World’s most problematic aquatic weed is: a. Azolla b. Wolffia c. Eichhornia d. Parthenium
Option C. Eichhornia crassipes (water hyacinth) is the world's most problematic aquatic weed, also called "Terror of Bengal". Because of its very high rate of growth, it can cover the surface of whole water bodies, choke them and cause a threat to other aquatic life forms.
