Biology
The following diagram refers to an apparatus which is used to demonstrate a physiological process:
(a) What is the purpose of keeping potassium hydroxide solution in the test tubes X and Y?
(b) Why has the coloured water risen in tubing 1?
(c) What is the purpose of keeping boiled peas soaked in a disinfectant in test tube Y?
(d) Name the biological process which causes the above rise.
(e) Define the biological process shown in the experiment
Plants Respiration
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Answer
(a) To check the presence of Carbon dioxide, potassium hydroxide is placed in the test tubes X and Y. Potassium hydroxide has a special property of absorbing Carbon dioxide if produced.
(b) In the test tube X, when the process of respiration takes place, the oxygen is consumed that is present in the test tube. Due to respiration, Carbon dioxide that is produced is absorbed by the KOH in the test tube. Due to consumption of Oxygen, a space is developed causing the coloured water to rise in the tubing 1.
(c) It is because the seeds die once they are boiled and hence cannot undergo respiration. This is why respiration does not take place in test tube Y.
(d) The biological process that causes a rise is respiration.
(e) It is respiration. It is a catabolic process wherein energy is liberated from simple sugars to be able to carry out life processes.
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(a) Name the physiological process being studied.
(b) What is the function of soda lime in the bottle 'A' and why is limewater placed in bottle 'B'?
(c) What change would you expect to observe in bottle 'D'?
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(e) In order to obtain accurate results, the bottle ‘C’ should be covered with a piece of black cloth. Why?
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