Home
Class 12
BIOLOGY
Assertion: Louis pasteur showed that in ...

Assertion: Louis pasteur showed that in flask open to air, new living organisms appeared in the heat killed yeast culture.
Reason: Life arise from pre-existing life.

Text Solution

Verified by Experts

The correct Answer is:
B
Louis Pasteur, by careful expermentation, demostrated that life comes only from pre-existing life. He observed that in pre-sterlised closed flasks, life did not come from killed yeast while in anotehr falsk opento air, new iving organisms arose from kille dyeast. He showed that the source of the new apearing micro-organisms was the air and the organisms did not arise from the nuterient media.
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    NCERT FINGERTIPS ENGLISH|Exercise Environmental Issues|142 Videos

  • HUMAN HEALTH AND DISEASE

    NCERT FINGERTIPS ENGLISH|Exercise Human Health And Disease|177 Videos

Similar Questions

Explore conceptually related problems

Who said that "Life arises from pre-existing life"?

Assertion: Rotenone is a bioinsecticide. Reason: Rotenone is obtained from living organisms and is employed to kill bacteria.

Read the given statements and select the correct ones. (i) Swan-necked flask experiment was done by Louis Pasteur. (ii) The early belief of the spontaneous origin of life was disproved by Louis paseteur. (iii) Louis Pasteur is famour for germ theory of dieseases. (iv) The idea that life originates from pre-existing life is referred to as biogenesis theory. (v) Father Suarez was one of the greatest supporter of theory of special creation. (vi) Cosmozoic theory of the origin of life was proposed by Richter. (vii) The founder of 'theory of catastrophism' is Georges Cuvier.

Assertion : Rudolf Virchow modified the hypothesis of cell theory given by Schleiden and Schwann. Reason : Cell theory says that all cells arise from pre-existing cells.

Read the following statements carefully and select the correct ones. () Alfred wallace, a naturalist who worked in Malay Archipelago had also come to similar conclusions as Darwin around the same time. (ii) August Weismann by carefull experimentation demonstrated that life comes only from pre-existing life. (iii) The organs which have the same fundamental structure but are different in functions are called homologous organs. (iv) Rate of appearance of new form is inversely proportional to life spain of organism.

Louis Pasteur's experiments, if you recall, proved that life can arise from only pre-existing life. Can we correct this as life evolves from pre-esistent life or otherwise we will never answer the question as to how the first forms of life arose ? Comment.

Consider the following three statements and select the correct option stating which one is true (T) and which one is false (F). (i) Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing nonliving organic molecules (e.g, RNA, protein etc.) and that formation of life was preceded by chemical evolution. (ii) Based on observations made during a sea voyage around the world. Charles Darwin concluded that existing living forms share similarities to varying degrees only among themselves. (iii) Evolution by natural selection must have started when cellular forms of life with different metabolic capability originated on Earth.

Read the following statements and select the correct option w.r.t cell theory. (i) All living organisms are composed of cells and products of cells. (ii) Viruses are exception to cell theory because they are cellular particles. (iii) All cells arise from pre-existing cells. (iv) Activities of an organisms are the outcome of sum total of activities and interactions of its constituent cells. (v) Rudolf Virchow gave final shape to cell theory.

Who proposed that the first form of life could have come from pre-existing non-living organic molecules ?

Who propsed that the first form of life could have come from pre-existing non-living organic molecules?

NCERT FINGERTIPS ENGLISH-EVOLUTION-All Questions
  1. The most accepted line of descent in human evolution is

    Text Solution

    |

  2. Which of the following is an example for link species?

    Text Solution

    |

  3. Match the scientists listed under Column 'A' with ideas listed under c...

    Text Solution

    |

  4. In 1953 S.L. Miller created primitive earth conditions in the laborato...

    Text Solution

    |

  5. Variations during mutations of meiotic recombinations are

    Text Solution

    |

  6. Assertion: Louis pasteur showed that in flask open to air, new living ...

    Text Solution

    |

  7. Assertion: Primitive atmosphere was of reducing type. Reason: First ...

    Text Solution

    |

  8. Assertion: Thorns and tendrils of Bougainvillea and Cucurbita represen...

    Text Solution

    |

  9. Assertion: Moths living in the industrial areas became dark to match b...

    Text Solution

    |

  10. Assertion: Evolution is not a directed process in sense of determinism...

    Text Solution

    |

  11. Assertion: The embryos of fish, salamander, tortoise, chick and a man,...

    Text Solution

    |

  12. Assertion: Darwin's finches of Galapagos islands have different types ...

    Text Solution

    |

  13. Assertion: Adaptive ability is inherited. Reason: Fitness is the end...

    Text Solution

    |

  14. Assertion: Evolutionary trend is continous changes of character in a ...

    Text Solution

    |

  15. Assertion: Hardy-Weinberg principle explains the variations occurring ...

    Text Solution

    |

  16. Assertion: Founder effect may lead to formation of new species. Reas...

    Text Solution

    |

  17. Assertion: Genetic drift refers to changes in the allele frequency occ...

    Text Solution

    |

  18. Assertion: Disruptive selection changes the population towareds one pa...

    Text Solution

    |

  19. Assertion: Neanderthal man is the intermediate between Ramapithecus an...

    Text Solution

    |

  20. Assertion: The chimpanzee is the closest relative of the present day h...

    Text Solution

    |