Question

extinction of tigers can destablise yhe entire forest ecosystemand result in a large scale of bio diversity

Answer 1

Extinction of any organism can destabilise the ecosystem as it disturbs the food chain or food Web of the forest
Tigers are top level carnivore so the organisms depending on Tiger for food will face threat of extinction due to absence of their food.
On the other hand, organisms on whom Tiger depends for food will increase in number due to absence of their predator.
Thus it disturbs the whole ecosystem