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Mention the evolutionary significance of...

Mention the evolutionary significance of the following organisms :
(i)Shrews (ii)Lobefins (iii)Homo habilis (iv)Homo erectus

Text Solution

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a) Shrews : The first mammals were like shrews. Their fossils are small sized.
b) Lobefins: In 1938, a fish caught in South Africa happened to be coelacanth which was thougth to be extinct. These animals called lobefins evolved into the first amphibians that lived on both hand and water. There are no speciments of these left with us.
c) Homo habilis: Two mya, Australopithecines probably lived in East African grasslands. Evidence shows, they haunted like being hominid and was called homo habilis.
d) Homo erectus: They had larged brain around 900 cubic centimeters. They probably ate meat. They used to hides to protect their body and buried their dead.
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Knowledge Check

  • Which of the following are compounds ? (i) Co (ii) NO(iii) NO(iv)CO

    A
    (i) and (ii)
    B
    (ii) and (iii)
    C
    (iv) and (iii)
    D
    (ii) and (iv)

  • Which of the following is incorrect about the Homo habilis ?

    A
    It is considered to be evolved after Australopithecus.
    B
    It was the fist hominid
    C
    Cranial capacity was around 650-800 cc.
    D
    It was absolutely carnivorous.

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