Question

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

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Louis Pasteur, by careful experimentation, demonstrated that life comes only from pre-existing life. He observed that in pre-sterilised closed flasks, life did not come from killed yeast while in another flask open to air, new living organisms arose from 'killed yeast'. He showed that the source of the new appearing micro-organisms was the air and the organisms did not arise from the nutrient media