P4 Science · Chapter 20brightbit.net/worksheets
Ecosystems and Conservation
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
What is an ecosystem?
(a) Only the living organisms in a particular area(b) A community of living organisms interacting with each other and their non-living environment(c) Only the non-living parts of an environment (air, water, soil)(d) A system of rivers and lakes
- 2.
What is biodiversity?
(a) The number of individual animals in an ecosystem(b) The variety of different species of living organisms in a given area(c) The total mass of all living organisms in an ecosystem(d) The ability of organisms to adapt to changing conditions
- 3.
Which of the following human activities MOST directly threatens biodiversity?
(a) Recycling paper and plastic(b) Deforestation and habitat destruction(c) Using solar panels for electricity(d) Building underground railways
- 4.
What is a decomposer, and why is it important in an ecosystem?
(a) An animal that eats only plants; it transfers energy up the food chain(b) A microorganism that breaks down dead matter, recycling nutrients back into the soil(c) A predator that sits at the top of the food chain(d) A plant that produces food by photosynthesis
- 5.
What is the greenhouse effect, and how does it relate to global climate change?
(a) The greenhouse effect cools the Earth; increasing greenhouse gases causes ice ages(b) The natural greenhouse effect keeps Earth warm; enhanced greenhouse effect due to human activities is causing the Earth to warm up (global warming)(c) The greenhouse effect only affects plants in greenhouses(d) The greenhouse effect is caused by the hole in the ozone layer
- 6.
What is the difference between a habitat and an ecosystem?
(a) They are the same thing(b) A habitat is the specific place where an organism lives; an ecosystem is the community of organisms AND their environment(c) A habitat includes both living and non-living things; an ecosystem includes only living things(d) An ecosystem is smaller than a habitat
- 7.
Why is it important to conserve endangered species?
(a) Endangered species are usually dangerous to humans(b) Each species plays a role in its ecosystem; losing a species can destabilise the ecosystem and reduce biodiversity(c) Endangered species produce valuable medicines only(d) Conservation only matters for economically important animals
- 8.
Which of the following is an example of sustainable use of resources?
(a) Cutting down all trees in a forest to maximise timber production(b) Fishing using methods that only catch adult fish and allow young fish to grow and reproduce(c) Extracting all available oil from an oil field as quickly as possible(d) Building factories in wetland areas to reduce production costs
- 9.
State TWO ways humans can help protect biodiversity and ecosystems.
- 10.
A coral reef ecosystem is being damaged by rising sea temperatures and pollution. Explain TWO consequences of the coral reef's destruction for other organisms.
Answer key — P4 Science: Ecosystems and Conservation
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(b) A community of living organisms interacting with each other and their non-living environment
- 2.(b) The variety of different species of living organisms in a given area
- 3.(b) Deforestation and habitat destruction
- 4.(b) A microorganism that breaks down dead matter, recycling nutrients back into the soil
- 5.(b) The natural greenhouse effect keeps Earth warm; enhanced greenhouse effect due to human activities is causing the Earth to warm up (global warming)
- 6.(b) A habitat is the specific place where an organism lives; an ecosystem is the community of organisms AND their environment
- 7.(b) Each species plays a role in its ecosystem; losing a species can destabilise the ecosystem and reduce biodiversity
- 8.(b) Fishing using methods that only catch adult fish and allow young fish to grow and reproduce
- 9.creating nature reserves and reducing pollution
- 10.loss of habitat for fish and other marine organisms; disruption of food chains as coral reef fish disappear affecting predators that rely on them
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