How do the attacks of foreign Species affect the biodiversity?

● Willing or the unwilling arrival of a foreign species threatens the existence of local species and creates an imbalance in the ecosystem

● An example of the willing arrival of foreign species is lengthened.

-It was brought by the British and was planted in the Kolkata botanical garden.

-Today, this plant is a danger for local biodiversity as it does not allow the nearby plant to grow and is not eaten by the plants.

● Another example of willing arrival is hyacinth.

-It is also called the water lily was brought to India from Brazil for its purplish flowers. The uncontrolled spreading of water hyacinth covers the water surface and restricts the sunlight from entering into the water.

-This results in the plants inside the water bodies to get destroyed, and the organisms can die to lack of oxygen.

● Example of unwilling arrival is Parthenium.

-Parthenium came in with imported wheat from America.

-Parthenium grass seed is one of the most dangerous plant weed, which is not eaten by animals. This plant contains chemicals, which cause allergy.