Illustrate with the help of an example how introduction of an alien speices turns invasive and causes decline of an indigenous species.

Introduction of alien species into new area poses a threat to extinction of indigenous species due to

With the help of an example, explain how variation leads to evolution.

Mark true or false in the following statements. (i) Habitat loss and fragmentation is the most important cause driving animals and plants to extinction. (ii) Steller's sea cow has been extinct due to habitat loss. (iii) When alien species are introduced deliberated or unintentionally for whatever purpose, some of them turn invasive and cause extinction of indigenous species. (iv) When a host fish species becomes extinct its unique assemblage of parasites also meets the same fate.

With the help of a suitable example illustrate palindrome.

With the help of any one example explain Alien species invasion as one of the causes of Biodiversity losses.

With the help of suitable example, explain how science is applied.

Elaborate how invasion by an alien species reduces the species diversity of an area.