Question

How were the designs of Pasteur’s and Redi’s experiments different? Pasteur experimented with rotting meat; Redi experimented with broth. Redi experimented with rotting meat; Pasteur experimented with broth. Pasteur was able to show spontaneous generation was false, but Redi was not. Redi was able to show spontaneous generation was false, but Pasteur was not.

Answer 1

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Answer 2

Answer:

Redi experimented with rotting meat; Pasteur experimented with broth.

In this way the designs of Pasteur’s and Redi’s experiments were different.

Explanation:

• Francesco Redi tested the hypothesis of spontaneous generation by applying the scientific methods of making observations, asking questions, formulating a hypothesis and designing experiments to test the hypotheses.

• Redi observed that flies and then maggots could be seen around pieces of meat that were left out in the open i.e. exposed to air.

• Later, Redi formulated the hypothesis that only flies can make flies and that rotting meat cannot be transformed into flies.

• Redi tried to test his speculation by playing out the accompanying analysis. He put bits of meat into three glass containers.
• The principal container was left open, the second was covered with a loose netting, and the third was fixed.
• All containers were presented to flies in the encompassing room. That's what Redi anticipated if meat couldn't be changed into flies, then the fixed compartments shouldn't create either worms or flies. Though on the off chance that the meat can be so changed, then the fixed container ought to likewise foster parasites and flies.

• Redi recorded the presence or nonattendance of flies and parasites in every one of the three kinds of containers. As he anticipated, neither flies nor slimy parasites were tracked down in the fixed containers, while in the open containers, worms and flies were plentiful. In the containers covered with mesh, parasites were tracked down inside the actual netting, yet not on the meat inside the container.

• Unfortunately, Redi’s experiment did not convince everyone. Some argued that while spontaneous generation might not apply to larger organisms like maggots and flies, it might still apply to smaller microbes only.

The result of the question was finally answered definitively in the late 1800s by Louis Pasteur, in his now classic experiment.

• Pasteur hypothesised that if cells could arise from nonliving substances, then they should appear spontaneously in sterile broth.

• To test his speculation, he made two treatment gatherings: a broth that was presented to a wellspring of microbial cells, and a broth that was not. For his control treatment, Pasteur involved a straight-necked jar that permitted particles in the air to fall into the stock put away in the jar.
• For his trial treatment, Pasteur utilized a swan-necked flask. The neck shape and length guaranteed that no cells could enter the stock from the air.
• He heated the broth to kill any current living beings. He then let the broth cool and allowed it to sit for several days, after which he removed the necks of the flasks and checked the broth for the growth of any organisms.

• Pasteur found living organisms only in the control flask. Because the experimental flask remained sterile, the hypothesis of spontaneous generation was rejected.

• By changing a single variable–the shape of the flask neck–Pasteur was able to conclude that cells were not generated spontaneously but were entering the broth from the surrounding air. Microorganisms, carried by dust particles, fell into the straight-necked flask.
• However, the swan neck trapped the particles, preventing cells from entering the broth.    

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