Freshwater Ecosystems quiz
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What fish spits water to knock insects off leaves?
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More questions about Freshwater Ecosystems
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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How do salmon find the stream where they hatched?
Answer: By smell
Why: Young salmon memorize their home stream's odor just before heading to sea, then follow it back as adults.
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How long was the beaver dam found from space in Canada in 2007?
Answer: About 850 m
Why: Most beaver dams in Canada are just 10 to 100 m long and only rarely reach 500 m.
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Which group of fish does the electric eel belong to?
Answer: Knifefish
Why: Electric eels are closer relatives of catfish and carp than of true eels such as the moray.
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What is the fan of land at a river's mouth called?
Answer: Delta
Why: It is named after the triangular Greek letter Δ, which the Nile's wedge of land at the sea resembles.
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How many of the world's fish species live in fresh water?
Answer: About 1 in 2
Why: They share freshwater lakes and rivers that hold less than 0.01% of all the water on Earth.
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Which nutrient turned one half of a split Canadian lake green?
Answer: Phosphorus
Why: The other half got similar nitrogen and carbon but no phosphorus, and its algae did not increase.
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