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

   In which natural environments do almost all jellyfish species live?

   Answer: Oceans

   Why: True jellyfish are all marine. The freshwater jellyfish found in lakes are coin sized hydrozoans, harmless to swimmers.

2. 2 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.

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

   What do most jellyfish mainly eat?

   Answer: Plankton

   Why: Moon jellies do not chase prey: plankton sticks to mucus on the bell and tiny cilia sweep it to the oral arms and mouth.

5. 5 Medium

   What method do jellyfish use to propel themselves through the ocean water?

   Answer: Jet propulsion

   Why: The bell's elastic rebound refills it for free, so a moon jelly's cost of transport is under a third of a salmon's.

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.