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Light Intensity and Rate of Photosynthesis (Carol Cao) ..

Aim: We will be trying to see if light intensity has an effect on the rate of photosynthsis.

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275 Words


rate of photosynthesis lab results

And as both methods (finding starch/ measuring
oxygen given off by the plant) show that photosynthesis is taking
place, I chose to measure the rate of oxygen produced.

The rate of photosynthesis was recorded at a range of light Intensities and conditions.
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(The taking place within
the plant will increase)

For example, in terms of when a plant completes the process naturally
(without human interference) it is scientifically known that the
process is greatest at mid-day, when the sun is highest, and from
after this point, when the sun gets lower and less light is available
to the plant, the rate of the process decreases, until nightfall where
no such process takes place.

The rate of photosynthesis can be affected by ..

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.
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Input - Light intensityis to be varied by increasing and decreasing
the distance from the light source to the plant

Output - The rate of photosynthesisis to be measured by counting the
bubbles of oxygen produced by the plant every two minutes, and
therefore finding the rate of photosynthesis

Control - The amount of water available to the Elodea will stay the
same level in the 400 cm3 beaker.

The colour of the lamp will stay the
same (yellow) as to plants Chlorophyll easily absorbs blue light,
however it does not easily absorb green or yellow light, rather it
reflects it, this decrease's the rate of photosynthesis.

#41 Effect of Light intensity on the rate of Photosynthesis

Aim: To see if raising the light intensity increases the rate of photosynthesis.
Photo provided by Flickr

Similarly, I had no idea at what
distance the plant would cease to photosynthesise, as the lamp was the
only source of intense light available.

The lab in which the
experiment took place was not very well supplied with light, if the
lamp was not present, it would not be wrong to say that photosynthesis
would have ceased to take place within the lab at all.

Prediction:I predict that raising the light intensity will increase the rate of photosynthesis.
Photo provided by Flickr
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  • Does light intensity affect the rate of photosynthesis

    The rate of photosynthesis was measured at 4 other light intensities of 80, 350, 150, 60 and 0-μmol photons m-2 s-1.

  • Investigating the effect of light intensity on the rate of ..

    In this experiment I will investigate how sodium hydrogen carbonate affects the rate of photosynthesis.

  • effect of light intensity on the rate of photosynthesis

    I then think that the rate of photosynthesis will stay the same when it reaches a certain point.

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of light would affect the rate of photosynthesis ..

Figure 20. The rate of photosynthesis (and energy dissipation routes) when a "UV" LED is used as the light source. These rates have been corrected for photosynthetic radiation not sensed by quantum meters.

How light intensity effects the rate of photosynthesis ..

Figure 19. Take home message: The green line shows that photosynthesis occurs when the coral's Zooxanthellae is illuminated with black light. This figure shows the of energy dissipation pathways when a black light is used as the light source. Since a PAR meter does not 'see' the maximum output of the lamp at 365nm, no ETRs can be calculated. Note that PPFD detected by the Li-Cor PAR meter during this procedure was less than 1 µmol·m²·sec.

Rate of Photosynthesis in Pond-Weed :: Papers

The following charts demonstrate the rate of photosynthesis - the relative electron transport rate (rETR) - in a coral when illuminated by various LED light sources described above. Other energy dissipation pathways (NPQ and NO) are shown as well. See the Glossary (above) for definitions and the Methods and Materials (below) for further information. See Figures 19 - 24.

Rate of Photosynthesis in Pond-Weed ..

Results of testing show there are clear differences in the rate of photosynthesis when light sources of different hue (or color) are used. See Figure 25.

Factors affecting the rate of Photosynthesis; ..

Black light, or UV-A radiation, produced by a fluorescent lamp was used to determine if zooxanthellae can utilize these wavelengths in photosynthesis. About 28% of this lamp's output is in the range visible to the average human eye, according to analysis with a spectrometer. See Figures 5 through 7, & Table 3.

and at a certain light intensity the rate of photosynthesis stay ..

I could then see that if the process would not give sufficient
results with the lamp at a distance from the pond weed at 50cm, then
process of photosynthesis would definitely cease to take place with
the light source at a distance of 100cm from the pond weed.

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