Oxygen is measured in the number of bubbles produced by the plant. All the food we eat and all the fossil fuel we use is a product of photosynthesis, which is the process that converts energy in sunlight to chemical forms of energy that can be used by biological systems. Scroll down and click on the link to Photosynthesis. Light intensity will also affect the rate as well as temperature. As noted before, photosynthesis requires carbon dioxide and water.
The light intensity is measured by the distance between the lamp and pondweed. Its rate will only increase when its supply is increased. Using the interactive activity and complete this Pondweed Practical. It gives green color and absorbs the necessary light for photosynthesis. Light and rate of photosynthesis At low light intensities, as light intensity increases, the rate of the light-dependent reaction, and therefore photosynthesis generally, increases proportionately straight line relationship. Hypothesis I think that as the light intensity gets stronger, the amount of bubbles let off by the plant will increase.
Evaluation: Considering the reliability, I think that I have done enough repeats, I repeated my tests three times which is the average amounts of time to repeat it for a fair test. The distance from the bulb to the pondweed. Egeria densa formerly Elodea densa. This is because photosynthesis is a. Download the resources from the link on the right.
The leaf disks started floating after being exposed to white light because the process of photosynthesis is light- dependent. Conclusion The following conclusive results would be made out of this experiment. Google the web site www. Materials: 3 Leaves Hole punch Lamp Diluted soap one drop x2 1 X 1 metre Aluminium foil x2 1 X 1 metre Glad wrap x2 300mL water x2 1g of sodium bicarbonate x2 Plastic syringe 10cc or larger Stopwatch Small beaker x2 Variables: Dependent. Which one of the following is most likely to happen? There are various limiting factors that affect the rate of photosynthesis. You might get a question literally asking for what appartus you used in the exam: it varies.
This lab demonstrates how plants store light, capture light, and use light as energy for reproduction and growth, by photosynthesis. However, we would not recommend growing this in school ponds, as it is an invasive species that can cause harm to invertebrates and fish. Prediction I predict that as the light intensity increases that the rate of photosynthesis will increase in proportion, so for example if you increase the light intensity from 10cm away to 20 cm away form a stationary plant. If a light source is placed near the pondweed plant that acts as sunlight, then the plant will release more oxygen due to splitting of water molecule into hydrogen and Oxygen molecule. Without light, the plant will stop the photosynthesising process, because, light is a limited factor.
It is hypothesized that altering the amount of light received by duckweed will alter its photosynthetic rate. The empty electron orbital formed is filled with an electron from a water molecule P. The cuvettes were tested individually at different wavelengths and intensities to find the optimal rate of photosynthesis. In a bicarbonate solution, both carbon and water is present. In photosynthesis the rate is affected by three factors, temperature, carbon dioxide concentration and light. · Repeat this 3 more times so you get 3 sets of results.
The process takes place in two phases: the light dependent reaction and the light independent reaction. I will measure the rate of photosynthesis by counting the number of bubbles that are released by the stem of the pond-weed when the lamp is shone on it from different distances. Rate of photosynthesis: limiting factors Limiting factors The main factors affecting rate of photosynthesis are light intensity, carbon dioxide concentration and temperature. They do this by a process called Photosynthesis. From this, the risk assessment is quite low but it should not be ignored.
Each beaker would be labeled. Photosynthesis is carried out by many different organisms but usually by plants and algae. What does the lamp represent? It does, though tend to break apart very easily, and fish may eat it very quickly. Light is required for the process of photosynthesis to begin and so the disks would not start floating unless they were placed under the sun, or in this instance the white light. Investigating the rate of photosynthesis This is an example of a common experiment used to investigate light intensity and the rate of photosynthesis.