Investigating the rate of photosynthesis by
Fastest rate of photosynthesis
Transpiration is the loss of water vapour from the surfaces of a plant. Another source of inaccuracy is the presence of other light sources, of which intensities may be varied by shifting shadows. Keep the temperature and CO2 level constant. This will allow bubbles to escape freely. Students should collect and set up all the other apparatus before collecting the boiling tube of pond weed. As the plant produces oxygen, the bubbles with move up the funnel into the pipette and displace the water. The beaker of water acts as a heat filter or heat shield, so its temperature should be checked at intervals to ensure that it is constant throughout the experiment; the water should be renewed if necessary.
LED lamps produce less heat. They do this by a process called Photosynthesis.
The experiment investigated the different CO2 intake by the Pittosporum due to how much sunlight they are able to obtain. If there is a shortage of CO2… 5. Very high light intensities may slow the rate of photosynthesis due to bleaching of chlorophyll.
Measuring the rate of photosynthesis Measuring the rate of photosynthesis Without photosynthesis life as we know it would not exist. Add sodium hydrogencarbonate to the water which introduces carbon dioxide to the water to speed up the rate, and fill the large beaker with this water.
Measuring the rate of photosynthesis elodea lab report
GCSE Qs: 1. Sometimes cutting 2—3 mm off the end of the Elodea will induce bubbling from the cut end or change the size of the bubbles being produced. 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. Use an aquatic plant such as elodea, but plants such as hottonia palustris also work well. Light is not normally a limiting factor except for plants in forest understory of other shaded plants. The two layers of glass provides protection from the heat of the lamp, and the water level moves down rapidly as the gas is collected, making it possible to gather results in well under an hour. It does, though tend to break apart very easily, and fish may eat it very quickly. Light intensity directly affects the light-dependent reaction in photosynthesis and indirectly affects the light-independent reaction. Plants are the primary producers. What happens to the rate of photosynthesis when the light intensity starts to increase? Control the temperature and light intensity.
If the rate of bubbling is very high, then there may be errors in counting. Detergent may be added to reduce surface tension. This chemical is a very important part of Photosynthesis, as this is where the plant, to produce its own food, absorbs sunlight.
Rate of photosynthesis limiting factors rsc
Their tertiary structure breaks down, changing the shape of the active site so that reactant molecules no longer fit. This can be measured with a lightmeter as the lamp is moved closer. If oxygen is present the splint is re-ignited into a flame. The students could develop this practical as an assessed investigation if they develop hypotheses and plan the experimental detail from the core protocol. Another assumption is that all the bubbles are the same size. GCSE Qs: 1. Light is a limiting factor when the light intensity is too low to allow the light-dependent reaction to proceed at its maximum rate. Investigating the light-dependent reaction in photosynthesis The rate of decolourisation of DCPIP in the Hill Reaction is a measure of the rate of the light-requiring stages of photosynthesis.
Attach the gas-collecting apparatus, if any. This could give a comparison between several plants.
Experiment to test the rate of photosynthesis
Alternatively, you could place some Bicarbonate Indicator Solution in the bag with the plant and watch the colour change. The law of limiting factors states that: At any given moment, the rate of a physiological process is limited by the factor that is at its least favourable value. There is a total of x tonnes of carbon dioxide in the atmosphere and photosynthesis fixes x tonnes per year. Beyond the optimum temperature however, enzymes begin to be denatured. Students should collect and set up all the other apparatus before collecting the boiling tube of pond weed. Cabomba may be used in some countries, but it is restricted in the UK, due to it being an invasive species and a risk to local plant populations if it is released into the environment. However, at sufficiently high levels of light intensity, the rate oxygen evolution remains constant. This factor is called a limiting factor because it limits the rate at which the process can take place.
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