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Question -

Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B, and in C keep snail and plant both. Which test-tube would have the highest concentration of CO2?



Answer -

The exchange of gases in three test-tubes can be shown as in Fig.

Fig. (A) In test tube A; CO2 is produced byrespiration of snail (No consumption of CO2).
(B) Intest tube B; CO2 isproduced by respiration of plant and much higher amount of CO2 is consumed duringphotosynthesis.
(C) Intest tube C; CO2 isproduced by respiration of snail and plant and CO2 is consumed during photosynthesis.
It is clear from the above observation that the highest concentration of CO2 will be in test tubeA.

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