carbon dioxide is given out during respiration what precaution is necessary for this experiment?
Answers
Answer:
Explanation:AIM: To show experimentally that carbon dioxide is given out during respiration.
Materials Required : Germinating seed, conical flask, small test tube containing KOH, small thread, bent capillary tube, beaker and cork.
Procedure :
1. Take some germinating seeds of moong dal in a conical flask.
2. Place a small test tube containing KOH solution in hanging position in the flask.
3. Fix a bent capillary tube with one end in conical flask and other end in the beaker containing colored water.
4. Keep the set up for about two hours and observe change in water level in capillary tube.
292
Germinating seeds Observation :
1. Note the water level position at the start of the experiment.
2. Record the rise of water level in capillary tube.
3. Record water level change in record book.
Result and Inference :
1. Germinating seeds absorb oxygen of conical flask and release CO2
2. Released CO2 is absorbed by KOH
3. Water rise up in capillary to fill space created by gas.
4. Germinating seeds give out CO during respiration.
Precaution :
1. Mouth of conical flask should be air tight with cork.
2. Handle KOH carefully since it is corrosive.
3. Seeds should be germinated and respiring.
4. Hang small test tube with the help of a fine thread.
5. Colored water gives better observation.
Answer:
Experiment:
Objective:
To show experimentally that carbon dioxide is released during respiration.
Apparatus and Materials Required:
A conical flask, a beaker, a cork with a hole, a glass tube bent at right angles at two places, a small test tube, KOH solution, thread, coloured water.
Vaseline and germinating seeds of gram or pea.
Theory:
Respiration is a catabolic process which involves the breakdown of food or complex organic molecules into simpler products, with the release of energy. This process can take place either in the presence of oxygen (aerobic respiration) or in its absence (anaerobic respiration).
The overall reaction mechanism of aerobic respiration involves the oxidation of carbohydrate and the subsequent production of CO2, H2O and energy.
C6H12O6+6O2 → 6CO2 + 6H2O + Energy
Procedure:
1. Take the conical flask and place some germinating gram or pea seeds in it.
2. Insert the shorter end of the glass tube through the hole in the cork and fix it on the conical flask.
3. Before fixing the cork, hang a test tube containing KOH solution inside the conical flask with the help of a thread.
4. Take coloured water in the beaker and keep the longer end of the glass tube dipped inside it.
5. Make the conical flask airtight by applying Vaseline on its rim.
6. Note the initial level of water in the tube.
7. Observe and note the rise in the water level after an hour, without disturbing the apparatus.
Observations:
Experiment to Show that CO2 is Releaed During Respiration
Water level rises up in the bent tube.
Result:
The rise in the level of water indicates that CO2 is produced by germinating seeds during respiration. Actually, the germinating seeds respire and produce CO2, which is absorbed by KOH solution. This creates a vacuum in the conical flask. The air present in the bent glass tube moves into the conical flask. This pulls the water in the bent tube further up.
Precautions:
1. Keep the conical flask airtight.
2. Fix the shorter end of the glass tube in such a way that it does not touch the seeds.