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CSS :: Organic Evolution Theories


11.  Which of the following theories of evolution can best explain the vestigial organs:
A. Darwinism B. Lamarckism
C. Natural selection D. Special creation

12.  Lamarck's theory of organic evolution cannot give best explanation for one of the following:
A. Rudimentary eyes in deep-sea fishes B. Strong canines and claws of carnivores
C. Fast running adaptations in deers D. Only those which are fittest can survive and are selected by the nature

13.  Which of the following facts is not correct about Lamarckism in the light of current scientific knowledge:
A. All the characters acquired by the individuals during life time and inherited B. Organs used more by the organism grow more in size
C. Both (a) & (b) D. None of these

14.  Which of the following statements will be wrong in contest of modern concept of evolution:
A. Isolation prevents interbreeding between members of same species B. Appreciably small "Gene Pool" will lead to significant variations
C. Variations in the organisms are caused by sexual reproduction D. None of these

15.  "Neolamarckism" states that:
A. There is enormous fertility in organisms but their number always remains constant B. "Like begets Like"
C. All the beritable characters are carried by 'genes' which become incorporated in the genotype and are heritable D. The life cycle of an individual repeats the characters which were present in its ancestors

16.  Greatest blow to Lararckism came from the work of:
A. Charles Darwin B. August Weismann
C. Hugo De 'Vries D. Alfred Russell Wallace

17.  From the experiments upon mice by cutting the tails of new-born mice for more than twenty generations and yet no hereditary effect, Weismann could conclude:
A. "Theory of survival of fittest" B. "Theory of continuity of germplasm"
C. "Inheritance of acquired characters" D. "Isolation plays significant role in evolution"

18.  Weismann stated that a multicellular body is divisible into somaplasm and germplasm which separate at early embryonic life. Therefore only link between these will be:
A. Environment B. Gametes
C. Both (a) & (b) D. None of these

19.  According to Weismann theory which of the following facts will be correct:
A. Changes occurring in somaplasm during life time are inherited B. Germplasm continues generation after generation as impartial matter whereas somaplasm only functions to house the germplasm
C. In the struggle for existence due to over production, environmental effects the individuals which are best suitable to get maximum chances for mating D. None of these

20.  By illustrating the examples of African giraffe and snakes Lamarck emphasized mainly that:
A. Nature selects the forms which are fittest in the struggle for existence B. Development and efficiency of body organs are an proportion to their use and disuse
C. Variations (environmental or mutations) are respobsible for process of organic evolution D. The organisms have enormous fertility leading to over production but their number is always kept constant by the nature




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