Which one of the following statements is incorrect?

The correct answer is Option (4) → Lantana is commonly known as carrot grass.

All four statements are about the loss of biodiversity. The African catfish, Parthenium and Lantana are alien species that turned invasive in India, and Steller’s sea cow is a recent extinction. The incorrect statement mixes up the common names of two invasive weeds.

Option (1) African catfish poses a threat to indigenous catfishes. — A correct statement. The African catfish Clarias gariepinus was illegally introduced for aquaculture, and it now threatens the indigenous catfishes in our rivers.

Option (2) Steller’s sea cow is an extinct animal. — A correct statement. Steller’s sea cow of Russia is among the recent extinctions; it was lost because of overexploitation by humans.

Option (3) Parthenium is an invasive species in our country. — A correct statement. Parthenium is an invasive weed that damages the environment and threatens our native species.

Option (4) Lantana is commonly known as carrot grass. — An incorrect statement. Carrot grass is the common name of Parthenium, not of Lantana. Lantana is a separate invasive weed.

NCERT Extract:
Loss of Biodiversity – “… 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.”
Loss of Biodiversity – “… Some examples of recent extinctions include the dodo (Mauritius), quagga (Africa), thylacine (Australia), Steller’s Sea Cow (Russia) and three subspecies (Bali, Javan, Caspian) of tiger.”