Understanding Eutrophication

The video explains eutrophication, a process where water bodies become enriched with nutrients, leading to excessive growth of algae. This is often caused by runoff from fertilizers and organic waste. The algae form a layer on the water surface, blocking oxygen entry, which results in the death of aquatic organisms. Decomposers consume the dead matter, releasing more nutrients and perpetuating the cycle.

What is the primary source of nutrients that lead to eutrophication in water bodies?

• Industrial waste

• Ocean currents

• Forest runoff

• Household and agricultural waste

How do decomposers contribute to the process of eutrophication?

• By increasing water temperature

• By consuming oxygen and releasing nutrients

• By blocking sunlight

• By producing harmful chemicals

What effect does the algae layer have on the water surface?

• It reduces water temperature

• It blocks the entry of oxygen

• It enhances oxygen levels

• It increases water clarity

What is a direct consequence of oxygen depletion in water bodies?

• Enhanced plant growth

• Improved water quality

• Increased fish population

• Death of aquatic organisms

How does the cycle of eutrophication continue after the death of organisms?

• The dead organisms are removed by humans

• The dead organisms decompose, releasing more nutrients

• The dead organisms are consumed by larger predators

• The dead organisms sink to the bottom and remain unchanged