Question

American water plant that has become troublesome waterweed in India is
A. Cyperus rotundus
B. Eichhornia crassipes
C. Typha latifolia
D. Trapa bisipinosa

Answer 1

Hint: It is a free-floating aquatic macrophyte that forms dense, flowing mats is a foreign invader that has become waterweed in India. It is hard to eradicate them from the water bodies. Its growth leads to a reduction in the percentage of dissolved oxygen in the water bodies.

Complete step by step answer: Eichhornia crassipes is commonly known as water-hyacinths or terror of Bengal. It is an aquatic plant that is native to the Amazon basin. It is known for its highly problematic invasion of its native range. It consumes water nutrients and grows in thick layers over the water. It was introduced to India by the British by the late eighteen century. Due to a lack of natural consumers, they grow prolifically and occupy an abundance of space. They increase heavy metal pollution in the water bodies. They reproduce by vegetative reproduction through short runner stems known as stolons. These stolons radiate from the base of the plants to form the daughter plants. It also reproduces by seeds. Therefore, this plant has become troublesome waterweed in India.
Hence, the correct answer is option is B.

Note: Water hyacinth is a free-floating hydrophyte which is native to the tropical and subtropical South America. It is characterized by conspicuously attractive flowers that are lavender to pink in colour. It is also known as an invasive water weed because of its ability to clone itself and form large patches of plants that are genetically the same.