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Which of the following precautions are t...

Which of the following precautions are to be taken for a successful run of the experiment to show that carbon dioxide is given out during respiration?
A. Cork should be air-tight
B. Seeds in the flask should be totally dry
C. A small tube with freshly prepared KOH solution should be placed in the flask
D. The end of the delivery tube should be above water level
The correct answer is :

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