Introduction: Photosynthesis is carbohydrate production using light and chlorophyll. It is a process when green plants and other organisms turn carbon dioxide and water into carbohydrates and oxygen, using light energy trapped by chlorophyll. The rate of photosynthesis can be measured by either the disappearance of substrate or the accumulation of product. 2H2O + CO2 + light -> carbohydrate (CH2O) + O2 + H2O
There is a spongy mesophyll layer in leaves, or disks of leaves. It is normally infused with gases, making the leaves normally float in water. If the leaf is put in a solution with an alternate source of carbon dioxide, then photosynthesis can occur in sunken leaves. Nevertheless, there are variables that can affect the rate of photosynthesis when doing so. Hypothesis: If two different color pieces of cellophane is placed on the top of a cup of sunken disks of spinach leaves, then the rate of photosynthesis will be faster in the cup covered with green cellophane. Materials:
* Baking soda (sodium bicarbonate)
* Liquid soap
* 2 Plastic syringes
* Living leaves
* Hole punch
* 2 clear plastic cups
* Timer
* Light
Experiment: First, bicarbonate solution was prepared and poured into two clear plastic cups to a depth of about 3 cm. Then, one drop of liquid soap was dropped into the solution in each cup. Using a hole punch, 10 spinach leaf disks were cut out for each cup. Each set of leaves were placed into two separate syringes. The plunger was replaced into the syringes and pushed in until only a small volume and air and leaf disked remained in the barrel (without damaging the leaf disks).
The Essay on Leaf and Photosynthesis
Abstract The purpose of this experiment was to determine the rate of photosynthesis in different concentrations of a Bicarbonate solution. My Hypothesis was that if you placed the spinach disks in the highest concentration of bicarbonate then that is where photosynthesis would happen the fastest. We cut out equal disk from a plant leaf and placed half in water and the other half a bicarbonate ...
Then, a small volume of the sodium bicarbonate plus soap water was pulled into the syringe. The plunger was then pulled even farther back, with one finger on the opening of the syringe, creating a vacuum. It was held for about 10 seconds and then released. This was done until all the air space in the leaf disks were filled with the solution, causing it to sink. After that the disks and the solution in the syringe was poured out into the two separate cups. Added to the top of those cups was a purple and green piece of cellophane. These cups were set under a light source and then timed for the rate of photosynthesis occurring.
The rate of photosynthesis was the fastest in the spinach leaf disks that were in the cup covered in green cellophane, by about two minutes. Therefore, the hypothesis was proved to be correct. Error analysis: There were two main parts to this experiment that could have been changed to get more accurate results. One was the amount of time given to test the experiment, and the other was the amount of trials done- it should have been tested more than one time. Conclusion: This lab helped increase the understanding of the rate of photosynthesis in plants. It strongly demonstrated how different frequencies of light have different electrons which excite particles at different levels, leading to a different rate of photosynthesis when a variable is added to it. The only thing that could have made the experiment more clear would be less experimental errors such as, not enough time given to do the experiment and testing is numerous times to get the most accuracy.
The Essay on Video Games Experiment Pulse Rate
The purpose of this experiment is to find out if video games affect your pulse rate. I predict that the more intense the game is, the higher the pulse rate will be. I believe this because in an intense game, you can get real nervous which would cause you to push the buttons very fast. Sony Playstation Sony Playstation Controller Cool Boarders 3 game Crash Bandicoot 2 game Gran Turismo game Final ...
