Take three test tubes and label them as A, B and C. Fill 34th 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 CO2 (carbon dioxide) level will be higher? What does this experiment show? Explain what happens in each test tube separately. [5 MARKS]
Take three test tubes and label them as A, B and C. Fill 34th 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 CO2 (carbon dioxide) level will be higher? What does this experiment show? Explain what happens in each test tube separately. [5 MARKS]
Observations: 1 Mark each
1. Test tube A will have the highest concentration of CO2.
2. The experiment shows respiration in animals and plants.
3. Test tube A: During breathing, the snail inhales dissolved oxygen from water and releases CO2.
4. Test tube B: The water plants along with respiration performs photosynthesis (food preparation); therefore it absorbs CO2 and releases O2.
5. Test tube C: The CO2 released by the snail will be used by the plant for photosynthesis, thus there will be a balance of gases.
Observations: 1 Mark each
1. Test tube A will have the highest concentration of CO2.
2. The experiment shows respiration in animals and plants.
3. Test tube A: During breathing, the snail inhales dissolved oxygen from water and releases CO2.
4. Test tube B: The water plants along with respiration performs photosynthesis (food preparation); therefore it absorbs CO2 and releases O2.
5. Test tube C: The CO2 released by the snail will be used by the plant for photosynthesis, thus there will be a balance of gases.
