KS3 Science - Ecosystems

Organisms living in hot, dry areas are more likely to survive if they:

• wash regularly

• do not waste water

• have thick hair

• do not have sharp claws

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An ecosystem is:

• plumbing and wiring in a house that uses less water and energy than older systems

• all the different physical environmental factors that affect a habitat

• all the different types of organisms in a habitat

• All the organisms in a habitat together with the physical environmental factors.

1 At a certain lake, the community is smaller in winter because:

• some of each species of animal have died

• some species of birds have migrated

• more animals have arrived for the winter so that they can keep warm together

• there is more ice on the lake and so less room for the organisms.

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What do lizards eat?

• mice

• grasshoppers

• hawks

• grass

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What might happen if all the rabbits died?

• There would be more hawks because there are fewer rabbits in competition with them.

• There would be fewer lizards because the hawks would eat more of them.

• There would be less grass because the grasshoppers would eat it.

• There would be more snakes because they would not compete with the rabbits.

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The arrows in a food chain show:

• the flow of energy

• the loss of energy

• how animals use energy to move around in a habitat

• how plants make their own energy.

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Which of the following food chains does the pyramid of numbers represent?

• grass rabbit fox

• grass sheep fox

• lettuce slug thrush hawk

• oak tree caterpillar bird

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Using the food web, choose the organisms in the correct order.

• microscopic plants > water fleas > small fish > perch

• microscope plants > perch > water flease > small fish

• perch > waterboatmen > small fish > tadpoles

• microscopic plants > tadpoles > water boatman > perch

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What word describes the movement of many animals from one part of the world to another?

• hibernation

• changing

• tourism

• migration

What is the type of variation shown in the bar chart?

• continuous

• discontinuous

• identical

• incomplete