Take two healthy potted plants which are nearly the same size.
Keep them in a dark room for three days.
Now place each plant on separate glass plates. Place a watch-glass containing potassium hydroxide by the side of one of the plants. The potassium hydroxide is used to absorb carbon dioxide.
Cover both plants with separate bell-jars as shown in Fig. 6.4.
Use vaseline to seal the bottom of the jars to the glass plates so that the set-up is air-tight.
Keep the plants in sunlight for about two hours.
Pluck a leaf from each plant and check for the presence of starch as in the above activity.
Do both the leaves show the presence of the same amount of starch?
✅ Answer: No.
What can you conclude from this activity?
✅ Answer: The amount of CO2 affects the process and outcome of photosynthesis.