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?
Answers
Answer:
The exchange of gases in three test-tubes can be shown as in Fig.
Fig. (A) In test tube A; CO2 is produced by respiration of snail (No consumption of CO2).
(B) In test tube B; CO2 is produced by respiration of plant and much higher amount of CO2 is consumed during photosynthesis.
(C) In test tube C; CO2 is produced 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 tube A.
Test tube A will have the highest concentration of CO2. This is because test tube A contains snail. Snail is an organism that breathes in O2 and breathes out CO2. Hence, CO2 concentration increases in test tube A.
Test tube B contains a water plant, which takes in CO2 for food synthesis and gives out O2. Hence, more O2 concentration is found in test tube B.
Test tube C contains both a snail and a plant. The CO2 produced by the snail is utilized by the plant for its food synthesis and the O2 released by the plant is utilized by the snail for respiration.
Therefore, test tube A has the highest concentration of CO2.
