Torlands KS3 Interdependence End of Topic Test

The diagram shows the feeding relationships in a

meadow.

The population of grasshoppers decreases.

Explain what will happen to the population of

lizards.

• The population of grasshoppers will increase

• The population of lizards will increase

• The population of lizards will decrease

• The population of grasshoppers will decrease

Mice eat seeds. Barn owls are predators of mice.

Explain one reason why farmers like to have barn

owls on their land.

• The mice will eat the owls.

• The barn owls eat mice, so there are more mice to eat the seeds from the farmer’s plants.

• The owls will eat the seeds so the plants will not grow.

• The barn owls eat mice, so there are less mice to eat the seeds from the farmer’s plants.

Overfishing of Atlantic sea cod has led to a rapid

decrease in their numbers.

Use the food web to explain why this may cause a

decrease in the number of squid.

• There will be less squid as the zooplankton are eating it.

• Cod eat Leopard Seals. Less cod means there will be more leopard seals.

• Leopard seals eat cod and squid. Less cod means leopard seals will need to hunt more squid.

• There will be a decrease in squid because more elephant seals will eat them.

Abiotic factors are...

• New predators

• Oxygen levels

• Number of prey

• New disease

Biotic factors are....

• Light Levels

• Average temperature

• Amount of nutrients in the soil

• Number of predators

The images show a forest at the start and end

of May.

Small plants grow on the woodland floor.

Explain why their growth is faster at the start

of May.

• They are able to get more light

• They are able to get more space

• They are able to get more water

• They are able to get more food

A gardener grows lettuce in a greenhouse and some is eaten by caterpillars. The level of carbon dioxide gas increases when gardener installs a gas burner. Which population will this affect?

• Only the plants

• Only the caterpillars

• Both plants and caterpillars

Monarch butterflies feed on nectar from milkweed plants.What will happen to the plant population if the number of monarch butterflies falls?

• It increases because butterflies eat the plants

• It decreases because butterflies give the plants energy

• It decreases because the plants reproduce slower

In an ocean food web, amphipods eat copepods and shrimps. Copepods and shrimps eat dinoflagellates. Shrimps also eat copepods.Which organisms are producers?

• Amphipods

• Copepods

• Dinoflagellates

Here is one of the food webs in a lake.

Name two animals that compete for food.

• Gulls and Osprey

• Gulls and phytoplankton

• Gulls and Wading birds

• Gulls and small fish