Question

“Water hyacinth” or Eichhornia is one of the important problematic weeds of static water in India. Which of the following statement is incorrect about it?

• A.
  It is also known as “Terror of Bengal”
• B.
  It is a native plant of India
• C.
  It increases biological oxygen demand of water body
• D.
  It spread rapidly through vegetative propagation

Answer 1

The correct option is B

It is a native plant of India
Water hyacinth or "Terror of Bengal" is an aquatic plant which is one of the most invading weeds found growing in the standing water.
It is also called as "blue devil" as it takes oxygen from the water which causes death of fishes.
This plant was introduced in India for its beautiful flowers and shape of leaves. It can propagate vegetatively at a fast rate and spread all over the water body in a short time.
It is very difficult to remove it from the water body. Water hyacinth is a free-floating perennial aquatic plant (or hydrophyte) native to tropical and sub-tropical South America.

So, the incorrect statement is 'It is a native plant of India'.