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

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

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

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

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

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

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

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

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

A graph shows the amount of energy (in kilocalories) at each trophic level in an ecosystem: Producers (10,000 kcal), Primary Consumers (1,000 kcal), Secondary Consumers (100 kcal), Tertiary Consumers (10 kcal). What percentage of energy is transferred from producers to primary consumers?

Examine a graph that shows the biomass at each trophic level in a forest ecosystem. If the producer level has 5000 kg of biomass and the primary consumer level has 500 kg, what does this suggest about the efficiency of energy transfer between these levels?

A scientist observes that when the population of hawks decreases, the population of snakes increases. Using your knowledge of food webs, what is the most likely explanation for this observation?

Given a food web with the following relationships: Plants → Insects → Frogs → Snakes → Hawks, predict what would happen to the frog population if the insect population were drastically reduced. Explain your reasoning.

A graph shows the number of organisms at each trophic level in a pond ecosystem: Producers (200), Primary Consumers (50), Secondary Consumers (10), Tertiary Consumers (2). If a pollutant kills half of the primary consumers, what is the most likely effect on the secondary consumers? Justify your answer.