Crustaceans quiz
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Which 'crab' is closer kin to spiders than to lobsters?
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More questions about Crustaceans
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What crustacean shape has evolved at least five times?
Answer: Crab
Why: Even king crabs did it on their own, evolving their crab shape from hermit crab ancestors.
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What do people with a shrimp allergy react to?
Answer: Proteins
Why: ASCIA, the Australasian allergy body, notes that these seafood proteins are usually heat stable, so cooking does not easily destroy them.
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How big can an adult Antarctic krill grow?
Answer: About 6 cm
Why: Eggs of Antarctic krill sink to about 3,000 metres before hatching, and the young then swim all the way back up.
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Which metal turns lobster blood blue?
Answer: Copper
Why: Lobster blood carries oxygen on hemocyanin, a copper protein that is colorless until oxygen binds to it and turns it blue.
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Where do lobsters release urine when signaling rivals?
Answer: Near their antennae
Why: Chemical signals ride in the urine, and a lobster that loses a fight later recognizes the winner by its smell.
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What army used dried sea fireflies as map lights in World War II?
Answer: Japanese army
Why: Southern Japan's coastal waters are home to this sea firefly.
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