Ocean Ecosystems and Productivity Concepts

The video explores Earth's biomes, highlighting the ocean's vastness yet low productivity compared to its size. It explains the role of primary producers, like phytoplankton, and the factors affecting ocean productivity, such as nutrient availability and thermoclines. Coastal areas and certain anomalies show higher productivity due to nutrient upwelling and river discharges. The video emphasizes the importance of protecting productive ecosystems like coral reefs and rainforests.

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

• 50%

• 65%

• 71%

• 85%

Which terrestrial ecosystem is most similar in productivity to the open ocean?

• Regular desert

• Tropical rainforest

• Grassland

• Tundra

Which ecosystem is more productive than the open ocean?

• Tundra

• Extreme desert

• Semidesert

• Coral reefs

What is the significance of algal beds and coral reefs in marine ecosystems?

• They cover most of the ocean floor

• They are the least productive ecosystems

• They support a large number of marine species

• They are found only in polar regions

What is the primary role of phytoplankton in the ocean?

• Filtering pollutants

• Producing oxygen

• Providing shelter for fish

• Acting as primary producers

What is the main reason for low productivity in the open ocean?

• High salinity

• Lack of nutrients

• Lack of sunlight

• Strong currents

What is a thermocline?

• A type of marine plant

• A nutrient-rich zone

• A layer of water with different temperatures

• A type of ocean current

How does the Coriolis effect influence ocean productivity?

• By causing nutrient upwelling

• By reducing salinity

• By increasing sunlight

• By warming the water

Which factor is NOT a reason for higher productivity in coastal waters?

• Proximity to land

• High salinity

• Nutrient upwelling

• River discharge

Why is it important to protect the ocean despite its low productivity?

• It is home to all marine life

• It covers a small area of Earth

• It provides essential services to the planet

• It is the only source of fresh water