Yr8 B2.8 Disruption to food chains and webs

What is meant by interdependence in a food web?

• When organisms eat the same type of food

• When living organisms depend on each other to survive, grow, and reproduce

• When plants grow next to each other

What is a population in an ecosystem?

• The number of different food chains in an area

• All the animals that eat the same food

• The number of organisms of the same type living in the same area

What happens to consumers if the producer population decreases?

• Consumer population increases

• Consumer population decreases

• Consumer population stays the same

If the rabbit population decreased due to disease, what would happen to the foxes?

• The fox population would increase

• The fox population would decrease

• The fox population would stay the same

What is bioaccumulation?

• The build-up of energy in the top predator

• The build-up of toxic chemicals in organisms along a food chain

• The storing of nutrients in a food web

Why are polar bears at risk from bioaccumulation?

• They eat only plants

• They eat seals that contain insecticides from fish

• They live near polluted rivers

Which of the following organisms is a producer in the food web on this page?

• Rabbit

• Snail

• Grass

If frogs die out, what is likely to happen to the vole population?

• It will increase

• It will decrease

• It will not change

Which of these could cause a disruption to a food web?

• A new plant being discovered

• A disease affecting one species

• A predator taking a nap

Why was the insecticide DDT banned?

• It made plants grow too fast

• It killed birds but not the fish by building up in the food chain

• It made rivers turn green