write about an experiment you conducted in the classroom using yeast to know about the respiration when oxygen is in short supply
Answers
Explanation:
When active (live) yeast has both sugar and oxygen available to it, it 'breathes' by a process called aerobic respiration. ... If no oxygen is available, yeast will switch over to a process called anaerobic respiration - in this process, glucose (sugar) is fermented to produce energy, carbon dioxide, and ethanol.
An experiment I conducted in the classroom using yeast to know about respiration when oxygen is in short supply.
An apparatus is being set up to experiment in the classroom.
Materials required:
Flask, split-corks, glass tubes, thermometer, glucose solution, yeast, wash bottles, and a solution of bicarbonate.
The procedure is:
- After heating the glucose solution, it is poured into a flask.
- The glucose solution in the flask is heated again to remove the oxygen and thereafter it is cooled down.
- Yeast is then added to the flask and cork is placed at the mouth of the flask.
- The oxygen supply in the flask is stopped by pouring some liquid paraffin into the mixture.
- Next, the gas that is released gets collected in a separate tube. This tube has a bicarbonate solution in it that helps in observing the result.
Observations are:
- The experiment is observed for 2 days straight and it is observed that the limewater or the bicarbonate solution turns milky.
- Other things noted in the experiment are an increase in temperature due to the respiration process of yeast cells and an odor of alcohol that could be smelled from the flask.
Result:
The inference of the experiment would be that the indications of the limewater turning milky or the high release of energy prove that when oxygen is in short supply, the yeast respire through an anaerobic mode of respiration.
Hence, the above experiment has been conducted in the classroom using yeast to know about the yeast's mode of respiration in absence of oxygen.
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