Science, asked by kppgohil82, 2 months ago

write the aim of the experiment on potted plants kept with potassium hydroxide and without potassium hydroxide under a bell jar to assess the rate of photosynthesis​

Answers

Answered by vanshika372448
2

answer : To show that carbon dioxide is necessary for photosynthesis.

Explanation:

Aim :

To show that carbon dioxide is necessary for photosynthesis.

Materials Required :

Two healthy potted plants of same size, two glass plates, two

bell jars, vaseline, watch glass, potassium hydroxide, alcohol,

spirit lamp and beaker.

Procedure :

1. Keep the potted plants in dark for three days, so that the

leaves are destarched.

2. Place the potted plant (a) on a glass plate and put a watch

glass containing potassium hydroxide (KOH) by the side of

the pot. Cover it with a bell jar.

3. Place the other potted plant (b) on second glass plate and

cover it with a bell jar.

4. Use Vaseline to seal the bottom of jars to the glass plates so

that the set up is air tight.

5. Keep the plants in sunlight for two hours.

6. Pluck a leaf from each plant and test the same

for the presence of starch.

Observation :

The leaf of plant (b) without potassium hydroxide

turns blue-black, while the leaf of plant (a) with

potassium hydroxide remains pale coloured or

colourless.

Conclusion :

This experiment demonstrates that the leaf of plant

(b) has synthesised starch by photosynthesis.

Leaf of plant (a) has not synthesised starch as it does

not contain carbon dioxide which is essential for

photosynthesis. CO2

is absorbed by potassium

hydroxide. So, photosynthesis did not occur in

plant (a).

As given image in attachment:

Experimental set up (a) With potassium hydroxide

(b) Without potassium hydroxide.

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