$A$ weed belonging to the family $Asteraceae$ which has spread in all parts of India is

Poaching of tiger is a burning issue in today's world. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part?

Assertion: Tropical rain forests are disappearing fast from developing countries such as India.
Reason: No value is attached to these forests because these are poor in biodiversity.

Which of the following communities is more vulnerable to invasion by outside animals and plants?

The primary cause of biodiversity loss is .....

When a species becomes extinct,the plant and animal species associated with it in an obligatory way also become extinct. This phenomenon is known as: