Class 11 Exam  >  Class 11 Notes  >  Experiments on Photosynthesis for High School

Experiments on Photosynthesis for High School - Class 11 PDF Download

Write any 2 experiment related to photosynthesis ?
Ref: https://edurev.in/question/592526/Write-any-2-experiment-related-to-photosynthesis-

1. Experiment to demonstrate Moll’s half-leaf experiment for showing that CO2, light, chlorophyll and water are necessary requirements for photosynthesis:

Requirements:

A potted plant, caustic potash, wide- mouthed bottle, iodine, split cork, water.


Method:

1. De-starch a potted plant by putting it in complete darkness for two days.

2. Fill partly a wide-mouthed bottle with strong solution of caustic potash and fit a split cork on its mouth.

3. Insert about half of the portion of a leaf of the de-starched plant into the bottle through the split cork (Fig. 36).

Demonstration of Moll's half-leaf experiment


4. Place the whole apparatus in light after applying grease on the upper portion of split cork, and test the leaf for stach after about 10 hours.

Observations:

Portions of the leaf inside the bottle as well as in between the split cork show negative test for starch indicating the absence of photosynthesis while the portions outside the split cork show positive test for starch indicating the presence of process of photosynthesis in this region.

Results:

Negative starch test by the leaf portion present inside the bottle indicates that process of photosynthesis is absent in this region. This portion of leaf is getting all the essential requirements, i.e., light, chlorophyll and water except the CO2 because the latter is absorbed by the caustic potash. Thus, it can be concluded that CO2 is necessary for this process.

Negative test of starch, which is also shown by the portion of the leaf present in between the split of the split cork, can be explained that it is due to the lack of CO2 and light, thus indicating that both of them are essential requirements.

Positive test of starch shown by the portions of the leaf present outside the bottle indicates that photosynthesis process is continuously going on there because all the essential requirements, i.e., light, chlorophyll, water and CO2 are readily available to this portion.

That the chlorophyll is also an essential requirement for photosynthesis can be shown by testing starch in a variegated leaf. Only green portions of the leaf show positive starch test.


2. Experiment to demonstrate that oxygen is evolved during the process of photosynthesis:

Requirements:


Beaker, water, test tube, funnel, Hydrilla plant.

Method:

1. Fill the beaker with the water and take an aquatic plant, such as Hydrilla, in the beaker.

2. Cut the bases of the plants, tie them with a thread and cover them with an inverted funnel in such a fashion that the cut ends of plants are towards the neck of the funnel (Fig. 37).

 

Demonstration of evolution of oxygen during photosynthesis

3. Fill a test tube with the water and invert it on the upper end of the funnel.

4. Keep the whole apparatus in sunlight and observe for some time.

Observations:

From the cut ends of the plant some bubbles are coming out continuously and they are collected at the top of the test tube by displacing the water. On testing this gas it is found that it is oxygen.

Results:

The liberated gas is oxygen and it is evolved due to the photolysis of water under the process of photosynthesis. The liberated gas comes in the intercellular spaces and ultimately evolves out through the stomata.

The document Experiments on Photosynthesis for High School - Class 11 is a part of Class 11 category.
All you need of Class 11 at this link: Class 11

Top Courses for Class 11

FAQs on Experiments on Photosynthesis for High School - Class 11

1. What is photosynthesis?
Ans. Photosynthesis is the process by which green plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose (a type of sugar) and oxygen. This process takes place in the chloroplasts of the plant cells and is essential for the survival of plants and the production of oxygen on Earth.
2. What are the essential requirements for photosynthesis to occur?
Ans. Photosynthesis requires three main components: sunlight, carbon dioxide, and water. Sunlight provides the energy needed for the process, while carbon dioxide is the source of carbon that plants use to produce glucose. Water is necessary for the transport of nutrients and the release of oxygen during photosynthesis.
3. How does chlorophyll contribute to photosynthesis?
Ans. Chlorophyll is a pigment found in the chloroplasts of plant cells that plays a crucial role in photosynthesis. It absorbs sunlight and uses its energy to convert carbon dioxide and water into glucose and oxygen. Chlorophyll gives plants their green color and is essential for the absorption of light during photosynthesis.
4. What factors can affect the rate of photosynthesis?
Ans. Several factors can influence the rate of photosynthesis. These include the intensity and duration of sunlight, the concentration of carbon dioxide, the availability of water, and the temperature. If any of these factors are not optimal, the rate of photosynthesis may decrease, affecting the plant's growth and productivity.
5. How can photosynthesis be measured or studied in experiments?
Ans. Photosynthesis can be measured or studied in experiments using various methods. One common approach is to measure the production of oxygen by the plant during photosynthesis. This can be done by collecting the oxygen released by the plant and quantifying it using techniques such as gas chromatography. Another method involves measuring the rate of carbon dioxide uptake or glucose production by the plant. These measurements can provide insights into the efficiency and dynamics of photosynthesis.
Download as PDF
Explore Courses for Class 11 exam

Top Courses for Class 11

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Related Searches

Previous Year Questions with Solutions

,

Extra Questions

,

Sample Paper

,

Objective type Questions

,

shortcuts and tricks

,

Experiments on Photosynthesis for High School - Class 11

,

Semester Notes

,

Important questions

,

pdf

,

video lectures

,

Viva Questions

,

Experiments on Photosynthesis for High School - Class 11

,

mock tests for examination

,

ppt

,

Summary

,

study material

,

past year papers

,

Experiments on Photosynthesis for High School - Class 11

,

Free

,

Exam

,

practice quizzes

,

MCQs

;