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Biodiversity refers to the combined diversity at all levels of biological organisation. It includes genetic diversity, species diversity and ecological diversity. Importance of biodiversity:
(i) A wide range of materials such as fibres, dyes, resins are obtained from plants.
(ii) A variety of plants and animals are utilised as sources of food.
(iii) Medicinal plants act as sources of drugs.
(iv) Plants and animals also have a cultural and aesthetic value.