Carbon dioxide is one of the four requirements for photosynthesis to take place. Again, since it is a requirement, photosynthesis will not take place without it.
PROCEDURE:
PROCEDURE:
- Set up two destarched potted plants as shown in the following figure.
- In set up X, a container containing saturated sodium hydrogen carbonate is placed (This is to provide the plant with carbon dioxide) whereas in set up Y, soda lime is used instead (This is to absorb the carbon dioxide inside the polythene bag as well as the carbon dioxide given off by microorganisms in the soil).
- Expose bot set ups to bright sunlight for two hours.
- After 2 hours, remove one leaf from each set up and test each leaf for the presence of starch using Iodine solution.
OBSERVATION
- The Iodine solution in the leaf taken from set up X turns blue black whereas the Iodine solution in the leaf taken from set up Y remain unchanged.
CONCLUSION
- The outcome of the experiment shows that carbon-dioxide must be present for plants to photosynthesize.
