Environmental Chemistry ELO 2

Dissolved oxygen levels must always be ____ to inicate good water quality

• 5ppm

• above 5ppm

• below 5ppm

• above 10ppm

presents of pollution intolerant indicator species will

• clean up the water

• pollute the water

• Let us know the quality is good

• let us know the quality is bad

The majority of aquatic creatures prefer a pH range of 6.5-9.0. If it is too low or high they will die

• True

• False

This is essential for the survival of fish and other aquatic organisms

• Dissolved oxygen

• Dissolved nitrogen

• Suspended algae

• Nitrates

Which is a true statement of the diagram above?

• As temperature increases dissolved oxygen increases

• As temperature decreases dissolved oxygen decreases

• As temperature increases dissolved oxygen decreases

• Noe of the above

Which of the following is not one of the categories for water quality?

• Irrigation water
• Recreational water
• Protection of aquatic life
• Acidic water

The organism that indicates the water quality is a

• Water tester
• Biological indicator
• Water indicator
• Biological tester

Biological indicators are harmful to the environment.

• True
• False

What is an example of an aquatic invertebrate?

• Bacteria
• Caddisfly Larva
• Plankton
• Non of the above

Organisms are affected by which of these causes?
A: Heavy metals
B: Phosphorus and Nitrogen
C: Biological indicators

• A and B
• A and C
• B and C
• A, B, and C