4th Science Ch.4 Test

Which word means all living and nonliving things that exist and interact in a place?

• ecosystem

• nutrient

• pollutant

• producer

What happens during recycling?

• materials stay the same

• materials are washed and cleaned

• materials are broken down and used again

• materials are moved to a different place

Living things that eat dead organisms are called

• decomposers

• predators

• producers

• scavengers

Living things that break down the remains of dead organisms are called

• carnivores

• composers

• decomposers

• producers

Where would materials decay the fastest?

• cold, dry environments

• warm, dry environments

• cold, moist environments

• warm, moist environments

What do microorganisms do in compost piles?

• They turn rocks into diret

• They turn food into rocks

• They break down living matter

• They make matter

Putting harmful materials into the environment is called

• erosion

• disposal

• garbage

• pollution

People change the environment by

• reusing plastic materials

• recycling cans and bottles

• building houses and roads

• saving water

What is a biodegradable material?

• synthetic material

• hard plastic that can be crushed

• matter that does not break down easily in the enviornment

• matter that breaks down easily in the environment

What material would not break down very well in a landfill?

• a banana peel

• a dead fish

• a leaf

• a plastic bag