Question 2
Water hyacinth (Eichhornia cracipes) is a noxious weed that clogs sewage system, blocks navigation and interferes with the activities of people living near the river. Knowing the life cycle of the weed which multiplies by both asexual and sexual means, which of the following CANNOT be an effective way of controlling infestation of this weed?
A. by shading the plant
B. by cutting the rhizome
C. by herbicide application
D. by collection of its flower
A. by shading the plant
B. by cutting the rhizome
C. by herbicide application
D. by collection of its flower