Aquatic Biomes: Exploring Freshwater and Marine Ecosystems

The video explores aquatic biomes, which are the largest part of the biosphere. It distinguishes between freshwater and marine biomes based on physical and chemical differences. Freshwater biomes include lakes, rivers, and wetlands, and are vulnerable to pollution. Marine biomes, covering most of Earth's surface, include oceans, coral reefs, and estuaries, and are crucial for oxygen production. The video also discusses the stratification of aquatic environments, the ecological roles of different biomes, and the impact of human activities on these ecosystems.

What percentage of the Earth's surface is covered by the ocean, a major aquatic biome?

• 75%

• 50%

• 60%

• 85%

Which of the following is a characteristic of freshwater biomes?

• Covers most of the Earth's surface

• Linked with surrounding soils and plant life

• Provides most of the world's oxygen supply

• High salt concentration

What is a major ecological role of wetlands?

• Providing rainwater for the land

• Being a popular feeding place for humans

• Improving water quality by filtering pollution

• Supporting large schools of fish

What is a defining feature of estuaries?

• They are standing bodies of water

• They are where fresh and salt water mix

• They are completely saturated with water

• They are the largest of all biomes

Which organisms are commonly found in estuaries due to their ability to tolerate varying salinities?

• Dolphins

• Sea turtles

• Mangrove trees and blue crabs

• Sea anemones

Which of the following is a threat to both wetlands and estuaries?

• Overfishing

• Urban development

• Decreased nutrient levels

• Increased salinity

What environmental condition is characteristic of intertidal zones?

• High nutrient levels

• Cyclic exposure to air and water

• Low productivity

• Constant exposure to sunlight

Which organisms are primary producers in intertidal zones?

• Plankton

• Algae and seagrass

• Coral reefs

• Mangrove trees

What is a significant impact of human activity on the open ocean biome?

• Increased oxygen levels

• Reduction in plankton populations

• Depletion of fish stocks

• Expansion of coral reefs

What role do plankton play in the open ocean biome?

• They are the main source of salt

• They complete close to half of global photosynthesis

• They provide shelter for fish

• They are the primary cause of eutrophication