Micro-organisms and Decay Quiz

Where do micro-organisms live?

• Only on our skin

• Only in soil

• In the air, soil, water, on our skin, and inside our bodies

• Only in water

What can one teaspoon of soil contain?

• One million bacteria

• One thousand million bacteria

• One hundred bacteria

• One billion bacteria

What happens to an apple when micro-organisms grow on it?

• It turns into juice

• It goes bad

• It becomes sweeter

• It becomes larger

What is organic matter?

• A type of soil

• A chemical compound

• A substance made from living organisms

• A type of bacteria

How do micro-organisms help the environment?

• By producing oxygen

• By making food decay

• By breaking down dead bodies and animal waste

• By creating new plants

What do micro-organisms return to the soil?

• Light

• Air

• Nutrients

• Water

What is a nuisance caused by micro-organisms?

• They make our food decay

• They clean the environment

• They produce energy

• They help plants grow

What are the spots on a decaying apple?

• Water droplets

• Bacteria

• Fungi colonies

• Nutrient deposits

What is the role of micro-organisms in decay?

• They break down organic matter

• They make things grow faster

• They prevent decay

• They create new organisms

What is the main benefit of decay by micro-organisms?

• It returns nutrients to the soil

• It increases the size of plants

• It makes food taste better

• It creates pollution