Jellyfish quiz

More questions about Jellyfish

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Which animals use spiny throat linings to swallow jellyfish?

   Answer: Sea turtles

   Why: Leatherback turtles live almost entirely on jellyfish, and backward-pointing spines in their throat stop prey from escaping once caught.

2. 2 Medium

   How many hearts are found inside the body of a jellyfish?

   Answer: Zero

   Why: No heart, no blood, no brain; oxygen simply diffuses through the two thin tissue layers, and only about 5 percent of a jellyfish is solid matter.

3. 3 Hard

   Which juvenile stage is released when a jellyfish polyp strobilates?

   Answer: Ephyra

   Why: The eight-lobed ephyra pulses through the water column until marginal tissue growth fills in the gaps.

4. 4 Easy

   In which natural environments do almost all jellyfish species live?

   Answer: Oceans

   Why: True jellyfish are all marine; the best-known freshwater species is a coin-sized hydrozoan now found on every continent but Antarctica.

5. 5 Medium

   Why do many jellyfish species have four-leaf clover shapes inside?

   Answer: Reproductive organs

   Why: The four-leaf clover is a set of gonads, and their tetramerous arrangement is the giveaway that the whole animal is built in fours.

6. 6 Hard

   What process splits a jellyfish polyp into a stack of discs?

   Answer: Strobilation

   Why: Each saucer-like segment produced during strobilation detaches individually to mature into an independent jellyfish.