It is assumed that the rate of oxygen production is proportional to the rate of photosynthesis. Further any increase in light intensity will not result in an increase in the rate of photosynthesis. The faster the oxygen production the faster the photosynthesis.
Some days or even weeks latera disk is cut out of the other half of the leaf, dried and weighed. If you do not see bubbles right away, re-cut and crush the stems, experiment with moving the light closer to the apparatus or remove the heat sink if using CFL bulbs.
This would have been subtracted from the rates of photosynthesis of the other treatments to make the correction. It might ok just to measure the speed of bubble down the capillary tube, BUT what happens if it fills with oxygen gas - you won't see any movement See method 3 next.
Give students time to design experiment and do a trial run. Chlorophyll absorbs the energy of sunlight. Using the same piece of elodea for each experiment was impractical as the elodea's photosynthesis rate decreased over time.
Count the bubbles to measure the rate of reaction Design 3: Write out a balanced equation for photosynthesis: Check the Elodea to see if it is bubbling.
You should see air coming out the sides of the disks. If it was a stream of just gas or liquid, you couldn't make any measurements. The accumulated products increase the rate of respiration. This is the mean rate of bubble production. Rate of photosynthesis experimental method 3.
The test tube can be inverted and the air pocket can be measured. When varying the temperature its not easy to maintain a constant temperature - if it falls a little, you could use the average temperature, not as accurate, but better than nothing.
On the day of the experiment, cut 10 cm lengths of Elodea, put a paper-clip on one end to weigh them down and place in a boiling tube of water in a boiling tube rack, near a high intensity lamp, such as a halogen lamp or a fluorescent striplight.
In cold weather, heaters might be employed in a greenhouse because the temperature may be too low for efficient photosynthesis for plant growth. It is suggested that C4 plants have photorespiration and high O2 stimulates it.
The water in the beaker is meant to absorb the heat from the light. Class discussion will connect the lab to world issues; food availability, global climate change.
Students should collect and set up all the other apparatus before collecting the boiling tube of pond weed. A greenhouse warms up by trapping the heat radiation from the sun - the 'greenhouse effect'.
The leaf area of the plants should be measured so you can compensate for plant size. The rate increases at a steady rate as the light intensity increases until near the end of each line where the rate of increase decreases. BUT the light intensity is inversely proportional to the distance between the light source and the experiment tube squared.
With limited water, enzymes, and other reagents of photosynthesis, increasing light intensity could eventually no longer increase rate of photosynthesis. The removal of water from the protoplasm also affects its colloidal state, impairs enzymatic efficiency, inhibits vital processes like respiration, photosynthesis etc.
Based on our data and research, we can determine that temperature affects the rate of photosynthesis in plants. Plants have an optimum temperature for photosynthesis, which varies. This is the temperature at which the rate is the fastest.
If the temperature is decresed, then so is the rate of photosynthesis. But how can we measure the rates at which photosynthesis takes place?
The quantities are mind boggling. A hectare (e.g. a field m by m) of wheat can convert as much as 10, kg of carbon from carbon dioxide into the carbon of sugar in a year, giving a total yield of 25, kg of sugar per year.
This activity will allow students to measure the rate at which the photosynthesis process occurs. Students will work in small groups to design an experiment with one independent variable and test this variable on spinach leaf disks. As light intensity increases, the rate of photosynthesis will increase as long as other factors are in adequate supply.
light is again a limiting factor and a higher rate can be reached before the rate again plateaus. increasing temperature will have the greatest effect on reaching a higher rate of photosynthesis. Finding out How might. - An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis Introduction Photosynthetic takes place in the chloroplasts of green plant cells; it can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen.
The students can be allocated to investigate a particular factor that affects the rate of photosynthesis, or they can choose from this list, or they can develop their own ideas. Light intensity or distance of the Elodea from the lamp.An experiment on finding the factor that can increase the rate of photosynthesis