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December 25, 2017

Lesson-2
Environment

Concept of Ecosystem upsc, Abiotic and Biotic factors, Crash Course ecology

  Concept of an Ecosystem: Living organisms cannot live isolated from their non-living environment be­cause the latter provides materials and energy for the survival of the former i.e. there is interaction between a biotic community and its environment to produce a stable system; a natural self-sufficient unit which is known as an ecosystem. An ecosystem

Lesson-3
International Organisation

United Nations Organization UPSC l United Nations Brief Overlook

  In addition to the six ‘principal organs’ outlined in the previous session, the UN system includes a number of other committees, funds, programmes and agencies. The work of some of these bodies is often featured in the news – the World Health Organization, UN Refugee Agency and World Food Programme, for example. Others are

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