Take three test tubes and label them as A, B and C. Fill 34th of each with wat

Question

Take three test tubes and label them as A, B and C. Fill $\frac{3}{4}$ th of each with water. Keep a snail in test tube A, a water plant in test tube B and in C, keep both snail and plant. In which of these test tubes $C O_{2}$ (carbon dioxide) level will be higher? What does this experiment show? Explain what happens in each test tube separately. [5 MARKS]

Options:

Answer: Option A
:

Observations: 1 Mark each
1. Test tube A will have the highest concentration of $C O_{2}$ .
2. The experiment shows respiration in animals and plants.
3. Test tube A: During breathing, the snail inhales dissolved oxygen from water and releases $C O_{2}$ .
4. Test tube B: The water plants along with respiration performs photosynthesis (food preparation); therefore it absorbs $C O_{2}$ and releases $O_{2}$ .
5. Test tube C: The $C O_{2}$ released by the snail will be used by the plant for photosynthesis, thus there will be a balance of gases.