At high altitudes,birds become rare or extinct. The plants which may disappear along with them are:

Identify the incorrect match with respect to recently extinct animals and their place of extinction according to the $IUCN$ Red List.

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

Which of the following pairs of organisms represents alien species in India?

Which of the following statements is correct regarding Parthenium (Carrot grass)?
$(a)$ It was introduced into India as a contaminant with imported wheat.
$(b)$ It causes allergies.
$(c)$ Asexual reproduction occurs in its flower.

Clarias gariepinus is harmful to which organism?