4th Grade Chapter 4 Test

What happens during recycling?

A. Materials stay the same

B. Materials are washed and cleaned

C. Materials are broken down and used

again

D. Materials are moved to a different place

Living things that eat dead organisms are called…

A. Decomposers

B. Predators

C. Producers

D. Scavengers

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

A. Carnivores

B. Composers

C. Decomposers

D. Producers

What do microorganisms do in the compost piles?

A. They turn rock into dirt

B. They turn food into rocks

C. They break down living matter.

D. They make matter

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

A. A banana peel

B. A dead fish

C. A leaf

D. A plastic bag

The process of breaking down materials into a different form that

can be used again is called _____________________.

Nutrient Recycling

A(n) __________ is a living thing that breaks down the

remains of dead organisms.

Decomposer

A(n) __________ is an animal that feeds on the remains or

wastes of dead animals.

Scavenger

__________ is decayed material from once-living

things that is used to enrich the soil.

Compost

__________ is trash that is not disposed of in a way that

prevents harm to ecosystems.

Litter

__________ is the addition of harmful materials to the

environment.

Pollution

A material that causes pollution is called

a(n)________.

Pollutant

A waste that can pollute the environment even when it occurs in very small amounts is called

a(n) ___________.

Hazardous Waste

A(n) _________ is matter that breaks down easily in the

environment.

Biodegradable material

_________ involves travel to natural habitats that avoids harming and helps preserve

these areas.

Ecotourism

What do scavengers eat?

Scavengers eat what is left by predators

Label this organism as a…

A. Scavenger

B. Carnivore

C. Decomposer

D. Omnivore

How does recycling nutrients help many types of plants in

an ecosystem?

Recycling nutrients enriches the soil

How can materials such as weed killers and pesticides

cause pollution?

Materials such as weed killers and pesticides can wash off plants and seep into the soil

Tell what would happen if decomposers were the end of

all food chains.

The remains of dead organisms would not be broken down into simpler materials. Space in the environment would not be freed

up.

Look at the graph. If plastics, metals, glass, paper and cardboard

were recycled, what percent of garbage would be recycled?

•60%