Question

3. During an experiment Kartik observed that teacher has kept potassium hydroxide in a watch glass near a plant. When asked, teacher replied a. Potassium hydroxide is used to absorb carbon dioxide b. Potassium hydroxide is used to absorb oxygen e. Potassium hydroxide is used to absorb hydrogen d. None of the above he water is released from​

Answer 1

Answer:

Starch was not found in any leaves

Explanation:

The leaf of the potted plant was covered with a piece of black cloth to destarch it. Potassium hydroxide solution is to absorb the carbon dioxide gas from the air present in the glass bottle so that no carbon dioxide is left in the air inside the glass bottle. He will find that the leaf which was inside the glass bottle having no carbon dioxide around it, does not turn blue on adding iodine solution showing that no starch is present in this leaf. From this observation, we conclude that the photosynthesis to make starch in the leaf does not take place without carbon dioxide. And by covering the flask containing leaf B with black cloth, the leaf wont get exposure of sun light and photosynthesis won't happen. From this observation, we conclude that photosynthesis (to make starch) takes place in the presence of sunlight. Hence both the leaves do not have starch.