BIODIVERSITY
NCERT….
Revision point
🐟🐟 There are about 20,000 species of ants, 3,00,000 species of beetles, 28,000 species of fishes & 20,000 species of orchids
🐛🐛 Term biodiversity was popularised by Edward wilson
🐝🐝 India has 50,000 genetically different strains of rice and 1000 varieties of mango
🐞🐞 Acc to IUCN (2004), No.of species discovered and described range about 1.5 million
🐲🐲 Robert may estimate – total no.of species is around 7 million
🐉🐉 More than 70% of species discovered are animals
🐜🐜 More than 70% of animals are insects
🐌🐌 Plants constitute not more than 22% of total species
🐬🐬 Total no.of species of fungi is more than combined total of fishes, amphibians, reptiles and mammals
🐥🐥 India occupy 2.4% of total land surface but they contribute 8.1% of total biodiversity
🐦🐦 There are about 45,000 species of plants and twice as many animals are discovered in india
🐢🐢 Acc to robert estimate…only 22% of total no.of species have been discovered
🐏🐏 There are 1,00,000 plant species and more than 3,00,000 animals species are yet to be discovered in india
🐀🐀 Columbia has 1400 species of birds…newyork – 105 species of birds, Greenland – 56 species
🐦🐦 India has 1200 species of birds Amazonian rain forest in south
🌲🌲america has 1300 species of birds, 40000 species of plants, 427 amphibians, 427 mammals, 378 reptiles, more thab 1,25,000 invertebrates
🌱🌱 The colonisation of tropical pacific island by humans has led to the extinction of 2000 species of native birds
🌴🌴 Over 784 species have extincted in past 500 years ( 359 invertebrates, 338 vertebrates & 87 plants )
🌵🌵 In last 20 years, 27 species disappeared
🌴🌴 Around 15,500 species are facing threat of extinction
🌾🌾 32% amphibians, 31% gymnosperms, 23% mammals, & 12% birds are facing threat of extinction 🙏🙏
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