This test plant setup See Figure 1 is placed in room with no light and then it will be exposed to light with varying degrees of intensity based on distance. This green light that can be seen cannot be used by the plant for photosynthesis. Since glucose levels within plants are difficult to measure, scientists utilize the amount of carbon dioxide assimilation or its release as a means to measure photosynthetic rates. Heat could become a factor among the three already tested. Then place a short-stemmed funnel over some pondweed in a beaker of water.
This will be done by measuring the bubbles of oxygen and having a bulb for the light intensity variable. The other two variables can be controlled easily. The wood should burn more rapidly in the oxygen gas in the test tube than in the air. Glucose is a simple sugar that plants use for energy and as a building block for larger molecules. Plants absorb both red and purple light waves, however because purple wavelengths are shorter, they contain more energy.
The number of bubbles represents the amount of oxygen created in a 30 second trial, and therefore represents how well photosynthesis occured. The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place Hypothesis: I predict that as the intensity of light is increased, so would the photosynthesis. With the possible exception of the elodea plant and a test tube, all the other items can be purchased from the local supermarket, hardware, homebuilding or big box retail Wal-Mart, Target, etc store. Plants also need plenty of water too. There is a slight risk of infection from pond water, so take sensible hygiene precautions, cover cuts and wash hands thoroughly after the work is complete. Measuring photosynthesis via the uptake of carbon dioxide Using 'immobilised algae' - It's easy and accurate to measure the rate of photosynthesis and respiration using immobilised algae in hydrogen carbonate indicator solution - known as the 'algal balls' technique. After reporting findings, we determine the oxygen production at the ideal variable level Best For: Biology - ExploreLearning Staff.
Light Color Number of Bubbles Red Blue Green Colorless 12 17 5 20 Colorless light is the best light to carry out photosynthesis because it is a combination of all the wavelengths and the plant can absorb each wave length rather than only one. If a plant does not get enough of either of these things, photosynthesis will not happen as quickly, if at all. Disclaimer and Safety Precautions Education. To reduce this risk wet the used match head thoroughly with water than discard. Plant biomass is the food and fuel for all animals. Therefore, an increase in temperature will also produce an increase in oxygen production.
It was found after the experiment was conducted that the hypothesis was proven wrong. In photosynthesis, a plant takes carbon dioxide from the air and water from the soil and uses the light from sunlight to turn them into food. Full text Full text is available as a scanned copy of the original print version. Time course of low temperature inhibition of sucrose translocation in sugar beets. Heat could become a factor among the three already tested. Place the 60watt lamp at these distances away from the beaker once you have started timing: 20cm; 15cm; 10cm; 5cm; 0cm Decrease the distance every 3 minutes 5. The experiment went good due to the reliable results with the constant numbers.
Check the weed to see if it is bubbling. Title: Photosynthesis, Authors: David O. Chloroplasts act as a energy transducers, converting light energy into chemical energy. Colorless light is the optimal light color for absorption during photosynthesis reactions. I can tell this because as I increase the light intensity, the amount of bubbles increased also oxygen. The green pigment involved in photosynthesis is chlorophyll.
Blackmen, an English plant physiologist, found that there was one set of light dependent reactions which were also temperature independent. If there is enough water, carbon dioxide, and the temperature is right, light becomes the factor which will affect photosynthesis. Translocation and accumulation of translocate in the sugar beet petiole. Apparatus: - Test tube- this is used to collect the left over oxygen. . Is elodea's photosynthetic performance analogous to that of oceanic organisms that undergo photosynthesis at various ocean temperatures? Depending on the particular plant in question, set the greenhouse thermostat to a temperature within this range for best results.
It provides the energy for the process to happen. The fact that no gas was produced while the setup was kept in the dark showed that light was the cause of the production of oxygen. This was because, while plotting all the points in the graph, there was an anomalous result that occurred. After exploring the students' understanding of photosynthesis and how the Gizmo works, I have the student s return the Gizmo to the default setting and then assign each group of students a variable to test. The graph of photosynthetic rate versus temperature presents a curved appearance with the peak rate occurring close to room temperature.