Investigating photosynthesis using immobilised algae Class practical This procedure offers a method for measuring the rate of photosynthesis which depends directly on the rate of uptake of carbon dioxide by the photosynthetic organism. Hydrogencarbonate indicator changes colour with pH, which is determined by the concentration of carbon dioxide in solution. The photosynthetic organism is a fast-growing green alga — such as Scenedesmus quadricauda — immobilised in alginate beads. These algal balls make it easy to standardise the amount of photosynthetic tissue in any investigation.
My possible photosynthesis shows a rapid increase then when at around about 2. The conclusions are that the rate of photosynthesis will not keep on rising and it will stop rising at a certain point.
On our graph it was 2. My prediction was right as it says the graph will rise to a certain point were it will, after that, start to fall.
They noticed the plant dead after 48 hours. It may be because the sodium hydrogen carbonate is an alkali and it is used in baking soda, pharmaceutical products like indigestion tablets and fire extinguishers so that may have killed the plant. If you increase the concentration of sodium hydrogen carbonate it will make the pH of the plant rise.
The effect this will have on the plants enzymes is that they will be killed because they will work more rapidly killing themselves more quickly. To get round this problem we should of used a percentage of 2. The method could be improved by doing the results again on own instead of relying on other people to take results.
I could do further work in order to give more evidence for my conclusions by doing more research in the books and asking the teacher more.Aug 18, · Please explain how sodium carbonate affects the rate of photosynthesis.
If possible, please help me design an experiment to test this given the the following materials: pfmlures.com leaves of plants 2.a bottle of 5mol concentration of sodium hydrogencarbonate solution 3. stop watch pfmlures.comc straw pfmlures.com borer 6. torch light as light source 7. dark cloth 8.
large syringe 9.
6 x mL measuring Status: Resolved. Graph 7. Rate of photosynthesis versus CO 2 /NaHCO 3 concentrations at light intensities (2 factors) Initially the graph lines are linear as the rate of photosynthesis is proportional to the carbon dioxide (or sodium hydrogencarbonate) concentration (see also Graph 3).
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. Carbon dioxide is needed for photosynthesis, so as the carbon dioxide concentration increases, the rate of photosynthesis chemical reactions steadily increases in a linear manner - initially the reaction rate of photosynthesis is directly proportional to CO 2 concentration (can be in air or water).
hydrogen carbonate on the rate of photosynthesis. Plan: concentration of sodium hydrogen carbonate to make sure that the I have decided to investigate how the concentration of sodium hydrogen carbonate affects photosynthesis because other factors such as temperature and wavelength are hard to.
If the concentration of sodium bicarbonate is decreased, then the leaf chads will rise at a slower rate because there will not be as much carbon dioxide for the leaves to use for photosynthesis.
This hypothesis is not entirely supported by the data.