Question

3. Explain with an activity that carbon dioxide and water are necessary for
photosynthesis​

Answer 1

Answer:

Activity

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.

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Answer 2

Carbon dioxide and water both are very very important for photosynthesis as plant use both of them and other substances to produce energy or food

plant use carbon dioxide to produce glucose and water to produce oxygen.

when water molecules split it provides electron and oxygen. electron is used in production of energy by photosynthesis

you will understand the importance water when you stop watering plant you can observe that within few days plant get dry and eventually dies