Origin and Distribution

Hydrilla comes from Asia, Africa, and Australia.
  True
  False

Transportation

Hydrilla was introduced through ________?
  A. Use in aquariums.
  B. By accident on a giant glass ship that sailed from Asia to the United Stated in 1952.
  C. As a hitchhiker on garden plants.
  D. For sale as a natural foods herbal supplement.
  E. A and C.

Environmental Impact

Hydrilla is able to take over waterways and negatively impact native fish and plants because:
  A. It reproduces very rapidly by spreading plant fragments, seeds, tubers, and turions.
  B. Its seeds and turions stick to boats that move me from one area to another.
  C. Waterfowl eat the turions and then regurgitate them into new waterways.
  D. Its tubers can remain alive in the sediment for years until the conditions are right for them to sprout and create        a new stem.
  E. All of the above.

Economic Impact

Which of the following is NOT an economic impact of Hydrilla
  A. Boaters, people who fish, swimmers and water skiers get tangled in the dense mats of hydrilla.
  B. It costs millions of dollars each year to control hydrilla where it has established.
  C. Hydrilla mats raise the pH, provide poor habitat for fish or other wildlife, limit water movement, decrease        available oxygen, and shade out other aquatic plants.
  D. People have launched awareness campaigns to teach people about its impacts and prevent its spread.

Control

The best way to control hydrilla is to poison it with chemicals because it is 100% effective and has no impact on other organisms living in the water.
  True
  False