CBSE  /  Class 10  /  Science  /  Heredity and Evolution

  • 1. 
    New species may be formed if

  • (i) and (ii)
  • (i) and (iii)
  • (ii), (iii) and (iv)
  • (i), (ii) and (iii)

  • 2. 
    Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F

  • (i) and (ii)
  • (i) and (iv)
  • (ii) and (iii)
  • (i) and (iii)

  • 3. 
    A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

  • Carrot and potato
  • Carrot and tomato
  • Radish and carrot
  • Radish and potato

  • 4. 
    If the fossil of an organism is found in the deeper layers of Earth, then we can predict that

  • the extinction of organism has occurred recently
  • the extinction of organism has occurred thousands of years ago
  • the fossil position in the layers of Earth is not related to its time of extinction
  • time of extinction cannot be determined

  • 5. 
    A trait in an organism is influenced by

  • paternal DNA only
  • maternal DNA only
  • both maternal and paternal DNA
  • neither by paternal nor by maternal DNA

  • 6. 
    Select the group which shares maximum number of common characters.

  • two individuals of a species
  • two species of a genus
  • two genera of a family
  • two genera of two families

  • 7. 
    According to the evolutionary theory, formation of a new species is generally due to

  • sudden creation by nature
  • accumulation of variations over several generations
  • clones formed during asexual reproduction
  • movement of individuals from one habitat to another

  • 8. 
    In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F

  • 1 : 3
  • 3 : 1
  • 1 : 1
  • 2 : 1

  • 9. 
    Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

  • reptiles have evolved from birds
  • there is no evolutionary connection between reptiles and birds
  • feathers are homologous structures in both the organisms
  • birds have evolved from reptiles
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