Question

07. Distinguish between Photosynthesis and Respiration. Wite the chemica
equation for each.
tututo test the presence of starch in leaves.​

Answer 1

Answer:

The principal difference, however, between photosynthesis and respiration is that photosynthesis utilizes carbon dioxide and water in the presence of light to produce glucose and oxygen, whereas respiration uses oxygen and glucose to power the activities of the cell.

                 Iodine solution is used to test leaves for the presence of starch. You need to:

• heat a plant leaf in boiling water for 30 seconds (this kills the leaf, stopping any chemical reactions)

• add the leaf to boiling ethanol in a water bath for a few minutes (the boiling ethanol dissolves the chlorophyll and removes the green colour from the leaf - it turns white so it is easy to see the change in colour)
• wash with water to rehydrate and soften the leaf and spread onto a white tile
• add iodine solution from a dropping pipette

After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black.

Explanation:

Answer 2

Answer:

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