Exploring Energy in Food Webs

Which of the following is always a producer in a food web?

• Grass

• Rabbit

• Hawk

• Mushroom

What term describes organisms that break down dead material and recycle nutrients back into the ecosystem?

• Producers

• Consumers

• Decomposers

• Herbivores

Tags

NGSS.MS-LS2-3

Which of the following best describes the role of a primary consumer in a food web?

• Eats only producers

• Eats only decomposers

• Eats only carnivores

• Eats only omnivores

Tags

NGSS.MS-LS2-2

What happens to the amount of available energy as you move up each trophic level in a food web?

• It increases

• It stays the same

• It decreases

• It disappears completely

Tags

NGSS.MS-LS2-3

Which of the following organisms is most likely to be found at the top of a food web?

• Grass

• Mouse

• Snake

• Hawk

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

Given a simple food web: Grass → Grasshopper → Frog → Snake, which organism is the secondary consumer?

• Grass

• Grasshopper

• Frog

• Snake

If a disease reduces the population of decomposers in an ecosystem, what is the most likely immediate effect?

• Increase in producer population

• Accumulation of dead organic matter

• Decrease in consumer population

• Increase in available energy

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A food web contains the following organisms: algae, small fish, large fish, and bacteria. Which sequence correctly shows the flow of energy?

• Large fish → Small fish → Algae → Bacteria

• Algae → Small fish → Large fish → Bacteria

• Bacteria → Algae → Small fish → Large fish

• Small fish → Algae → Large fish → Bacteria

Tags

NGSS.MS-LS2-2

NGSS.MS-LS2-3

If the population of primary consumers increases significantly, what is the most likely effect on the producer population?

• Producer population will increase

• Producer population will decrease

• Producer population will remain unchanged

• Producer population will become decomposers

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-3

NGSS.MS-LS2-4

A food web shows that rabbits eat grass, foxes eat rabbits, and fungi decompose dead organisms. Which organism is a decomposer?

• Grass

• Rabbit

• Fox

• Fungi