Question

Hi buddies ❤️

How do you prove that sunlight is essential for Photosynthesis ?

•What apparatus required?

•What procedure will you follow ?

•What are your observations ?

Answer 1

$\mathfrak{Answer}$

AIM :- To prove that sunlight is essential for photosynthesis

APPARATUS :- Potted plant , iodine solution,black paper ,light screen

PROCEDURE :-

1.Take a potted plant and destruct it by keeping in the dark for 3-4 days

2.Cover one of its leave with black paper where a design is cut.

3.Fix the black paper on leaf and ensure that light does not enters the black paper.

4.Place this plant in the sun for few hours

5.After placing ,bring the plant and take the leaf which was covered with black paper and test the leaf with iodine solution [starch test] and observe

OBSERVATION :-

We observe that the place where the design is cut in black paper on leaf ,turns blu black indicating the presence of starch.

RESULT :-

The experiment proves that light is necessary for photosynthesis.

Answer 2

hey mate... ❤️

here is your answer...

Experiment to Prove Light is Essential for Photosynthesis!

Experiment:

Objective:

To show experimentally that light is essential for photosynthesis.

Apparatus and materials required:

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

Theory:

Photosynthesis is a biochemical process by which green plants s5mthesize simple sugar in the presence of sunlight using carbon dioxide from the atmosphere and water from the soil. This simple sugar (glucose) is later converted to starch.

6CO2 + 12H2O ChlorophyII / Sunlight C6H12O6 + 6H2O + 6O2

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 and emit 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 lights, while in green light the rate is minimum because green light is reflected by the chlorophyll molecules.

Procedure:

1. Take the potted plant and keep it in a 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 sunlight for 3—4 hours.

4. Pluck the selected covered leaf and remove the black paper 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 running water.

8. Place this leaf in the Petri dish and put a few drops of iodine solution on it. Now observe the change in colour.

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.

Result:

Light is essential for photosynthesis.

Precautions:

1. Before starting the experiment, the leaf must be distracted.

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 bath.

hope it helps...