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Biology · Textbook solutions

Origin and Evolution of Life

Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 34 questions

Exercise

34 q

Q1. Multiple choice questions

Practice · 10
  1. Multiple choice questions.
    Ex Q1(1)
    Who proposed that the first form of life could have come from pre- existing non-living organic molecules?

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  2. Ex Q1(2)
    The sequence of origin of life may be-

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  3. Ex Q1(3)
    In Hardy - Weinberg equation , the frequency of homozygous recessive individual is represented by :-

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  4. Ex Q1(4)
    Select the analogous organs-

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  5. Ex Q1(5)
    Archaeopteryx is known as missing link because it is a fossil and share characters of both-

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  6. Ex Q1(6)
    Identify the wrong statement regarding evolution.

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  7. Ex Q1(7)
    Gene frequency in a population remain constant due to –

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  8. Ex Q1(8)
    Which of the following characteristic is not shown by the ape?

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  9. Ex Q1(9)
    ................. can be considered as conncting link between between ape and man.

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  10. Ex Q1(10)
    The cranial capacity of Neanderthal man was

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Q2. Very short answer question

Practice · 10
  1. Very short answer question.
    Ex Q2(1)
    Define the following terms- a. Gene pool b. gene frequency c. Organic evolution d. Population e. Speciation
  2. Ex Q2(2)
    What is adaptive radiation?
  3. Ex Q2(3)
    If the variation occur in population by chance alone and not through natural selection and it brings change in frequencies of an allele. What is it called?
  4. Ex Q2(4)
    State the Hardy – Weinberg eqnilibrium.
  5. Ex Q2(5)
    What are homologous organs?
  6. Ex Q2(6)
    What is vestigeal organ?
  7. Ex Q2(7)
    What is the scientific name of modern man?
  8. Ex Q2(8)
    What is coacervate?
  9. Ex Q2(9)
    Which period is known as “age of Reptilia”?
  10. Ex Q2(10)
    Name the ancestor of human which is described as man with ape brain.

Q3. Short answer question

Practice · 6
  1. Short answer question.
    Ex Q3(1)
    Write a note on Genetic drift.
  2. Ex Q3(2)
    Enlist the different factors that are responsible for changing gene frequency.
  3. Ex Q3(3)
    Draw a graph to show that natural selection leads to disruptive change.
  4. Ex Q3(4)
    Give the significance of fossils.
  5. Ex Q3(5)
    Write the objections to Mutation theory of Hugo de vries.
  6. Ex Q3(6)
    What is disrruptive selection? Give example.

Q4. Match the following

Practice · 1
  1. Ex Q4
    Match the following.
    Columu- IColumn – II
    1. August Weismanna. Mutation theory
    2. Hugo de Vriesb. Germplasm theory
    3. Charles Darwinc. Theory of inheritance of acquired characters
    4. Lamarckd. Theory of natural selection

Q5. Long answer questions

Practice · 6
  1. Long answer questions.
    Ex Q5(1)
    Would you consider wings of butterfly and bat as homologous or analogous and why?
  2. Ex Q5(2)
    What is adaptive radiation? Explain with suitable example.
  3. Ex Q5(3)
    By taking industrial melanism as one example, explain the concept of natural selection.
  4. Ex Q5(4)
    Describe the Urey and Miller’s experiment.
  5. Ex Q5(5)
    What is Isolation? Describe the different types of reproductive Isolatons.
  6. Ex Q5(6)
    What are Genetic variations? Explain the different factors responsible for genetic variations.

Q6. Complete the chart

Practice · 1
  1. Ex Q6
    Complete the chart.
    EraDominating group of animal
    1. Cenozoic.................................
    2. ....................Reptiles
    3. Palaeozoic.................................
    4. ....................Invertebrates