Nutrient Dynamics and Algal Blooms in Aquatic Ecosystems

The video explains the essential needs of plants, including water, sunlight, and nutrients like nitrogen and phosphorus. It discusses how fertilizers are used to supplement poor soil but can lead to nutrient runoff into water bodies, causing algal blooms. These blooms block sunlight, disrupt aquatic ecosystems, and lead to oxygen depletion, harming aquatic life. The video highlights the long-term effects of eutrophication, such as reduced biodiversity and ecosystem damage, and encourages viewers to consider the environmental impact of fertilizers and deforestation.

What are the primary nutrients that fertilizers add to the soil to aid plant growth?

• Calcium and Magnesium

• Nitrogen and Phosphorus

• Iron and Zinc

• Potassium and Sulfur

Why do farmers often apply more fertilizer than necessary?

• To enhance the soil's color

• To prevent soil erosion

• To increase the soil's water retention

• To ensure all plants receive enough nutrients

What is the term used to describe the rapid increase in algae due to excess nutrients?

• Decomposition

• Algal Bloom

• Eutrophication

• Photosynthesis

What happens to underwater plants when an algal bloom occurs?

• They are unable to photosynthesize

• They receive more sunlight

• They grow faster

• They produce more oxygen

What process consumes oxygen during the decomposition of dead algae?

• Fermentation

• Respiration

• Photosynthesis

• Decay

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

• Enhanced plant growth

• Increased fish population

• Improved water clarity

• Fish suffocation

How does eutrophication affect biodiversity in aquatic ecosystems?

• It stabilizes biodiversity

• It decreases biodiversity

• It has no effect on biodiversity

• It increases biodiversity

What can cause nutrient-rich runoff besides fertilizers?

• Urban development

• Clear-cutting and animal farms

• Wind erosion

• Natural rainfall

What is a possible effect of eutrophication on coral reefs?

• Coral color change

• Increased coral diversity

• Coral bleaching

• Coral growth enhancement

What is the term for the process where excess nutrients lead to decreased oxygen levels in water?

• Eutrophication

• Photosynthesis

• Respiration

• Sedimentation