Describe an experiment to prove that carbon dioxide is essential for the process of photosynthesis.
Answers
Answer:
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Explanation:
Experiment showing that carbon dioxide is essential for photosynthesis is explained below:
Materials required: A potted plant, wide mouthed bottle, a cork, potassium hydroxide solution.
Procedure:
(i) Take a potted plant with elongated leaves which have been destarched by keeping the plant in dark for three to four days.
(ii) Take an empty bottle and put a little amount of potassium hydroxide (KOH) in it.
(iii) Now cut the cork of the bottle into two parts and place it on one of the leaves of the potted plant in between the two parts of the cork.
(iv) Now put the bottle in the presence of sunlight for about 72 – 96 hours.
(v) Now test the leaf for the presence of starch.
You will observe that the part of the leave exposed to the sun light and atmospheric air became bluish- black and the one inside the bottle containing potassium hydroxide which absorbs carbon dioxide in the bottle remained colourless.
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Answer:
Yes, it will work satisfactorily. Lime water absorbs carbon dioxide and hence there is no carbon dioxide for the leaf and hence photosynthesis does not take place and no starch is prepared. Hence on iodine test, the presence of starch is negative and thus proves that carbon dioxide is required for photosynthesis.
We can put half of the leaf inside the flask and half of it outside. So, the inside part will not show presence of starch and the outside part will show presence of starch.