Ocean Ecosystems Quiz

What percentage of the Earth's surface is covered by oceans?

• 50%

• 60%

• 70%

• 80%

Which of the following is a biotic factor in the ocean?

• Rocks

• Sand

• Saltwater

• Fish

What is the primary function of gills in fish?

• To protect them from predators

• To extract oxygen from water

• To help them see underwater

• To help them swim faster

Which plant is known for producing a significant portion of the Earth's oxygen?

• Mangroves

• Phytoplankton

• Kelp

• Seagrass

What is the main abiotic factor that characterizes the ocean?

• Freshwater

• Saltwater

• High altitude

• Low pressure

Which ocean habitat is often referred to as the 'rainforest of the sea'?

• Mangrove forests

• Kelp forests

• Coral reefs

• Open ocean

What unique feature do mangrove trees have?

• Roots above the sand

• Leaves that change color

• Flowers that bloom underwater

• Branches that grow in spirals

Which animal helps control the sea urchin population in kelp forests?

• Dolphins

• Sea turtles

• Sharks

• Sea otters

What is the term for the phenomenon where sea turtles return to their birthplace to lay eggs?

• Spawning

• Breeding

• Migration

• Natal homing

Why is it important to protect one part of the ocean?

• It has no effect on other parts

• It can impact the entire ocean

• It only affects local wildlife

• It is not important