1
Question
Observe the experiment. This experiment was famous as
Observe the experiment. This experiment was famous as
Open in App
Solution
The correct option is C Swan necked
Louis Pasteur designed an experiment to test whether sterile nutrient broth could spontaneously generate microbial life. To do this, he set up two experiments. In both, Pasteur added nutrient broth to flasks, bent the necks of the flasks into S shapes, and then boiled the broth to kill any existing microbes.
After the broth had been sterilized, Pasteur broke off the swan necks from the flasks in Experiment 1, exposing the nutrient broth within them to air from above. The flasks in Experiment 2 were left alone.
Over time, dust particles from the air fell into the broken flasks of Experiment 1. In Experiment 2, dust particles remained near the tip of the swan necks, but could not travel against gravity into the flasks, keeping the nutrient broth sterile.
The broth in the broken flasks quickly became cloudy, a sign that it teemed with microbial life. However, the broth in the unbroken flasks remained clear. Without the introduction of dust--on which microbes can travel, no life arose. Thus, the Louis Pasteur experiment refuted the notion of spontaneous generation. In this experiment Pasteur used swan necked flask.
Therefore, the correct answer is option C.
Louis Pasteur designed an experiment to test whether sterile nutrient broth could spontaneously generate microbial life. To do this, he set up two experiments. In both, Pasteur added nutrient broth to flasks, bent the necks of the flasks into S shapes, and then boiled the broth to kill any existing microbes.
After the broth had been sterilized, Pasteur broke off the swan necks from the flasks in Experiment 1, exposing the nutrient broth within them to air from above. The flasks in Experiment 2 were left alone.
Over time, dust particles from the air fell into the broken flasks of Experiment 1. In Experiment 2, dust particles remained near the tip of the swan necks, but could not travel against gravity into the flasks, keeping the nutrient broth sterile.
The broth in the broken flasks quickly became cloudy, a sign that it teemed with microbial life. However, the broth in the unbroken flasks remained clear. Without the introduction of dust--on which microbes can travel, no life arose. Thus, the Louis Pasteur experiment refuted the notion of spontaneous generation. In this experiment Pasteur used swan necked flask.
Therefore, the correct answer is option C.
Suggest Corrections
0
Join BYJU'S Learning Program
Explore more
Join BYJU'S Learning Program
