Coral Reefs MCQ Quiz

What organisms build coral reefs?

• Seaweed

• Mollusks

• Coral polyps

• Starfish

Which of the following conditions is NOT ideal for coral reef formation?

• Clear water

• Warm temperatures

• Fast-moving currents

• Sunlight

What is the upper layer of a coral reef made of?

• Dead seaweed

• Shell fragments

• Living coral polyps

• Sand

Coral polyps protect themselves by creating:

• A shell of sand

• A bubble of mucus

• A limestone skeleton

• A layer of algae

Where are coral reefs most commonly found?

• Arctic oceans

• Deep sea trenches

• Tropical and subtropical shallow seas

• Freshwater lakes

Which reef is directly attached to the coastline?

• Barrier reef

• Coral atoll

• Fringing reef

• Outer reef

What separates a barrier reef from the shore?

• A volcano

• A lagoon

• An underwater mountain

• A trench

A coral atoll is formed when:

• A fringing reef merges with the land

• A volcanic island submerges over time

• A reef grows on the ocean floor

• Seaweed accumulates

Which part of the reef helps protect the inner reef from waves?

• Coral cays

• Lagoon

• Outer reef

• Fringing reef

Beyond which feature does coral growth stop due to depth and cold?

• Continental slope

• Coral cay

• Lagoon

• Atoll