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Experiments to show factors required by Photosynthesis

For this reason we want to do a research on factors affecting photosynthesis.

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275 Words


The Effect of Algae on the pH | Healthfully

Photosynthesis is a complex reaction and can be
summed up in an equation:

carbon dioxide + water light and chlorophyll glucose + oxygen

[IMAGE] 6 CO 6 H O C H O 6 O




* Light: This factor is just as important as the others are in
Photosynthesis, without it photosynthesis would simply not take place.

In practice, any one of these factors could limit the rate of photosynthesis.

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 factor I will be investigating is light intensity; how it affects the rate of photosynthesis.

6CO + 6H O ® C H O + 12O (in the presence of light energy and chlorophyll) Aim- The aim of the experiment is to determine what effect light intensity has upon the rate of photosynthesis of Canadian Pondweed (Elodea)....

Light is a very important factor in the rate of photosynthesis, in my project I am going to test that plants do need light in order to photosynthesise.

Physiological factors that affect photosynthetic rates

Photosynthesis should not occur if one of the limiting factors is not present.

Constable, G.A. and H.M. Ranson. 1980. Effect of leafposition, expansion and age on photosynthesis, transpiration and water use ofcotton. Austral. J. Plant Physiol. 7: 89-100.

Wunsche, J.N. and W.P. John. 2000. Effects of crop load onfruiting and gas-exchange characteristics of `Braeburn'/M.26 apple trees atfull canopy. J. Amer. Soc. Hort. Sci. 125: 93-99.

Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis.
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  • What are factors that affect photosynthesis? | Yahoo …

    In the second project you will research the effect of different parts of the light spectrum in photosynthesis.

  • Factors affecting the rate of photosynthesis 1

    Theory: Sunlight is an essential factor need to complete the process of photosynthesis.

  • 15 Main Factors Affecting Photosynthesis - Biology …

    * Temperature: Photosynthesis can occur without this factor but it would be a very slow process.

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External Factors Affecting Photosynthesis - …

Asian pear ( Rehd. cv. rehd.) is one of the most prevalent tree crops in southern China. Thesubtropical climate of this region provides for cloudy, rainy conditions withlow temperatures in the spring, when pears produce new shoots, expand leaves,flower and set fruit, increasing the demand for organic and inorganicnutrients. Plants meet these nutritional requirements three ways: (1) nutrientstorage, (2) uptake of inorganic nutrients from the soil through the rootsystem, and (3) synthesis of carbohydrate through leaves. Under unfavorableconditions, leaves have a stronger photosynthetic capacity to supplysufficient carbohydrates and organic nutrients to assure pears can finishvarious biochemical and physiological processes. Hancock and Flore (1989)reported the regression coefficient of net photosynthetic rates wassignificantly correlated with yield. Determining the leaf photosyntheticcharacteristics of pear is therefore important to maintaining yield andimproving fruit quality.

External Factors Affecting Photosynthesis

concentration, and soil water deficit affect stomatalresponse, gas exchange and photosynthesis (Mooney and Harrison, 1970; Berryand Bjorkman, 1980; Lieth and Pasian, 1990; Xie et al., 1996; Moriana et al.,2002). Based on changes during the day or between days, Heinicke and Childers(1937) concluded that light was the major factor affecting whole-canopy NCERof apple trees, and temperature was second most important, although Sirois andCooper (1964) concluded CO2 was second. A recent study(Corelli-Grappadelli and Magnanini, 1993) reported short-term whole-canopyNCER measurements declined with gradually declining light levels for one appletree. Photosynthesis and transpiration were greatly influenced by stomatalbehavior. Stomatal opening is affected by CO2 concentration, vaporpressure gradient (VPG), light, turgor pressure caused by change in potassiumand organic acids, and by abscisic acid (ABA) (Raschke, 1970; Schulze andHall, 1982). Berry and Bjorkman (1980) found light intensity, CO2concentration, temperature, and soil water deficit may have affected gasexchange of plants in a greenhouse. Bunce (1984) reported photosynthesisincreased when humidity was increased in the environment. Transpiration atnoon under a high temperature after 48 h of acclimation was 400% higher thanunder a moderate temperature. Stomatal resistance reached a minimum at noon,in accordance with the transpiration rate. Leaf wa

BBC - GCSE Bitesize: Factors affecting photosynthesis

Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis.

Factors that Affect Photosynthesis - Process of Photosynthesis

To improve my work I could have repeated the experiment
another 4 or 5 times to solidly confirm my conclusion and I could have
do my experiments in a close area, where the temperature and carbon
dioxide were 100% constant and therefore would not affect my results
the slightest bit.

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