unit 5 review

The higher the temperature, the more dissolved oxygen in water.

• True

• False

Which of these can do photosynthesis?

• Algae

• Seaweed

• Trees

• All of the above

All of the following add Dissolved Oxygen to the water except....

• From Photosynthesis by underwater plants

• Movement of the water

• Air in the atmosphere

• Underground Oxygen deposits

Colder water.....

• hold MORE dissolved oxygen

• holds LESS dissolved oxygen

How do bacteria affect Dissolved Oxygen (DO) in water bodies?

• increase DO through decomposition

• decrease DO through decomposition

• DO stays the same

• bacteria multiply DO by 8

Why does the amount of dissolved oxygen increase during the day?

• The sunlight allows photosynthesis to occur

• The warmer temperatures allow the water to hold more oxygen

• The fish are more active so they are respiring more

What can REMOVE dissolved oxygen from the water?

• cellular respiration

• decomposition

• warming waters

• All of the above

How does low Dissolved Oxygen levels affect organisms?

• Organisms may die or have to leave if levels get too low

• Organisms go through more cellular respiration

• Organisms eat more

Algae blooms will ____________ the amount of dissolved oxygen in an aquatic system.

• Decrease

• Increase

Why do algae blooms happen?

• there are too many nutrients in the water

• there are too many fish in the water

• there is not enough turbidity in the water

• all of these options