Eutrophication - AP Environmental Science
- Which aquatic organisms are most directly impacted by hypoxia?
- Fish and invertebrates. Require dissolved oxygen for cellular respiration and are first to die.
- Name a consequence of hypoxia in aquatic environments.
- Fish kills. Low oxygen levels suffocate fish and other aerobic aquatic organisms.
- What is the relationship between eutrophication and dead zones?
- Eutrophication creates dead zones. Oxygen depletion creates areas where most marine life cannot survive.
- How does eutrophication affect aquatic food webs?
- Disrupts trophic levels. Changes primary producers and eliminates species dependent on clear water.
- Identify a chemical method to control eutrophication.
- Alum treatment. Chemical that binds phosphorus, making it unavailable to algae.
- What is a visible sign of algal blooms?
- Green surface scum. Dense algae mats float on surface creating characteristic green appearance.
- What role do wetlands play in controlling eutrophication?
- Nutrient filtration. Plants absorb excess nutrients and slow water flow to trap sediments.
- What is a negative effect on humans from eutrophication?
- Contaminated drinking water. Toxic algae and poor water quality make water unsafe for consumption.
- Identify a societal impact of eutrophication.
- Economic loss in fisheries. Reduced fish populations and water quality affect commercial fishing industry.
- Identify a primary nutrient causing eutrophication.
- Phosphorus. Key limiting nutrient that triggers rapid algae growth when abundant.
- Identify a legislative measure to combat eutrophication.
- Clean Water Act. Federal law regulating water pollution and nutrient discharge limits.
- What is the impact of eutrophication on biodiversity?
- Biodiversity loss. Altered habitat conditions eliminate sensitive species and favor few tolerant ones.
- Which factor exacerbates the effects of eutrophication?
- Rising temperatures. Heat accelerates metabolic processes and algae growth rates.
- What is a common source of phosphorus in water bodies?
- Fertilizers. Contain high concentrations of phosphorus that wash into water bodies.
- How does urban runoff contribute to eutrophication?
- Carries nutrients into waterways. Stormwater picks up fertilizers, pet waste, and other nutrient sources.
- What is the role of riparian buffers in eutrophication control?
- They reduce nutrient flow. Vegetation along waterways absorbs nutrients and prevents erosion.
- Which gas is depleted during eutrophication, harming aquatic life?
- Oxygen. Consumed by decomposing bacteria breaking down dead organic matter.
- What is the role of algae in the eutrophication process?
- Algae bloom and block sunlight. Dense growth shades underwater plants, preventing photosynthesis.
- Which organism benefits temporarily from eutrophication?
- Phytoplankton. Microscopic algae that rapidly multiply when nutrients are abundant.
- Name a biological control method for eutrophication.
- Introducing filter feeders. Organisms like mussels consume algae and filter water naturally.
- Identify a practice to minimize nutrient runoff.
- Crop rotation. Alternating crops reduces continuous nutrient depletion and runoff.
- Which factor can naturally limit eutrophication?
- Nutrient uptake by plants. Healthy vegetation absorbs nutrients before they reach water bodies.
- Identify a common indicator of eutrophication in water.
- Increased turbidity. Algae growth makes water cloudy and reduces light penetration.
- Which human activity contributes to eutrophication?
- Agricultural runoff. Fertilizers and animal waste add excess nitrogen and phosphorus to waterways.
- Which type of pollution is linked to eutrophication?
- Non-point source pollution. Diffuse pollution from many sources like farms and urban areas.
- Which process results from algae blooms in eutrophication?
- Hypoxia or oxygen depletion. Dead algae decomposition consumes dissolved oxygen, creating oxygen-poor conditions.
- Which process in the nitrogen cycle can exacerbate eutrophication?
- Nitrification. Converts ammonia to nitrates, adding bioavailable nitrogen to water.
- Name a method to reduce eutrophication.
- Buffer strips. Vegetation strips filter nutrients from runoff before reaching waterways.
- What is a consequence of eutrophication on water quality?
- Decreased water clarity. Algae clouds water and reduces visibility and light penetration.
- What type of water body is most affected by eutrophication?
- Lakes and ponds. Slow water movement allows nutrients to accumulate and algae to persist.
- Name an ecological effect of eutrophication.
- Loss of fish habitat. Oxygen depletion eliminates suitable living conditions for many fish species.
- What is the role of cyanobacteria in eutrophication?
- They form harmful blooms. Blue-green algae produce toxins and dominate in nutrient-rich conditions.
- Identify a governmental strategy for reducing eutrophication.
- Nutrient management plans. Policies limiting fertilizer use and requiring nutrient reduction strategies.
- What is eutrophication?
- Excessive nutrient enrichment in water bodies leading to algae blooms. Occurs when too many nutrients cause rapid plant growth and ecosystem imbalance.
- What is the role of decomposers in eutrophication?
- They consume oxygen while breaking down algae. Bacterial decomposition of dead algae uses up dissolved oxygen.
- Which season is eutrophication most pronounced?
- Summer. Warm temperatures accelerate algae growth and decomposition rates.
- What is the effect of eutrophication on recreational activities?
- Reduced recreational appeal. Algae blooms and foul odors deter swimming, boating, and fishing.