Measuring the Rate of Photosynthesis
Plan
I am going to investigate the factors that affect the rate of
photosynthesis, these factors are:
* CO2
* Colour of the light
* Temperature
* Distance from the lamp to the pondweed
* Size of the pondweed
* Type of pondweed
We could measure and observe the way these factors affect the pondweed
by looking at:
* The amount of air bubbles formed per minute
* The distance from the lamp to the pondweed
* The amount of pondweed
* The temperature of the water
* How much water is lost
* The condition of the pondweed
I am going to change the different colours of the light by using
different pieces of coloured plastic and by doing this I will be
observing the amount of air bubbles formed per minute.
Apparatus
=========
* Lamp
* Beaker
* Pondweed
* Thermometer
* Funnel
* Test tube
* Coloured filters
* Stop clock
Fair test
=========
To make this experiment a fair test I am going to keep the following
things the same:
* The type of pondweed
* The amount of pondweed
* The distance from the lamp to the pondweed
* The amount of water
* The amount of CO2
* The voltage of the lamp
* The amount of time used for each piece of coloured plastic
Prediction
==========
I predict that certain coloured lights will affect the amount of
bubbles per minute. This is because the pondweed only likes certain
coloured lights, they prefer colours that have longer wave lengths.
to get an idea of how I would do my real experiment and what apparatus
As the light is increased so would the rate of photosynthesis. Apparatus: boiling tube, 250ml beaker, bench lamp, ruler, sodium
I added ½ tablespoon of baking soda to 4 cups of water. I added a small drop of liquid soap to the water and stirred to mix. I used the end of a straw and cut out 20 circles of spinach leaves. I pulled the plunger completely out of the syringe and put the leaf circles into the syringe. Next I pushed the plunger back in. I used the syringe to suck up the baking soda water until the syringe was about ¼ full of liquid. I placed my finger over the end of the syringe and pulled back on the plunger as far as I could without pulling the plunger out. I repeated this step three times. All the leaf circles sunk to the bottom of the liquid. I placed the spinach into a clear glass with about 2 inches of baking soda solution. I blocked out all light. I set the lamp with a compact florescent light bulb. I placed the glass in front of the lamp. I counted the number of circles that floated after each minute for 20 minutes (positive control). I created a negative control by not placing compact florescent light bulb and not placing the glass in front of the lamp. I counted the number of circles that are floating. I repeated the experiment with fresh circles and used regular water plus soap for all steps instead of baking soda and soa...
The Effect of Light Intensity on the Rate of Oxygen Production in a Plant While Photosynthesis is Taking Place
An Analysis and Evaluation of Data from Photosynthesis Experiments Graph analysis This is my analysis for the investigation in to the affect of light intensity on the rate of photosynthesis to the Canadian pondweed, elodea. In the results the pattern is that when the light intensity is higher the readings are generally higher. On the graph the less the light intensity the lower the gradient of the curve. the equation for the photosynthesis process is; CO2 + 2H2O + Light Energy = =
The Effect of Wavelength on Photosynthesis Rate Aim: To be able to To investigate how different wavelengths (colors) of light affect the photosynthetic rate of the synthetic. I will use a pant that is a pond weed called elodea. I will measure the rate of photosynthesis by measuring the amount of o2 given off in bubbles per minute from the elodea. I will do this by placing the Elodea in a test tube with sodium hydrogen. carbonate then I will vary the light wavelength (color) using colored.
Planning Firstly here is a list of equipment I used. Boiling tubes Weighing scales Knife Paper towels 100% solution 0% solution (distilled water) measuring beakers potato chips Cork borer. We planned to start our experiment by doing some preliminary work. We planned to set up our experiment in the following way.
To make the test fair I will use the same amount of water and the leaf
the effect light has on the growth of pea plants. It will take place in an environment with controlled light, with equal amounts of plants being grown in the light and in the dark. All elements of the experiment other than light will be kept the same, such as amount of seeds in each pot, amount of soil in each pot and amount of water given to each plant each day. This will ensure a fair experiment. Prediction: I predict that in general, the plants grown in the light will grow better than those grown in the dark.
Two electrical wires * Stopwatch * Thermometer Method I put a piece of Elodea Canadensis (pond weed) in a test tube and covered it with water. The test tube was then placed in a beaker with a thermometer so that the water stayed the same temperature, this was then placed in a cardboard box with a bulb attached to a voltmeter by the electrical wires so that I could concentrate how much light the plant got. I varied the voltage (intensity) of the bulb and counted how many bubbles of oxygen were created at each voltage in one minute. I tested each voltage three times for accuracy for a minute each time. Results Preliminary Experiment Amount of bubbles Light intensity (lux)
Plan 1. Collect 4 different sized beakers 2. Boil some water in the kettle 3. Pour 50ml into each beaker 4. After 1 minute check temperature 5.
Measuring cylinder to measure small amounts of fluids. Pipette to gather small amounts of fluids. Test tube holder to hold test tubes. 2. Molar Salt solutions to submerge potato chips in.
* Count the number of bubbles seen in 1 minute which is a way of
Instead I will vary the light intensity the plant is provided with. I will do this by placing the light at different distances from the aquatic plant. I also thought about varying the wattage of the lamp I will be
however it does not easily absorb green or yellow light, rather it. reflects it, this decreases the rate of photosynthesis. This can