Since the origin of life on Earth, there were five episodes of mass extinction of species .
(i) How is the 'Sixth Extinction', presently in progress, different from the previous episodes ?
(ii) Who is mainly responsible for the 'Sixth Extinction' ?
(iii) List any four points that can help to overcome this disaster.

Which among the following statement/s is/are INCORRECT? I. Since the origin and form diversification of earth there were four episodes of extinction. II. The current rate of extinction is 100 to 1000 times faster than in the pre-human times. III. Ecologists warn that if the present trend continues, nearly one-fourth of all the species on earth might be wiped out within the next 100 years.

(i) The term lungs of the planet is used for (ii) What is the main reason of deforestation of Amazon rain forest. (iii) How can high degree of endemisms is responsible for extinction of species.

Indicate whether the following statements are true or false. Correct each faqlse statement to make it true. (i) Mass extinction is the extermination of a large number of species due to catastrophers. (ii) IUCN Red list (2004) documents the extinction of 359 animal species. (iii) Quagga from Africa and Stellers sea cow from America have been extinct in last few years. (iv) Anthropogenic extinction is 10-100 times more faster than the rate of natural extinctions.