An experiment was set up as shown in the diagram below:
Soda lime prevents
entry of CO2.
Well watered
potted plant
KOH solution
a) What is the aim of the experiment?
b) Why is potassium hydroxide kept inside the bell jar?
c) What is the use of soda lime?
d) What would be the next and final step in this experiment?
e) What would be the result of the final step?
Answers
Explanation:
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. 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. Remove the green coloured chlorophyll from the leaves by boiling them in alcohol. Wash the decolourised leaves with water and then pour iodine solution over them.Observe the change in colour of the leaves. We will find that the leaf from the plant (which was inside the bell jar containing potassium hydroxide which absorbed the carbon dioxide), does not turn blue-black on adding iodine solution showing that no starch is present. So we can conclude that the photosynthesis cannot be carried out without carbon dioxide