Question

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please give me a short and simple conclusion of this activity.
Quality answer required
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Answer 1

HERE IT IS

Take two healthy potted plants which are nearly the same size.

Keep them in a dark room for three days.

Now place each plant on separate glass plates. Place a watch-glass containing potassium hydroxide by the side of one of the plants. The potassium hydroxide is used to absorb carbon dioxide.

Cover both plants with separate bell-jars as shown in Fig. .

Use Vaseline to seal the bottom of the jars to the glass plates so that the set-up is air-tight.

Keep the plants in sunlight for about two hours.

Pluck a leaf from each plant and check for the presence of starch as in the above activity.

Autotrophic Nutrition | Chapter-6 Life Processes | CBSE Class 10 Scienc

Question 1. Do both the leaves show the presence of the same amount of starch?

Answer. No, both the leaves do not show the presence of the same amount of starch, because in photosynthesis starch is produced using sun light, chlorophyll and CO2. In first set up availability of CO2 will be less for making starch by the plant leaves, as potassium hydroxide (KOH ) absorb the CO2. In second plant setup, the leaves will have more amount of starch.

Question 2. What can you conclude from this activity?

Answer. From this activity, we can conclude that amount of Carbon Dioxide (CO2) , essentially affects the process and outcome of photosynthesis.

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