Question

write four steps to show that co 2 is given out during respiration?

Answer 1

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.

Answer 2

Hey Mate here's your answer:
Take two test tubes each of them half filled with lime water.Using two holes stoppers ,glass tubes and clips ,set up the apparatus . Use the rubber tube at the middle to breathe in and out through the mouth . As you suck in air through rubber tube , open clip X and close clip Y .The inhale air passes through lime water in test tube A . As you exhale through the rubber tube , open clip Y and close clip X . The exhaled air passes through the lime water in the test tube B
This shows that exhaled air has more co2 than inhaled air .
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