Write four steps to show co2 is given out during respiration on
Answers
To show experimentally that carbon dioxide is released during respiration take 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.
Step 1
Place some germinating gram or pea seeds in the conical flask. Insert the shorter end of the glass tube through the hole in the cork and fix it on the conical flask.
Step 2
Hang a test tube containing KOH solution inside the conical flask with the help of a thread. Fix the cork.
Step 3
Take coloured water in the beaker and keep the longer end of the glass tube dipped inside it. Apply some Vaseline on the rim of the conical flask to make it airtight. Note the level of water in the tube.
Step 4
After an hour observe and note the rise in the water level without disturbing the apparatus. Water level rises in the bent tube.
This shows that CO2 is produced by the germinating seeds during respiration.
The germinating seeds respire and produce CO2. The KOH solution absorbs it. Due to this a vacuum is created in the conical flask. The air in bent glass tube moves to the conical flask. As a consequence the water level rises in the bent tube.
Write four steps to show that 2co is given out during respiration