Question

Water hyacinth is related to
A. Eichhornia
B. Pistia
C. Lemna
D. None of these

Answer 1

Hint: Water hyacinth is an invasive weed that reproduces very quickly and is the most invasive type of weed found among the aquatic plants. It spreads over the whole water body very quickly and is considered the most invasive weed.

Complete Answer:
Water hyacinth is an aquatic plant that is native to Amazon basin and is also found quite commonly in India. It is a free floating perennial aquatic plant which is a weed and spreads across the whole water body at an enormous rate by its vegetative propagation. In vegetative reproduction it reproduces by offsets that run horizontally. These weeds can grow an average of 2 to 5 metres a day and they produce thousands of seeds in a year which remain viable for nearly 25 years.

Let us analyze the options to find out the correct option of how they are related to.
Option A: Eichhornia crassipes is also called as water hyacinth and they reproduce very fast. They spread all over the water body and do not let other plants and fishes absorb oxygen. This leads to their death. Therefore, this is the correct option.

Option B: Pistia is a genus or aquatic plant and belongs to the family of Araceae. It is also called water cabbage and water lettuce. They are not called water hyacinth. Therefore, this is the incorrect option.

Option C: Lemna belongs to the genus of free-floating aquatic plant. It is from the family of Araceae. It is commonly known as duckweeds not water hyacinth. Therefore, this is the incorrect option.

Option D: Since one of the above mentioned options is correct, this is the incorrect option.

Thus, the correct option is A) Eichhornia.

Note: - The invasiveness of water hyacinth is due to its ability to clone itself through vegetative mode.
- They are also called terror of Bengal because the scarcity of fish not only causes lack of food to people in Bengal but also causes financial disturbances to the people as a lot of vendors depend on selling fish to earn their livelihood.