Take the land area of the Earth as 149 million square kilometres…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Take the land area of the Earth as million square kilometres. NCERT says that the hotspots together cover less than per cent of it, and that strict protection of them could cut the ongoing mass extinctions by almost per cent.
- What is the greatest area that the hotspots can cover, in million square kilometres?
- A model says that the hotspots cover per cent of the land. What area is that, in million square kilometres to two decimals?
- A model region is expected to lose species. How many extinctions would strict protection avoid, if it cuts the loss by per cent?
Need a reminder? The key ideaShow
In situ conservation protects a species on site. A hotspot has a very high species richness and a high endemism. NCERT gives: hotspots cover less than 2 per cent of the land, and strict protection could cut the ongoing extinctions by almost 30 per cent. A biosphere reserve has a core, a buffer and a transition zone (the zones and their widths are standard knowledge, and the area arithmetic is not in the NEET syllabus).
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Land million . Hotspots: less than per cent. Cut in extinctions: per cent.
Step 1. (a) million , at most.
Step 2. (b) million .
Step 3. (c) species avoided. species are still lost.
Answer: million ; million ; species.
Check. A very small share of the land is linked to a large share of the loss that can be avoided.
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