AP Environmental Science : Ecological Impacts

Study concepts, example questions & explanations for AP Environmental Science

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Example Questions

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Example Question #411 : Ap Environmental Sciences

What is a potential result of fertilizer runoff into streams and rivers?

Possible Answers:

Making trees downstream grow larger

Free fertilizer for downstream farmers

Poisoning of water invertebrates by pesticides

Eutrophication and increased algal bloom

Increased lake and river fertility

Correct answer:

Eutrophication and increased algal bloom

Explanation:

Fertilizer runoff can cause eutrophication, where nutrient-enriched freshwater mixes with saltwater and causes huge algal bloom, such as red tide. These can be toxic to both ocean organisms and to humans. 

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