Solved 2024 Question Paper ICSE Class 10 Biology — Question 18
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In order to prove that carbon dioxide is necessary for (a) ............... , a potted plant is placed in dark for 48 hours to (b) ............... the leaves. A part of a leaf is inserted into a conical flask containing potassium hydroxide solution. This is to absorb (c) ............... from the flask. The plant is then placed in sunlight for a few hours. The experimental leaf is tested for starch. The part of the leaf that was inside the conical flask turns (d) ............... , whereas the part of the leaf outside turns (e) ............... in colour.
In order to prove that carbon dioxide is necessary for (a) photosynthesis , a potted plant is placed in dark for 48 hours to (b) destarch the leaves. A part of a leaf is inserted into a conical flask containing potassium hydroxide solution. This is to absorb (c) carbon dioxide from the flask. The plant is then placed in sunlight for a few hours. The experimental leaf is tested for starch. The part of the leaf that was inside the conical flask turns (d) brown , whereas the part of the leaf outside turns (e) blue-black in colour.