Q1 of 62 Page 110

How is the presently occurring species extinction different from the earlier mass extinctions?

Past five episodes of mass extinction of species occurred due to natural causes like volcanic eruptions, flood etc.

But the ongoing sixth episode of mass extinction is 100-1000 times faster than the previous five episodes and it is due to the interference of the humans.


All other episodes were pre-human period but the sixth one is anthropogenic.


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15

What is common to the species shown in figures A and B?


 16

What is common to the species shown in figures A and B?



 2

Of the four major causes for the loss of biodiversity (Alien species invasion, habitat loss and fragmentation, over-exploitation and co-extinctions which according to you is the major cause for the loss of biodiversity? Give reasons in support.

 3

Discuss one example, based on your day-to-day observations, showing how loss of one species may lead to the extinction of another.