Aim : To prove that heat is liberated during respiration.
Apparatus : Thermos flasks, two thermometers, rubber, corks, dry seeds, germinating seeds.
Procedure :
(1) Take a handful of moong or bazra seeds.
(2) Soak the seeds in water a day before experiment.
(3) Keep these soaked seeds in a cloth pouch and tie with a string tightly.
(4) Next day collect the sprouts / germinated seeds from the pouch in a thermos flask and take dry seeds in another thermos flask.
(5) Remove the lid and prepare a cork through which you can bore a hole to insert thermometers into two flasks in such a way that the bulb of the thermometer should dip into the germinating and dry seeds.
(6) Close the thermos flaks with tight fitting rubber corks.
(7) Record the initial temperature in both the flasks and record it for every two hours for atleast 24 hours.
Observation : Constant increase in the temperature is observed in thermometer placed in the germinating seeds.
Result : Hence it is proved that germinated seeds respire and liberate heat which is responsible for increase in the temperature.
Result : Hence it is proved that germinated seeds respire and liberate heat which is responsible for increase in the temperature.
Dry seeds : If we conduct this experiment with dry seeds, there will be no change in the temperature in thermometer. The dry seeds will not perform respiration and hence there is no rise in temperature.
