Coastal Ecosystems and Marine Life

The video explores marine ecosystems, focusing on coastal wetlands, coral reefs, and ocean life zones. It highlights the importance of phytoplankton in oxygen production and carbon dioxide absorption. Coastal wetlands, including estuaries, salt marshes, and mangrove swamps, provide vital ecological functions. Coral reefs, diverse yet fragile, face threats from pollution and tourism. The ocean is divided into life zones, each with unique characteristics, and faces challenges from pollution and overfishing.

What is the primary role of phytoplankton in marine ecosystems?

• They produce a significant portion of Earth's oxygen.

• They create coral reefs.

• They are a major source of food for humans.

• They provide habitat for fish.

Which of the following is NOT a function of coastal wetlands?

• Producing limestone coral fragments

• Filtering pollutants and sediments

• Absorbing excess rain to prevent flooding

• Providing habitat and nesting areas

What is an estuary?

• A deep ocean trench

• A freshwater lake

• An area where freshwater mixes with saltwater

• A type of coral reef

Which type of coastal wetland is characterized by grasses?

• Estuaries

• Salt marshes

• Mangrove swamps

• Coral reefs

What makes coral reefs particularly vulnerable to environmental changes?

• Their ability to withstand pollution

• Their location in deep ocean waters

• Their reliance on freshwater

• Their fragility and diversity

Which of the following is a major threat to coral reefs?

• Excessive nutrients

• Lack of sunlight

• Overfishing and tourism

• Increased salinity

Which ocean life zone is known for having the highest concentration of marine species?

• Coastal zone

• Abyssal zone

• Bathyal zone

• Euphotic zone

What characterizes the abyssal zone of the ocean?

• Dark, cold, and low in dissolved oxygen

• High in sunlight and phytoplankton

• Shallow and clear

• Warm and nutrient-rich

What is a significant source of ocean pollution?

• Natural erosion

• Fertilizers from agricultural runoff

• Volcanic activity

• Wind erosion

How does overfishing impact ocean ecosystems?

• It increases biodiversity.

• It stabilizes fish populations.

• It reduces specific fish populations and overall biodiversity.

• It has no significant impact.