Question

Take three test-tubes. Fill each of them 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 $C{O}_2$?

Answer 1

• The test tube A will have the highest concentration of carbon dioxide. The carbon dioxide($C{O}_2$) comes because of respiration by the snail. Snail is an organism that breaths in $O_2$ and breaths out ($C{O}_2$).Hence,($C{O}_2$ concentration increases in test tube A.
• The test tube B contains a water plant, which takes is ($C{O}_2$) for photosynthesis and gives out $O_2$.Hence, more $O_2$ concentration is seen in test tube B.
• The test tube C contains both snail and a water plant. The $C{O}_2$) produced by the snail is utilized by the plant for the photosynthesis and the $O_2$ released by the plant is utilized for snails respiration.
• Therefore The test tube A will have the highest concentration of carbon dioxide.