Ocean Ecosystems Quiz

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

• 50%

• 60%

• 80%

• 70%

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

• Saltwater

• Sand

• Rocks

• Fish

What is the primary role of phytoplankton in the ocean ecosystem?

• Storing carbon

• Filtering water

• Producing oxygen

• Providing shelter

Which abiotic factor is most responsible for the diversity of life in different parts of the ocean?

• Salt concentration

• Sunlight availability

• Temperature variations

• Water depth

What is a unique feature of mangrove forests compared to coral reefs?

• They are home to sea otters

• They are made of coral

• They provide protection above and below water

• They are found in cold waters

Why are coral reefs often referred to as the 'rainforests of the sea'?

• They have a high diversity of life

• They are dense with trees

• They are located in tropical areas

• They are made of wood

Which animal is known for controlling the sea urchin population in kelp forests?

• Sea turtles

• Dolphins

• Sea otters

• Sharks

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

• Hatchling homing

• Natal homing

• Migration

• Breeding return

What is the main challenge for organisms living in the open ocean?

• Cold temperatures

• Lack of sunlight

• High salinity

• Limited protection

Which of the following is NOT a habitat discussed in the video?

• Coral reefs

• Kelp forests

• Mangrove forests

• Desert dunes