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IB Marine Science Standard Level (SL) Practice Exam

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Which common zooplankton crustacean is widely found in marine ecosystems and important in food webs?
Correct Answer:
Copepod
Explanation:
Copepods are tiny crustacean zooplankton that are found throughout the marine environment. They are one of the most abundant groups of zooplankton and play a crucial role in food webs: they graze on phytoplankton and then become prey for many larger animals, from small fish to seabirds and whales. This makes them a major conduit for transferring energy from primary producers to higher trophic levels. The other options aren’t crustaceans—they’re a flowering plant (angiosperm), a photosynthetic bacterium (cyanobacterium), and a single-celled protist with a calcium carbonate shell (foraminifera). That combination of being a crustacean and a key prey-predator link in oceans is why copepods are the best answer.

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