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[A]: Isolation is a mechanism which prev...

[A]: Isolation is a mechanism which prevents interbreeding among other wise potential mates.
[R]: It is the key factor without which all other factors of evolution will merge into jumble of no significance

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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TRUEMAN BIOLOGY-Genetics-ASSERTION AND REASON
  1. [A]: Cycads were prevalent during Jurassic period. [R]: Jurassic pe...

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  2. [A]: Evolution is descent with modification. [R]: Evolution is der...

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  3. [A]: Isolation is a mechanism which prevents interbreeding among other...

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  4. [A]: Mesozoic era is known as the 'Age of Reptiles'. [R]: It was ...

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  5. [A]: Radioactive carbon ^(14)C method is quite accurate for relativel...

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  6. [A]: According to Hardy-Weinburg law both gene frequencies and genotyp...

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  7. [A]: 'Ontogeny recapitulates phylogeny' was the concept put forward by...

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  8. [A]: Vestigeal organs are those parts of the body which are greatly re...

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  9. [A]: Homology is the similarity between or- gans of same animal based ...

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  10. [A]: Ear muscles of external ear in man are well developed. [R]:...

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  11. [A]: Convergent evolution leads to production of analogous similaritie...

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  12. [A]: Heritable changes are also called mutations. [R]: Mutations ...

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  13. [A]: Homologous organs have similar structure but different functions....

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  14. [A]: In large groups of animals and plants, there are identical enzyme...

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  15. [A]: During evolution of Primates, various groups diverged in a partic...

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  16. [A]: Macro evolution produces groups of parallel special adaptations a...

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  17. [A] : Organisms that bear large number of common amino acid sequence m...

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  18. [A]: Homologous organs have similar structure but different functions....

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  19. Assertion:Analogous organs serve the same function and look alike, but...

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  20. Assertion:Frog's tadpole has fish-like form, tail and gills Reason: ...

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