3
Which of this natural resource was used as fuel?
Rock
Shell
Wood
Skins
What was the skins used for?
building material
clothes
containers
knives
Forest fire can cause ... pollution.
water
air
land
sound
Those fish in the picture were killed because of ... in the river.
alga bloom
fertilisers
phosphate
PCB
Seawater can be polluted by ....
oil
fertiliser
fish
pesticide
Intensive farming requires the use of ....
fertiliser and pesticide
fertiliser and machine
fertiliser and manure
fertiliser and sewage sludge
Where does the food chain START?
with consumers that eat grass
with the sun giving energy to producers
with the sun giving energy to consumers
with consumers eating other consumers
Which of the following are factors that could cause extinction?
Destruction of animals' habitat
Climate change
Pollution
Increased human population (more people)
ALL of the above could cause extinction
Breaks down and feeds on the remains of other organisms
decomposer
consumer
producer
An oak tree is a/an...
Producer
Primary Consumer
Secondary Consumer
Decomposer
Look at the diagram of the food web. The arrows means “eaten by.”
What will happen if the number of snakes goes down?
The owl will eat the grass
The number of frogs will go down
The hawk and owl will have less food
The number of mice and grasshoppers will go up.
