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LAB ACTIVITIES

5. HEAT IS LIBERATED DURING RESPIRATION 6. CO IS LIBERATED DURING RESPIRATION
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AIM AIM
To prove that heat is liberated during respiration. To prove that CO is liberated during respiration.
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APPARATUS original preparation APPARATUS
lab activity
1. Thermometer 3. Thermos flask pl. scan QR 1. Germinating seeds 3. Small beaker
2. Germinating seeds 4. One holed rubber cork 2. Wide mouthed glass bottle 4. Limewater
DIAGRAM DIAGRAM
RAJU’S NATURAL SCIENCE ACADEMY

PROCEDURE
PROCEDURE 1. Take a wide mouthed glass bottle with germinating seeds.
1. Take some germinating seeds in a thermos flask. 2. Keep a small beaker with lime water into the bottle.
2. Close the thermos flask with one holed rubber cork. 3. Close the bottle tightly with rubber cork.
3. Insert a thermometer into the thermos flask and as shown in the diagram. 4. Keep the bottle undisturbed for two days.
4. Redcord the starting and for every two hours. OBSERVATION
OBSERVATION The colour of lime water turns milky white.
The temperature slowly increased in the thermometer. (CO is liberated from generating seeds during respiration)
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(heat is liberated from germinating seeds during respiration) INFERENCE
INFERENCE
This experiment proves that CO is liberated during respiration.
This experiment proves that heat is liberated during respiration. 2
PRECAUTIONS
PRECAUTIONS
1. Close the bottle with tight fitting cork.
1. Close the flask with tight fitting cork.
2. By using grease close the bottle without entering air.
2. The bulb of the thermometer should dip in the germinating seeds.
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