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Photosynthesis consumes CO2 and produces oxygen
Plants are , which means they are able to synthesize food directly from inorganic compounds, instead of eating other organisms or relying on material derived from them. Most notably, they use gas and water to produce sugars and gas. The energy for these processes comes from photosynthesis. For instance, the over-all equation for the production of is:
"The new knowledge will help improving present day synthetic catalysts for water oxidation, which are key components for building artificial leaf devices for the direct storage of solar energy in fuels like hydrogen, ethanol or methanol," says Johannes Messinger, Professor in Biological Chemistry and leader of the Artificial photosynthesis research group at Umeå University.
Photosynthesis Images Show Splitting of the Water …
Note that oxygen is only produced from the water, and not from the carbon dioxide that plants use. This was first proposed by C. B. van Neil in the 1930s, who studied photosynthetic bacteria. Aside from the , they use reducing agents such as or , so no oxygen is produced.
The ATP and NADPH produced by photosynthesis drive a variety of other biochemical processes. In plants, the most notable is the , by which carbon dioxide is converted into (and thence into other sugars, such as , which is then converted into and sometimes ). These are called , or dark reactions, since they can occur in the absence of light.
Photosynthesis Images Show Splitting of the Water ..
Plants capture light using the pigment , which gives them their . This is contained in (compartments within the ) called . Although all green parts of a plant have chloroplasts, most of the energy is produced in the . The cells in the interior tissues of a leaf, called the , contain about half a million chloroplasts for every square of leaf. The surface of the leaf is uniformly coated with a water-resistant, , that, protects the leaf from excessive absorption of light and evaporation of water. The transparent, colourless layer allows light to pass through to the mesophyll cells where most of the photosynthesis takes place.
Algae range from multicellular forms like to , single-celled organisms. Although they are not as complex as land plants, photosynthesis takes place in the same way. Light is absorbed by chlorophyll, although various accessory pigments give them a wide variety of colors, located inside chloroplasts. All algae produce oxygen, and many are autotrophic. However, some are , relying on materials produced by other organisms.
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Oxygen is a chemical element with symbol O and atomic number 8
Photosynthesis produces more energy for certain wavelengths of light. In plants, there are two involved, which are most active at 700 and 680 . However, other wavelengths are also peaks in the action spectrum for photosynthesis.
X-ray Blast Produces a 'Molecular Black Hole' - D-brief
Photosynthetic bacteria do not have chloroplasts. Instead, photosynthesis takes place directly within the cell. The contain chlorophyll and oxygen, in the same way that chloroplasts do - in fact chloroplasts are now considered to have developed from them. The other photosynthetic bacteria have a variety of different pigments, called , and do not produce oxygen.
SparkNotes: SAT Subject Test: Biology: Cell Respiration
The NADPH is the main in cells, providing a source of energetic electrons to other reactions. This leaves chlorophyll with a deficit of electrons, which must be obtained from some other reducing agent. In plants and algae this role is played by water, resulting in the production of oxygen:
What Are Photosynthesis and Respiration? - dummies
Every child learns at school that the oxygen we breathe is produced by photosynthesis in plants and by cyanobacteria that live in lakes and the oceans. However, exactly how that happens is still under intense research.
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In , , a French pastor, showed that CO2 was the "fixed" or "injured" air and that it was taken up by plants in photosynthesis. Soon afterwards, showed that the increase in mass of the plant as it grows could not be due only to uptake of CO2, but also to the incorporation of water. Thus the basic reaction by which photosynthesis is used to produce food (such as glucose) was outlined.
Plant Energy Transformations-Photosynthesis - …
A first experiment to prove that the oxygen developed during the photosynthesis of green plants came from water, was performed by in and . He showed that isolated give off oxygen in the presence of unnatural reducing agents like iron oxalate , ferricyanide or after exposure to light. The Hill reaction is as follows
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