Biological Oxygen Demand

In the northeastern United States, lakes located near agricultural fields likely experience high biological oxygen demand. What is the most likely cause?

• runoff

• bioaccumulation of pesticides

• irrigation of crops using ground water

• waste from livestock disposed in lakes

• ?

Tags

NGSS.MS-LS2-4

NGSS.MS-LS2-5

What does Biological Oxygen Demand (BOD) measure in a water body?

• The amount of oxygen consumed by microorganisms

• The amount of oxygen produced by aquatic plants

• The total oxygen content in the water

• The oxygen required for fish respiration

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following factors can increase the Biological Oxygen Demand in a river?

• Increased sunlight

• Increased levels of organic waste

• Decreased water temperature

• Decreased levels of carbon dioxide

How is Biological Oxygen Demand (BOD) typically measured?

• By measuring the oxygen levels before and after incubation

• By measuring the pH levels of the water

• By measuring the carbon dioxide levels in the water

• By measuring the nitrogen content in the water

Why is a high Biological Oxygen Demand (BOD) considered harmful to aquatic life?

• It indicates low levels of dissolved oxygen

• It indicates high levels of dissolved oxygen

• It indicates high levels of nutrients

• It indicates low levels of carbon dioxide

What is the typical incubation period for measuring Biological Oxygen Demand (BOD)?

• 5 days

• 1 day

• 10 days

• 30 days

Which of the following is a common source of organic waste that increases BOD in water bodies?

• Industrial discharge

• Agricultural runoff

• Urban runoff

• All of the above

What is the relationship between Biological Oxygen Demand (BOD) and water pollution?

• Higher BOD indicates higher pollution

• Higher BOD indicates lower pollution

• BOD is not related to pollution

• BOD only measures chemical pollution

In an experiment, a water sample shows a BOD of 8 mg/L. What does this indicate about the water quality?

• The water is highly polluted

• The water is moderately polluted

• The water is clean

• The water is extremely clean

Which of the following processes can help reduce Biological Oxygen Demand in wastewater?

• Aeration

• Sedimentation

• Chlorination

• Filtration