Eutrophication and Aquatic Ecosystems

The video discusses eutrophication, a process where excess nutrients lead to oxygen depletion in water bodies. It explains natural eutrophication, which occurs over thousands of years, and cultural eutrophication, accelerated by human activities like waste discharge. This process causes rapid growth of aquatic plants and phytoplanktons, leading to increased carbon dioxide and decreased oxygen levels, suffocating aquatic life. The video also links eutrophication to ocean acidification and highlights it as a significant environmental concern, especially in India.

What is the primary cause of the green color observed in some water bodies?

• High oxygen levels

• Excessive nutrients

• Presence of minerals

• Low carbon dioxide levels

How long does natural eutrophication typically take to occur?

• A few months

• Several years

• Thousands of years

• A few days

Which human activities contribute to cultural eutrophication?

• Overfishing

• Urban development

• Deforestation

• Industrial waste discharge

What role do sulfates and phosphates play in water bodies?

• They decrease carbon dioxide levels

• They serve as fertilizers

• They act as pollutants

• They increase oxygen levels

What happens to aquatic plants and phytoplanktons during cultural eutrophication?

• They become dormant

• They decrease in number

• They grow excessively

• They migrate to other areas

What is a direct consequence of the decomposition of dead aquatic plants?

• Release of carbon dioxide

• Decrease in carbon dioxide

• Stabilization of water pH

• Increase in oxygen levels

What is the effect of decreased oxygen levels in water bodies?

• Improved plant health

• Enhanced fish growth

• Suffocation of aquatic animals

• Increased water clarity

What is ocean acidification primarily caused by?

• Increased oxygen levels

• Decreased nutrient levels

• Cultural eutrophication

• Natural eutrophication

How does ocean acidification affect carbon dioxide levels in water?

• It decreases them

• It has no effect

• It stabilizes them

• It increases them

Why is eutrophication a significant environmental concern in India?

• It reduces air quality

• It affects aquatic ecosystems

• It causes soil erosion

• It leads to water scarcity