4. Marine Ecology

Food Webs — Quiz

Test your understanding of food webs with 5 practice questions.

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Practice Questions

Question 1

Which of the following organisms typically occupies the highest trophic level in a simple marine food chain?

Question 2

What is the primary reason for the decrease in available energy at successive trophic levels in a marine food web?

Question 3

In a marine food web, what is the term for organisms that consume primary consumers?

Question 4

If a marine food web consists of phytoplankton, zooplankton, small fish, and seals, which organism would be considered a tertiary consumer?

Question 5

Consider a marine food chain: Microalgae $\rightarrow$ Krill $\rightarrow$ Penguin. If the microalgae initially contain $100,000 \text{ units}$ of energy, how much energy would typically be available to the penguin, assuming a $10\%$ energy transfer efficiency at each step?