Even though India is one of the 17 identified megadiverse countries of the world, it faces lots of threats to its biodiversity.
(i) Apart from natural causes, human activities, both directly and indirectly are today's main reason for habitat loss and biodiversity loss.
(ii) Fragmentation and degradation due to agricultural practices, extraction (mining, fishing, logging, harvesting) and development (settlements, industrial and associated infrastructures) lead to habitat loss and fragmentation leads to the formation of isolated, small and scattered populations and as endangered species.

(i) The introduction of the Nile Perch into Lake Victoria led to the extinction of more than 200 species of cichlid fish in that lake.
(ii) Introduction of African catfish Clarias gariepinus for aquaculture poses a threat to the indigenous catfishes in indian rivers.

(i) Development of human society is inevitable. Natural habitats are destroyed for the purpose of settlement, agriculture, mining, Industries and construction of highways
(ii) As a result species are forced to adapt to the changes in the environment or move to other places. If not, they become victim to predation, starvation, disease and eventually die or results in human animal conflict.
(iii) Over population, urbanization, Industrialization and agricultural advancements require additional land, water and raw materials every year.
(iv) This is made possible only through fragmentation or destruction of natural habitats by filling wetlands, ploughing grasslands, cutting down trees, forest, desilting rivers, constructing transport ways, caving mountains, extracting, ores, changing the course of rivers and filling of seashore.

The term biodiversity was introduced by Walter Rosen (1986). Biodiversity is the assemblage of different life forms. Each species is adapted to live in its specific environments.
The changes in climatic conditions are reflected in the distribution and pattern of biodiversity on our planet. The number of species per unit area declines as we move from tropics towards the poles. The Tundra and Taiga of northern Canada, Alaska, northern Europe and Russia possess less than 12 species of trees. The temperate forests of the United states have 20-35 species of trees, while the tropical forests of Panama have over 110 species of trees in a relatively small area.

(i) A species that has been categorized as very likely to become extinct is an endangered species. Endangered (EN), as categorized by the International Union for Conservation of Nature (IUCN)
(ii) Red List, is the second most severe conservation status for wild populations in the IUCN's scheme after Critically Endangered (CR).
(iii) Example: In 1998 there were 1102 animal and 1197 plant species in the IUCN Red List
(iv) In 2012, the list features 3079 animal and 2655 plant species as endangered (EN) worldwide. 

Insitu and Exsitu are two types of biodiversity conservation strategies.