Science and Technology II · Textbook solutions

Heredity and Evolution

Every solved example, exercise, and miscellaneous question — in the order the textbook teaches them. · 22 questions

Exercise

22 q
  1. Ex Q1
    Complete the following diagram. A central box labelled Evidences of Evolution has an arrow running from it to each of four boxes. Two of those boxes carry printed text and two are left blank:
    Position of boxPrinted inside the box
    Top leftMorphological
    Top right(blank)
    Bottom leftSimilarities in bones structure
    Bottom right(blank)
  2. Read the following statements and justify the same in your own words with the help of suitable examples.
    Ex Q2(a)
    Human evolution began approximately 7 crore years ago.
  3. Ex Q2(b)
    Geographical and reproductive isolation of organisms gradually leads to speciation.
  4. Ex Q2(c)
    Study of fossils is an important aspect of study of evolution.
  5. Ex Q2(d)
    There is evidence of fatal science among chordates.
  6. Complete the statements by choosing correct options from bracket. (Gene, Mutation, Translocation, Transcription, Gradual development, Appendix)
    Ex Q3(a)
    The causality behind the sudden changes was understood due to -- -- principle of Hugo de Vries.
  7. Ex Q3(b)
    The proof for the fact that protein synthesis occurs through -- --- was given by George Beadle and Edward Tatum.
  8. Ex Q3(c)
    Transfer of information from molecule of DNA to mRNA is called as -- -- -- process.
  9. Ex Q3(d)
    Evolution means -- -- -- --.
  10. Ex Q3(e)
    Vestigial organ -- -- -- present in human body is proof of evolution.
  11. Write short notes based upon the information known to you.
    Ex Q4(a)
    Lamarckism
  12. Ex Q4(b)
    Darwin's theory of natural selection.
  13. Ex Q4(c)
    Embryology.
  14. Ex Q4(d)
    Evolution.
  15. Ex Q4(e)
    Connecting link.
  16. Ex Q6
    Define vestigial organs. Write names of some vestigial organs in human body and write the names of those animals in whom same organs are functional.
  17. Answer the following questions.
    Ex Q7(a)
    How are the hereditary changes responsible for evolution?
  18. Ex Q7(b)
    Explain the process of formation of complex proteins.
  19. Ex Q7(c)
    Explain the theory of evolution and mention the proof supporting it.
  20. Ex Q7(d)
    Explain with suitable examples importance of anatomical evidences in evolution.
  21. Ex Q7(e)
    Define fossil. Explain importance of fossils as proof of evolution.
  22. Ex Q7(f)
    Write evolutionary history of modern man.