Write an activity to show that during respiration yeast produced carbon dioxide with aim, meterials,onsevation, results
Answers
Answer:
Step-by-step explanation:
Aim :
To show activity that carbon dioxide is produced by yeast during the process of respiration.
Principle/Theory:
The process of respiration is a biochemical process wherein food, glucose to be precise is oxidized and energy is released. In this experiment, gram seeds(moistened) are used. The purpose of using these seeds is that they release carbon dioxide and are respiring actively. The released carbon dioxide is absorbed by the solution of KOH.
Material Required:
Soaked gram seeds
U-shaped delivery tube
Conical flask
Blotting paper(moist)/cotton wool
Thread
Water
Beaker
Test tube
Rubber cork with a single hole
Freshly prepared KOH solution (20%)
Vaseline
Procedure :
Germinate close to 25 seeds. This can be done by wrapping them in moist blotting paper or cotton wool for around 3 to 4 days
Set up the germinated or sprouted seeds in the conical flask. Spray some water into the flask to dampen the seeds
With the help of a thread, suspend the conical flask containing the test tube having a freshly prepared 20% KOH solution.
Use the rubber cork to seal the opening of the conical flask.
One edge of the U-shaped glass delivery tube present in the conical flask should be inserted through the hole in the rubber cork. The other end should be placed into a beaker that is saturated with water
All attachments of the set-up should be sealed. This can be done using Vaseline to create an air-tight environment
The initial water level present in the U-shaped delivery tube needs to be marked.
Leave the experimental set-up uninterrupted for 1 to 2 hours. Observe the fluctuations in the water level in the tube.
Observation:
Careful observation after a certain period of time reveals that the water level in the U-shaped delivery tube has risen in the beaker.
Conclusions :
The rise in level water indicates that carbon dioxide is released as a result of germinating gram seeds during the process of respiration in the conical flask. The carbon dioxide that is released in the process is absorbed or consumed by the KOH solution that is suspended in the test tube in the conical flask, creating a vacuum or a void in the flask resulting in the upward water movement in the tube. Hence the water level in the tube changes.