Long Answer Type(a) Name the primates that lived about 15 million years ago. List their characteristic features.
(b) (i) Where was the first man-like animal found?
(ii) Write the order in which Neanderthals, Homo habilis and Homo erectusappeared on earth.
State the brain capacity of each one of them.
(iii) When did modern Homo sapiens appear on this planet?
Short Answer Type(a) Select the homologous structures from the combinations given below :
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
Since the origin of life on the 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.
(i)The Sixth Extinction is different from the previous episodes of mass extinction in the following ways
a. The rates of extinction is faster and is estimated to be 100-1000 times faster than in the previous ones.
b.. It is due to the activities of human and not because of any natural calamity as compared to the previous episodes.
(ii).Human activities are mainly responsible for the Sixth extinction.
(iii) The points that can help to overcome this disaster are:
a Avoiding over exploitation of the ecosystem.How do homologous organs represent divergent evolution ? Explain with the help of a suitable example.
Switch
