Loss of Biodiversity
ICSE · Class 11 · Geography
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What is biodiversity loss?
Answer
Biodiversity loss is the decline in the variety of living organisms because species become threatened, endangered, or extinct, and their habitats are damaged or destroyed. It happens when the natural …
Why is biodiversity loss considered a major environmental problem in tropical regions?
Answer
Tropical zone areas cover only 1/4th of the globe but house about 3/4th of the world's population. This creates heavy pressure on land, forests, and wildlife. As a result, tropical regions face major …
Why are the Zaire basin and Amazon basin important in the study of biodiversity?
Answer
The maximum damage in tropical rain forests has been done to the Zaire basin in Africa and the Amazon basin in South America. About half of the world's species are found in these forests, so their des…
What are threatened species?
Answer
Threatened species are species whose lives are at risk and who always run the danger of losing their lives. WCMC's Red Data Books mention 66,000 plant species and 2,000 animal species as threatened wo…
What are endangered species?
Answer
Endangered species are species that face a high risk of extinction in the near future. Mace and Lande (1991) defined endangered species as species with a 20% probability of extinction within 20 years …
What are extinct species?
Answer
Extinct species are species for which no member remains alive anywhere in the world. Once a species becomes extinct, it cannot recover because its living population no longer exists.
Differentiate between threatened, endangered, and extinct species.
Answer
Threatened species are at risk of loss. Endangered species are in a more serious condition and may become extinct soon if harmful factors continue. Extinct species have no living member left anywhere …
How does UNEP show that population density affects threatened species?
Answer
UNEP assessed 102 countries and found that densely populated countries had higher proportions of threatened species than thinly populated countries. In 51 densely populated countries, about 5.1% of bi…
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