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Question : 36
Total: 60
A student was asked to write a stepwise procedure to demonstrate that carbon dioxide is necessary for photosynthesis. He wrote the following steps. The wrongly worded step is-
Solution:
The stepwise procedure to demonstrate that CO 2
Step 1: Two healthy potted plants are kept in a dark room for at least three days.
Step 2: Both the plants are covered with separate bell-jars and Vaseline is used to seal the bottom of the jars to the glass plates so that the set-up is air-tight.
Step 3: Keep both the plants in sunlight for about two hours.
Step 4: Pluck a leaf from each plant. Remove the green coloured chlorophyll from the leaves by boiling them in alcohol. Wash the decolourised leaves with water and then pour iodine solution over them for starch test.
Thus, the wrongly worded step is step 3 .
Step 1: Two healthy potted plants are kept in a dark room for at least three days.
Step 2: Both the plants are covered with separate bell-jars and Vaseline is used to seal the bottom of the jars to the glass plates so that the set-up is air-tight.
Step 3: Keep both the plants in sunlight for about two hours.
Step 4: Pluck a leaf from each plant. Remove the green coloured chlorophyll from the leaves by boiling them in alcohol. Wash the decolourised leaves with water and then pour iodine solution over them for starch test.
Thus, the wrongly worded step is step 3 .
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