Question

demonstrate an experiment to show that sunlight is necessary for photosynthesis​

Answer 1

$\huge\underline\red{experiment \ to \ prove \ light \ is \ essential \ for \ photosynthesis}$

$\huge\underline\red{Experiment}$

$\underline\green{Objective}$

To show experimentally the light is essential for photosynthesis

$\underline\orange{Apparatus \ and \ materials \ required}$

A healthy potted plant, a petri dish, a beaker containing water, forceps, a water bath a piece of wire, a tripod, a burner, a box of matches, alcohol, a strip of black paper, iodine solution, and clips.

$\underline\pink{theory}$

• Photosynthesis is a biochemical process by which green plants synthesize simple sugar in the present of sunlight using carbon dioxide from the atmosphere and water from the soil. This simple sugar(glucose) is later converted to starch.

$6Co_{2}+12H_{2}O\frac{chlorophyll}{sunlight}C_{6}H_{12}O_{6}+6H_{2}O+6O_{2}$

• The most important factor for photosynthesis is light. The rate of photosynthesis depends on the quantity and quality of light. The chlorophyll molecule in green leaves absorb light, get excited electrons. The emitted electrons are used in the production of Adenosine Triphosphate(ATP). Finally the solar energy is converted into chemical energy and stored in the glucose produced.
• The rate of photosynthesis is the maximum in the presence of red and blue light. While in the green light the rate is minimum because green light is reflected by the chlorophyll molecules.

$\underline\blue{Procedure}$

1. Take the potted plant and keep it in  dark place for 2-3 days so that the leaves get destarched
2. Cover a part of one of its leaves with the strip of black paper. Make sure that you cover both the sides of the leaf
3. Now place this plant in the sunlight for 3-4 hours
4. Pluck the selected covered leaf and remove the black covering it
5. Place this leaf in the beaker containing water and boil it for about 10 minutes
6. Take out the leaf and now boil it in alcohol, using the water bath, for 10 minutes. This removes the chlorophyll
7. Take out the leaf and wash it under water
8. Place this leaf in the petri dish and put a few drops of iodine solution on it. Now observe the change in color

$\underline\green{Observations}$

The leaf turns blue-black except in the covered region. As this covered region did not receive light, photosynthesis did not occur. Hence no starch was formed there. The uncovered region received light and starch was formed there due to photosynthesis

$\underline\red{Result}$

Light is essential for photosynthesis.

$\underline\blue{Precautions}$

1. Before starting the experiment, the leaf must be destarched
2. The leaf must be covered with black paper properly to prevent the entry of light
3. Boiling the leaf in alcohol should be done in the water both.

Answer 2

Answer:

please follow the photo