Jellyfish Life Cycle and Behavior

The video explores jellyfish, found in all oceans, as part of the cnidarian group. It covers their physical traits, such as being invertebrates with no bones, eyes, or brains, and their unique movement through jet propulsion. Jellyfish are largely transparent, aiding in predator evasion, and some are bioluminescent. They are carnivorous, using stinging cells to capture prey. The life cycle includes stages from eggs to medusa. Despite their beauty, some jellyfish can be dangerous to humans.

Which group of animals do jellyfish belong to?

• Arthropods

• Echinoderms

• Cnidarians

• Mollusks

What is the largest size a lion's mane jellyfish can reach?

• 9 feet

• 7 feet

• 5 feet

• 3 feet

How do jellyfish move through the water?

• By crawling

• By jet propulsion

• By using fins

• By floating

What percentage of a jellyfish's body is made up of water?

• 95%

• 50%

• 85%

• 70%

What is the purpose of the light sensors in some jellyfish?

• To detect food

• To sense sunlight

• To communicate

• To navigate currents

Why are jellyfish difficult to spot in the water?

• They are very small

• They are transparent

• They hide in coral reefs

• They swim very fast

How do jellyfish capture their prey?

• By chasing them

• By luring them with light

• By using nets

• By waiting for them to get caught in their tentacles

What is the first stage in the jellyfish life cycle?

• Egg

• Medusa

• Ephyra

• Polyp

What does a polyp resemble in the jellyfish life cycle?

• A rock

• A seaweed

• An underwater flower

• A small fish

What is the typical lifespan of a mature jellyfish?

• A few months

• Several years

• About a year

• A few weeks