Question

An aquatic fern ‘Salvinia’ is also known as …………...

Answer 1

Hint: The fern belongs to a neotropical genus which is closely related. It's an underwater weed here. Their common name is water moss.

Complete answer:
The Salvinia an aquatic fern that is commonly grown in water is a plant that is known as Kashmir's sorrow or 'Sorrow of Kashmir'. Salvinia contains both annual and perennial species. The plant comprises a floating stem with the upper surface having two rows of large green leaves and the lower surface having branched leaf roots.
As a plant with a high growth rate, it occupies the entire surface of the aquatic body. There's uncontrollable development in it.
This results in matting on the surface of the water body, leading to oxygen cutting and sunlight supply-cutting under the aquatic surface.
This leads to the marine animals being 'suffocated'. In Kashmir, this growth is predominant. So, it is called Kashmir's Sorrow.

So, the answer to this question is, ‘Sorrow of Kashmir’.

Note:
In tropical and warm temperate areas, water ferns are widespread around the world, and some are cultivated as aquarium plants. While water ferns often root in mud, they float more frequently on the surface of shallow water in ditches, lakes, and stagnant backwaters in riverine habitats.
A genus in the Salviniaceae family is Salvinia which is a floating fern. It is named in honor of Anton Maria Salvini, a 17th-century Italian scientist. Salvinia is a common name. Salvinia is associated with other water ferns, including the Azolla mosquito fern. Recent sources include Salviniaceae in both Azolla and Salvinia , although each genus was previously given its own family.