Measuring Water Quality

What is a physical parameter for measuring water quality?

• BOD5

• Methane

• Temperature

• Nutrients

How does oxygen dissolve in bodies of water?

• By capturing atmospheric oxygen

• By the production of oxygen from aquatic plants

• By anaerobic decomposition

• By the production of carbon dioxide

What is BOD5?

• The amount of dissolved oxygen in the water

• The amount of nutrients in the water

• The amount of methane in the water

• The amount of organic matter in the water

How is BOD5 measured in a water sample?

• The temperature of the water is measured

• The level of dissolved oxygen is measured

• The sample is placed in a dark place at 20 °C in a sealed container for 5 days

• The conductivity of the water is measured

Why are physical and chemical indicators sometimes not sufficient to evaluate water quality?

• Because they are not available

• Because they depend on other factors such as temperature and turbidity

• Because they are not relevant

• Because they are not precise

What species can function as bioindicators of water quality?

• Macroinvertebrates

• All of the above

• Microorganisms

• Fish, amphibians, and mammals

What type of species are difficult to catch and count as bioindicators?

• Macroinvertebrates

• Mammals

• Microorganisms

• Vertebrates

What type of species have high mobility and are difficult to count as bioindicators?

• Mammals

• Aquatic macroinvertebrates

• Microorganisms

• Vertebrates

What type of species are tolerant to organic pollution and low levels of oxygen?

• Macroinvertebrates

• Microorganisms

• Vertebrates

• Mammals

What type of species cannot tolerate low levels of oxygen and move away or die if organic pollution enters the river where they live?

• Vertebrates

• Microorganisms

• Macroinvertebrates

• Mammals