Aquatic Pest Management Aquatic Science Practice Exam Complete

AQUATIC PEST

MANAGEMENT AQUATIC

SCIENCE PRACTICE EXAM

COMPLETE

Question 1: Which measurement most directly indicates the amount of oxygen

available to �sh in the water column?

Choices:

1) Turbidity 2) Dissolved oxygen 3) Alkalinity 4) Conductivity

Correct Answer: Dissolved oxygen

Explanation: Dissolved oxygen is the concentration of oxygen gas available in water for respiration by �sh and other aerobic organisms.Page 1

Question 2: A pond has a dense algal bloom followed by several cloudy days. What is the greatest immediate water-quality concern?

Choices:

1) A sudden increase in alkalinity 2) A decline in dissolved oxygen 3) A permanent decrease in hardness 4) An increase in salinity

Correct Answer: A decline in dissolved oxygen

Explanation: Cloudy weather reduces photosynthesis while algae and microbes continue respiring, which can lower dissolved oxygen and stress or kill �sh.

Question 3: What does turbidity primarily describe?

Choices:

1) The acid-neutralizing capacity of water 2) The amount of suspended material that reduces water clarity 3) The concentration of dissolved oxygen 4) The total phosphorus stored in bottom sediments

Correct Answer: The amount of suspended material that reduces water clarity

Explanation: Turbidity is the cloudiness of water caused by suspended particles and other materials that scatter or absorb light.Page 2

Question 4: Which nutrient most often limits freshwater algal growth in lakes and ponds?

Choices:

1) Phosphorus 2) Sodium 3) Chloride 4) Silica only

Correct Answer: Phosphorus

Explanation: Phosphorus is commonly the limiting nutrient in freshwater systems, so excess phosphorus frequently stimulates nuisance algal growth.

Question 5: What is eutrophication?

Choices:

1) The gradual enrichment of water with nutrients that increases biological productivity 2) The removal of all aquatic vegetation from a lake 3) The conversion of freshwater to saltwater 4) The rapid cooling of surface water during winter Correct Answer: The gradual enrichment of water with nutrients that increases biological productivity Explanation: Eutrophication is nutrient enrichment, often involving nitrogen and phosphorus, that increases plant and algal productivity and can contribute to low oxygen conditions.Page 3