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Experiment to show that carbon dioxide is needed for photosynthesis.
1. Photosynthesis is the most important chemical process in the world. Without it, plants and people could not exist.
2. A plant’s leaves are vital for its survival. Most of the photosynthesis process takes place in the leaves of a plant.
While this experiment found that rate of photosynthesis could be influenced by the concentration of bicarbonate ions, there is evidence that such is not the case with all corals' zooxanthellae.
How Photosynthesis Works - Science for Kids
Drosophila, best known as vinegar fly or fruit fly, is the little fly you see flyingaround vinegar and on fruit during the fall. Why raise vinegar flies? To observe theirdevelopment, to observe the chromosomes of their salivary glands during division, toperform experiments on genetics, finally as food for amphibians that have just completedtheir metamorphosis. In this case it is necessary to breed a species that can't fly. Youcan obtain individuals with vestigial wings (wings which are not fully developed)at a university Biology or natural sciences department.
Culture medium recipe for drosophila: water 83 ml, agar-agar 0.8 g, sugar 5 g, brewer'syeast 10 g, alcohol 1.3 ml, nipagin
0.25 g. Nipagin M is used as a preservative in foods and cosmetics, like agar-agar, youcan buy it at the stores that sell science items for laboratories. Mix the yeast and thesugar, add agar-agar and water and simmer for 3 minutes. Turn off the heat. Dissolve thenipagin in alcohol and add to the rest when it has stopped smoking. Mix and let it set.
You can find other recipes at the following websites:
Aquick and simple introduction to Drosophila melanogaster
Fruit Flies - Drosophila melanogaster
Drosophila Culture (how to culture flightless fruit flies)
Observing the Development of Drosophila in Apple Juice Agar
Drosophila Genetics Lab I
A bibliography for an insect field biology course
La drosophile (in French)
Internet keywords: drosophila culture -cells, wingless fruit flies vinegar fly.
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.
Photosynthesis - definition of photosynthesis by The …
Effect of different colors of light on the rate of photosynthesisThe effect of different lights on plant growth: incandescent light, fluorescent light, sunlight and black light.
hotosynthesis is the link between inorganic and organic worlds, and the importance of contributions made by zooxanthellae in maintaining health of photosynthetic corals is well known. We also know that rates of photosynthesis are dependent upon the amount of light, its spectral quality, as well as a supply of nutrients (for terrestrial plants, 'nutrient' is generally defined as nitrogen, potassium and phosphorus with 'micronutrients' described as iron, copper, and a host of others.) Though not listed as such, inorganic carbon (in the form of carbon dioxide) is an important nutrient in that it is necessary for plant growth and production of simple sugar. In marine aquaria, nutrients such as nitrogen and phosphorus are usually in such supply that means of removing them are often necessary. Potassium, with a concentration of about 400 mg/L, is also in good supply, and micronutrients might be added or replenished through feeding or water changes. But what of carbon? While it is true that some carbon dioxide may be present in an aquarium, and corals' respired CO2 can meet some of photosynthesis' carbon demand, some of the carbon used by at least some zooxanthellae will be provided by bicarbonate dissolved in the aquarium water.
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sunlight is absorbed by chlorophyll in a leaf B
When a plant combines water, carbon dioxide and sun-energy to make the glucose there is always something left over. It is called oxygen—the very same oxygen we need to breathe. Because the plants don’t need it, they get rid of it. When a plant gets rid of the oxygen they don’t need, it is called respiration. A plant gets rid of oxygen through its leaves, stems and flowers, fruits or vegetables. And when they do, we have the oxygen we need. Thanks, plants~Photosynthesis facts
carbon dioxide is taken in from the air C
Follow in the steps of van Helmont, John Woodward, Joseph Priestley and Jan Ingenhousz and discover photosynthesisIs plant growth affected by exposure to ultraviolet light?
water is transported from the roots D
In this experiment Ingenhousz demonstrated that plants are dependent on light and their green parts for nutrients and energy.
For more photosynthesis experiments look here:
Pearson - The Biology Place - Prentice Hall Bridge page
Immediatelyafter exposure to 14CO2, the plant's photosynthetic tissue iskilled by immersing it in boiling alcohol, and all of the biochemical reactions cease.
LabBench Activity Plant Pigments and Photosynthesis
The Effects of pH Levels and Phosphorous on the Photosynthesis Process of Aquatic PlantsStudy the coniferous spruce tree (Picea glauca as the species of choice) by measuring its lateral and sub-lateral branch angles in order to see how it collects sunlight from various angles on its south-facing side.
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