Understanding Eutrophication

What is the primary cause of eutrophication in lakes?

• Excess nutrients from fertilizers

• Overfishing

• Excessive rainfall

• Increased sunlight

How do algal blooms affect the underwater environment?

• They increase water temperature

• They block sunlight from reaching underwater plants

• They provide more food for fish

• They reduce water clarity

What happens to underwater plants when they cannot photosynthesize?

• They die due to lack of sunlight

• They become more colorful

• They produce more oxygen

• They grow faster

What is a by-product of photosynthesis that is crucial for aquatic life?

• Carbon dioxide

• Nitrogen

• Oxygen

• Hydrogen

What role do decomposers play in the process of eutrophication?

• They help fish to survive

• They prevent algal blooms

• They decay dead plant material, using up oxygen

• They increase oxygen levels

What is the ultimate effect of eutrophication on fish in the lake?

• Fish population increases

• Fish become more active

• Fish die due to low oxygen levels

• Fish migrate to other lakes

What happens to the oxygen concentration in the water as a result of eutrophication?

• It fluctuates

• It decreases

• It remains the same

• It increases

Which organisms increase in number due to the presence of dead plant material?

• Decomposers

• Underwater plants

• Fish

• Algae

What is the main consequence of an algal bloom on the lake's ecosystem?

• Improved water quality

• Oxygen depletion

• Increased fish population

• Enhanced plant growth

What is the process called when there is an excess of nutrients in the water leading to algal growth?

• Photosynthesis

• Eutrophication

• Decomposition

• Respiration