Photosynthesis takes place in all plants that contain chlorophyll.
To test this we used about 5 grams of leaves for each trial, and placed them in a gas chamber. On two sides of the gas chamber we placed two clear containers filled with water to serve as the temperature regulators. Behind the water containers we placed lights directed at the plant. We ran three trails for each different leaf we used. Each trail consisted of measuring the amount of CO2, with a CO2 gas sensor under blue light, red light, and green light. We made sure to switch the order of colors in each trail as an experimental control, to minimize error. Since we know that photosynthesis requires CO2, and we know that blue light pigments absorb the most light energy, we predicted that under blue light the most CO2 would be used.
Investigate constructions using origami (paper folding).
Until the end of the 17th century, people believed that little animals like flies andworms could spontaneously be born from substances in decomposition or from mud. FrancescoRedi, Lazzaro Spallanzani and Louis Pasteur made experiments which proved the idea of thespontaneous generation was wrong. At your home or in your school you can made suchexperiments too.
1 - Take two glass jars with a screw top. Put in each a little piece of cooked apple and aspoon of vinegar. For a night, leave one of these jars opened so it can be visited byvinegar (fruit) flies. Close the other jar with the lid and sterilize it by placing it inboiling water in a pressure cooker for a half an hour. After removing it from the cooker,let it cool, leaving it closed. The morning after, let the possible bugs present into thefirst jar leave and then close it with a fine gauze or a plastic sheet on which you willmake some pinholes to allow oxygen to enter. After a few days, you should see some bugs inthe first jar, and none in the second one. What has happened in the first jar which hasnot happened in the second? Some vinegar flies laid eggs in the first jar and from themsome new flies are born. In the second jar, even if there had been eggs, these are deadbecause of high temperature in the pressure cooker. More eggs were not laid because thejar was kept closed. With experiments like this one, you can realize that living beingscannot born from nothing, but they are born from other organisms like them. Fall is themore suited season to do this experiment because vinegar flies are particularly active.
2 - Anyway you can try to adapt this experiment to organisms present at other times of theyear. For example, if you place some dry grass in a water glass, in few days a deal ofprotists will appear. If instead you will put the same material in a close glass pot andif you boil it, nothing will be born. Only some rare thermoresistant microorganisms,bacteria which resist the high temperature of boiling water.
... Uhm, and still there is something which is not working: if any living being comes fromanother living being, from where has come the first living being from which all others arederived? Can we consider completely falsified the theory of the spontaneous generationwith these experiments? Is it possible to assert that, even if the spontaneous generationis not the usual way with which living creatures are born, at least at one time duringbillions of years it has happened on the Earth or another place in the Universe? It is noaccident that there are scientists who study how life began in the first place.
Internet keywords: spontaneous generation.
These Xenon HID lights seem to produce much in the lower chlorophyll A segment of PAR, but currently not as much in the higher infrared part of PAR.
Designing an experiment to test the rate of photosynthesis
Often LED as noted above are used as lunar or moonlights. This is an area where anecdotal information seems to be the main information available.
An Experiment to Investigate the Effect of Light …
, I should note to newer readers of this constantly evolving article that may think there is bias toward high end LED lights, you would only be 1/4 correct, as first I do not recommend the plethora of junk LEDs commonly sold and as well if you were to read this same article circa 2007, I did not recommend ANY LED Light, however technology had increased considerably in this arena of aquarium lighting.
[Effect of light quality on growth, photosynthesis …
I will look at the various factors affecting the reaction and select one variable to change, while the others keep constant in order to carry out a detailed investigation....
Photosynthesis | Experiment #7 from Biology with …
I will look at the various factors affecting the reaction and select one variable to change, while the others keep constant in order to carry out a deta...
Light Intensity and Rate of Photosynthesis (Carol …
Retrofit is also not all that difficult with most better LED systems sold with hardware that makes DIY mounting options quite varied.
TMC has an optional mounting system of rails and other parts that expands these mounting capabilities even further while the ZetLight & Maxspect come with a built in mounting system for aquarium rim mounting.