Origin and Distribution

What river basin is the water hyacinth native to?
  A. Nile River basin.
  B. Amazon River basin.
  C. Mississippi River basin.
  D. Rio Grande River basin.
  E. Danube River basin.

Transportation

Water hyacinth was introduced to the United States at the 1884 Cotton Exposition in California.
  True
  False

Environmental Impact

Water hyacinth decreases plant and animal diversity by:
  A. Roots putting out nutrients.
  B. More light for photosynthesis allowed into water.
  C. Oxygen depletion.
  D. None of the above.
  E. All of the above.

Economic Impact

The dense mats formed by water hyacinth pose a problem for boaters and fishermen.
  True
  False

Control

The most effective ways to control water hyacinth are by harvesting, biological control and herbicides.
  True
  False