The Science of Food Webs

What do all living things depend on?

• Water

• Plants

• Soil

• Sunlight

What process do plants use to make their food?

• Fermentation

• Photosynthesis

• Digestion

• Respiration

What do plants need to perform photosynthesis?

• Carbon dioxide, oxygen, and sunlight

• Carbon dioxide, water, and sunlight

• Oxygen, soil, and water

• Nitrogen, water, and sunlight

What is the role of decomposers in the food web?

• They make sunlight

• They break down dead material

• They eat plants

• They produce oxygen

What is a primary source of food for many animals?

• Plants

• Water

• Other animals

• Minerals

Why are plants important for the oxygen we breathe?

• They produce oxygen

• They store oxygen

• They filter oxygen

• They use oxygen

What would happen if there were no plants?

• The soil would erode

• Animals would have too much oxygen

• It would rain more often

• There would be no life

What do animals exhale that plants need?

• Oxygen

• Nitrogen

• Carbon dioxide

• Hydrogen

Where does most photosynthesis on Earth occur?

• In forests

• In the ocean

• On mountains

• In deserts

What is at the bottom of the food pyramid?

• Big animals

• Plants

• Small animals

• Humans