Photosynthesis, Plant converts solar energy into chemical energy.

 To demonstrate that the light is necessary for photosynthesis.


AIM  :  To demonstrate that the light is necessary for photosynthesis.


PRINCIPLE :  During the process of photosynthesis plant converts solar energy into chemical energy ( glucose ). This experiment indicates that without light, food cannot be synthesized.

MATERIALS :  Ganong’s screen, a twig, iodine, ventilated box,  etc.

Plant with leaf

Photosynthesis, light is necessary.

Cobalt Chloride paper on leaf.

Sun light makes Photosynthesis process.

Result (Observation) :

The positive iodine test shows presence of starch only is the region where letter “A” was cut in the black paper.

Conclusion :

The final product of the photosynthesis is starch. It is found in the leaf only when all the essential factors for the photosynthesis are available to the plant. The iodine test shown that starch is manufactured in the region exposed to the light, while the region of the leaf which was covered with black paper does not show any starch.

Application :

From this experiment we can demonstrate to the students that for the synthesis of starch, light is necessary.

Oxygen is evolved during photosynthesis. Std 10 to 12

AIM :  To show that oxygen is evolved during photosynthesis.

PRINCIPLE :  During photosynthesis photolysis of water takes place  and oxygen is released.

Equation for oxygen evolved during photosynthesis.

MATERIALS       :  Beaker, funnel, test tube, twig of Hydrilla, water.

  

Oxygen evolved during Photosynthesis

Bubble comes out 

Oxygen evolved during photosynthesis

Result :

Air bubbles released from the cut end of plant twigs move up through the funnel and get collected in the test tube.

Conclusion :

The oxygen produced during photosynthesis moves up in thee form of bubbles and getts collected in the test tube.

Application : 

During photosynthesis oxygen evolved and released in the atmosphere. It can be shown to the students by the above experiment.           

Wilmot’s bubbler Light Intensity, Light Quality and Concentration of Carbon dioxide on the Rate of photosynthesis

Study of the Effect of Light Intensity, Light Quality and Concentration of Carbon dioxide on the Rate of photosynthesis using Wilmott’s bubbler

AIM :-

To study the effect of light intensity, light quality and concentration of carbon dioxide on the rate of photosynthesis using Wilmott’s bubbler

INSTRUMENTS AND MATERIALS

Wilmott’s bubbler, Cellophane papers of red, blue and green colours,

Hydrilla (fresh plants), Vaseline, Sodium bicarbonate, water

Experiment measuring the rate of Photosynthesis by Wilmott’s Bubbler

Observation table fot Wilmot;s bubbler Experiment

AIM 2 :-

To study the effect of light quality on the rate of photosynthesis.

INSTRUMENTS AND MATERIALS

Wilmott’s bubbler, Cellophane papers of red, blue and green colours,

Hydrilla (fresh plants), Vaseline, Sodium bicarbonate, water

Red Cellophane paper Experiments

Blue Cellophane paper Experiments

Green Cellophane paper Experiments

Observation table with cellophane paper

Wilmot's Bubbler Video

Study of the Effect of Light Intensity, Light Quality and Concentration of Carbon dioxide on the Rate of photosynthesis