Question

Explain the activity which shows that sunlight is necessary for photosynthesis

Answer 1

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heat a plant leaf in boiling water for 30 seconds this stops its chemical reactions heat it in boiling ethanol for a few minutes this removes most of its colour)wash with water and spread onto a white tileadd iodine solution from a dropping pipette

After a few minutes, the parts of the leaf that contain starch turn blue-black.

Note that ethanol is heated using a hot water bath. Ethanol boils at 78°C, so a tube of it boils when placed in a beaker of hot water. This is safer than using a Bunsen burner because ethanol isflammable.

Variegated leaves have green parts and white parts Only the parts that were green become blue-black with iodine solution, showing the importance of chlorophyll in photosynthesis.

A plant can be ‘de-starched’ by leaving it in the dark for a few hours. Parts of its leaves are covered with dark paper, and the plant is left in the light for a few hours. Only the uncovered parts become blue-black with iodine solution, showing the importance of light in photosynthesis.