Give three hypotheses for explaining why tropics show greatest levels of species richness.

Explain , giving three reasons, why tropics show greatest levels of species diversity.

Rivet popper hypothesis' to explain the role of species richness for ecosystem healthy was given by

Give the term for a series of trophic levels showing repeated eating.

Assertion : Biodiversity hotspots are the regions which possess high levels of species richness, high degree of endemism and no loss habitats. Reason : Total number of biodiversity hotspots in the world is 32 with two of these hotspots found in India.

Assertion. There are 34 biodiversity hot spots in the world Reason. High level of species richness is criterion for selection of a biodiversity hot spot

Assertion : The hotspots are the regions of accelerated habitat loss. Reason : Hotspots are the region of high levels of species richness.

Explain why mule is not considered as species ?

Give atleast two examples to explain how introduction of exotic species has advesely affected the native species.