As the .Factors Affecting The Rate Of Photosynthesis Biology Essay.
changing other factors will not increase the rate of photosynthesis.
Lets take light intensity as an example:
In complete darkness, it is the absence of light alone that is stopping photosynthesis taking place.
Investigation into the Factors Affecting The Rate Of Photosynthesis.
Light is the limiting factor
If we increase light, the rate of photosynthesis will rise, although not indefinitely.
At some point, increasing light intensity will have no effect -
there is a new limiting factor
Processes such as photosynthesis are made up of a series of smaller reactions.
Predicting photosynthesis: Students draw out predicted graphs for light intensity, CO2 level and temperature during a typical day in a named month of the growing season. Explain the shapes of these graphs, bearing in mind effects of respiration. Contrast with an early spring or late autumn day. This will lead on to the topic of and is suitable for students of higher level
Presentation: Create a presentation on how to grow a plant in the best possible conditions. Students must make a reference to each limiting factor as well as any additional knowledge that they might have. Presentations may talk about fertilisers, which relates to the topic . Suitable for students of all levels
Activity: Students try and design a way to grow crops for a manned moon-base. They will essentially create a greenhouse which can provide a suitable amount of each limiting factor required for photosynthesis. Students may even add additional features to their "space farm". Suitable for students of lower level and SEN
how does temperature affect the rate of photosynthesis?
Students can be asked to interpret graphs showing photosynthesis where two limiting factors are kept constant and one limiting factor is slowly increased. Students must know why the rate of photosynthesis decreases or increases on the graph.
how do you draw the data graphs for photosynthesis results?
Variables: The variables that might affect the rate of photosynthesis in this experiment are: Temperature: When the temperature rises so does the rate of photosynthesis; this is because as the temperature around the plant rises the enzymes controlling photosynthesis inside the chloroplasts heat up and start moving around faster, the fast moving molecules collide with other fast moving enzymes causing them to react....
BBC - GCSE Bitesize: Factors limiting photosynthesis
Farmers using greenhouses often enrich the air to incrase crop yields.
Effect of temperature
Provided other factors are not limiting, photosynthesis rate increases in direct proportion with temperature.
Photosynthesis limiting factors ppt - TES Resources
In most plants 25 C is the optimum, after which the rate rapidly declines.
Photochemical reactions are not affected by temperature, so the fact that photosynthesis is suggested to scientists that there must be an entirely chemical process involved as well - we now know this is the light-independent reaction.
A good ppt about limiting factors on photosynthesis
CO2 + H2O + Light --> Sugar + O2
Students should learn that light is the source of energy used by plants to synthesise sugars rather than as a molecule which is being incorporated to form sugars and oxygen.
Water not mentioned as a limiting factor: textbooks and GCSE syllabuses will often fail to mention water as a limiting factor in photosynthesis
Free rate of photosynthesis Essays and Papers - 123HelpMe
How have humans overcome limiting factors? This ties in heavily with "Food and the environment" and would serve as a good question to link the students' concepts of photosynthesis to large scale agriculture.