Unusual Animal Migrations: Jellyfish Blooms

1. What ecological role do jellyfish blooms play?

A) They eliminate oxygen from water.
B) They filter pollutants from water.
C) They act as predators to most fish.
D) They can provide food for certain species.

2. Which factor can lead to increased jellyfish populations?

A) High pH levels
B) Eutrophication
C) Cold water currents
D) Reduced salinity

3. Where are jellyfish blooms most commonly observed?

A) Freshwater lakes
B) Coastal areas
C) High mountain streams
D) Open ocean

4. Why do jellyfish have a high reproductive potential?

A) They migrate during breeding season.
B) They can reproduce both sexually and asexually.
C) They require complex mating rituals.
D) They have a slow growth rate.

5. What does the term 'medusa' refer to?

A) The polyp stage of jellyfish.
B) The larvae stage of jellyfish.
C) The mature, free-swimming stage of jellyfish.
D) A type of jellyfish predator.

6. Which region has reported significant jellyfish blooms?

A) Lake Baikal
B) The Amazon River
C) The Arctic Ocean
D) The Black Sea

7. Which of the following is a method to study jellyfish migration?

A) Airborne surveys
B) Satellite tracking
C) Radioactive tagging
D) Underwater sound monitoring

8. What adaptation helps jellyfish in open waters?

A) Their strong propulsion ability
B) Their ability to swim against strong currents
C) Their thick gelatinous bodies
D) Their ability to drift with currents

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