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What Are Photosynthesis and Respiration?

is the chemical change which happens in the leaves of green plants. It is the first step towards making food - not just for plants but ultimately every animal on the planet.

Photosynthesis consists of light-dependent and light-independent reactions.

A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.

The site that teaches the basics of chemistry to everyone

Nitrogen (as N2) accounts for 78% of air on a molar basis. presents a summary of major processes involved in the cycling of nitrogen between surface reservoirs. Nitrogen is an essential component of the biosphere (think of the amino acids) and the atmosphere is an obvious source for this nitrogen. Conversion of the highly stable N2 molecule to biologically available nitrogen, a process called fixation, is difficult. It is achieved in ecosystems by specialized symbiotic bacteria which can reduce atmospheric N2 to ammonia (NH3). The NH3 is assimilated as organic nitrogen by the bacteria or by their host plants, which may in turn be consumed by animals. Eventually these organisms excrete the nitrogen or die; the organic nitrogen is eaten by bacteria and mineralized to ammonium (NH4+), which may then be assimilated by other organisms.


Ask students to reflect on the results of the microcosm set-up and data analysis as they prepare for the presentation. They should compare their results with the equations for photosynthesis and respiration and consider the relationships among data.

Explain Photosynthesis | Sciencing

As we can see, there is a close relationship between the action spectrum and absorption spectrum of photosynthesis. There are many different types of photosynthetic pigments which will absorb light best at different wavelengths. However the most abundant photosynthetic pigment in plants is chlorophyll and therefore the rate of photosynthesis will be the greatest at wavelengths of light best absorbed by chlorophyll (400nm-525nm corresponding to violet-blue light). Very little light is absorbed by chlorophyll at wavelengths of light between 525nm and 625 (green-yellow light) so the rate of photosynthesis will be the least within this range. However, there are other pigments that are able to absorb green-yellow light such as carotene. Even though these are present in small amounts they allow a low rate of photosynthesis to occur at wavelengths of light that chlorophyll cannot absorb.

Bacteria may also use NH4+ as a source of energy by oxidizing it to nitrite (NO2-) and on to nitrate (NO3-). This process is called nitrification and requires the presence of oxygen (aerobic conditions). Nitrate is highly mobile in soil and is readily assimilated by plant and bacteria, providing another route for formation of organic nitrogen. Under conditions when O2 is depleted in water or soil (anaerobic conditions), bacteria may use NO3- as an alternate oxidant to convert organic carbon to CO2. This process, called denitrification, converts NO3- to N2 and thus returns nitrogen from the biosphere to the atmosphere.

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Chemistry of Photosynthesis - Videos & Lessons | …


Students will need to write a procedural plan for using WOW data to demonstrate that photosynthesis and respiration occur in a lake. The plan should be detailed enough for others to follow.

The Chemical Equation of Photosynthesis


Discuss lab results with students. How might photosynthesis and aquatic respiration affect water chemistry in a lake environment? Consider how photosynthesis and respiration might affect oxygen concentrations, temperature, and pH in a lake.

What Are Photosynthesis and Respiration? - dummies

Citation: "Direct evidence of quantum transport in photosynthetic light-harvesting complexes." By Gitt Panitchayangkoon, Dmitri V. Voronine, Darius Abramavicius, Justin R. Caram, Nicholas Lewis, Shaul Mukamel, and Gregory S. Engel. Proceedings of the National Academy of Sciences, Vol. 108 No. 49, Dec. 6, 2011.

What Are Photosynthesis and Respiration?

The action spectrum of photosynthesis is a graph showing the rate of photosynthesis for each wavelength of light. The rate of photosynthesis will not be the same for every wavelength of light. The rate of photosynthesis is the least with green-yellow light (525 nm-625 nm). Red-orange light (625nm-700nm) shows a good rate of photosynthesis however the best rate of photosynthesis is seen with violet-blue light (400nm-525nm).

What is the equation of photosynthesis

The figure illustrates how closely photosynthesis and respiration are linked. As you can see, thanks to these two life-sustaining processes, plants and animals depend on each other to survive.

Teaching about the Effect of Photosynthesis and Respiration on ..

The light-independant reactions of photosynthesis occur in the stroma of the chloroplast and involve the conversion of carbon dioxide and other compounds into glucose. The light-independent reactions can be split into three stages, these are carbon fixation, the reduction reactions and finally the regeneration of ribulose bisphosphate. Collectively these stages are known as the Calvin Cycle.

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