Identify the species which is not invasive:

The correct answer is Option (4) → Vallisneria

Invasive alien species are brought in from outside and spread fast, harming native species.

Option (1) Parthenium — An invasive species. Carrot grass.

Option (2) Lantana — An invasive species.

Option (3) Eicchornia — An invasive species. Water hyacinth.

Option (4) Vallisneria — Not an invasive species. It is a native submerged water plant, known for pollination by water.

NCERT Extract:
Loss of Biodiversity – “… (iii) Alien species invasions: When alien species are introduced unintentionally or deliberately for whatever purpose, some of them turn invasive, and cause decline or extinction of indigenous species. The Nile perch introduced into Lake Victoria in east Africa led eventually to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake. You must be familiar with the environmental damage caused and threat posed to our native species by invasive weed species like carrot grass (Parthenium), Lantana and water hyacinth (Eicchornia). The recent illegal introduction of the African catfish Clarias gariepinus for aquaculture purposes is posing a threat to the indigenous catfishes in our rivers.”