Assertion: Water hyacinth spread all over the water body in a short period of time and it is very difficult to get rid of them.
Reason: Water hyacinth propagate vegetatively at a phenomenal rate.

Answer

A

Explanation

You must have heard about the scourage of the water bodies or about the 'Terror of Bengal' . This is nothing but the aquatic plant ' water hyacinth' .
It in one of most invasive weeds found growing wherever there is stnding water. It does drains oxygen from the water, which leads to death of fishes.
It is interesting to know that this plant was introduced in India because of its beautiful flowers and shape of leaves. since. it can propagate vegetatively at a phenomenal rate and spread all over the water body in a short period of time, it is very difficult to get rid of them.