what four step to show that co^2 is given out during respiration
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.
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what four step to show that co^2 is