$Parthenium$ (carrot grass) that came into India has become ubiquitous in occurrence and causes pollen allergy.

What is the cause of genetic erosion?

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

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.

Which of the following is an endemic fish species of Lake Victoria?

Why do alien species often become invasive when introduced into a new habitat?