Question

What is common to Eichhornia, African catfish, and Lantana?
A. All mammals found in India
B. All are keystone species
C. All the endangered species of India
D. All the species are neither threatened nor indigenous species of India

Answer 1

Hint:
Eichhornia, African catfish, and Lantana are exotic species that are invasive and contain destabilizing effects, in turn leading to the extinction of indigenous species. Eichhornia species are hydrophytes with densely branched stems. The large African sharp-tooth catfish is an eel-like fish, generally of black or dark grey colouration on the back. Lantana genus includes both shrubs and herbaceous plants which produce flowers mix of orange, red, blue, or yellow and white florets.

Complete step by step answer:
Lantana camara comes from the American tropics and is an invasive plant species in India. Consequently, wild herbivores do not have enough forage plants to eat. Eichhornia crassipes is an invasive species of water hyacinth that invades and dominates entire water bodies and depletes local aquatic ecosystems of nutrients and resources. African catfish or Clarias gariepinus is an invasive species that depletes the nutrients and resources of local fish.
Keystone species are organisms that are so crucial to other organisms that their local environment would significantly change if they disappeared. The term endangered species refers to an organism that is in danger of extinction. None of the following species is either a keystone species or endangered species. There is no mammal among the species mentioned. Eichhornia crassipes and Lantana camara are vascular plants, whereas African catfish is a piece of the Chordata class.

Option ‘D’ is correct

Note:
The term indigenous species refers to organisms, plants, and animals living in a given area due to naturally occurring processes without human intervention. The term threatened species refers to any species that is at risk of being endangered soon.