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Measurement of oxygen evolution is probably the easiest method.

To experimentally determine the effect of lightintensity on the rate of the light-dependent reactions of photosynthesis.

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The measurement of carbon fixation is a bit more difficult.

I could have measured the amount of oxygen given off by the
pond weed another way though, by measuring the volume of oxygen
present in test tube placed over the funnel covering the pond weed
(See diagram b.) I opted against this procedure though, due to
problems encountered in my preliminary investigation.

Both of these techniques measure NET photosynthetic rates.

The rate of carbon fixation through photosynthesis is a basic property of life on planet Earth. It is the basis for capturing and storing the energy that fuels our world’s living systems and forms the foundation of the food webs. The oxygen we breathe is a byproduct of this photosynthesis. According to its creators, these new net primary productivity maps provide a fascinating new insight into the intimate connection between the living world and the physical world.

In these cases the results of photosynthesis and growth are measured.

In this experiment we were told that we would be measuring the rate of photosynthesis.

In honor of the Earth Day celebration, NASA scientists unveiled the first consistent and continuous global measurements of Earth’s “metabolism.” Data from the Terra and Aqua satellites are helping scientists frequently update maps of the rate at which plant life on Earth is absorbing carbon out of the atmosphere.

Combining space-based measurements of a range of plant properties collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) with a suite of other satellite and surface-based measurements, NASA scientists produce composite maps of our world’s “net primary production” every 8 days. This new measurement is called net production because it indicates how much carbon dioxide is taken in by vegetation during photosynthesis minus how much is given off during respiration. Scientists expect this global measure of the biological productivity of plants to yield new insights into how the Earth’s carbon cycle works, a critical step toward solving the climate change puzzle.

They measure the mass of plant material.

The reduction of a dye called DPIP is a part of the measurement technique.

I think this because the plant may use up all of the carbon dioxide (Sodium hydro carbonate) and the plant can have as much light as it needs but if it does not have any carbon dioxide it will not be able to photosynthesise....

The chemical equation of photosynthesis is: [IMAGE]6CO2 + 6H20 C6 H12 O6 + 6O2 it has been proven many times that plants need light to be able to photosynthesize , so you can say that without light the plant would neither photosynthesize or survive....

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.
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  • This is a consequence of the inverse square law of light intensity.

    This means that the results will vary due to differences in the quality and quantity of light.

  • what factors affect the rate of photosynthesis?

    I am trying to find out if the distance of the pond-weed from a lamp will change the rate of photosynthesis.

  • how does light intensity affect the rate of photosynthesis?

    Hypothesis: The rate of photosynthesis in the water plant hydrilla will change as the rate of carbon dioxide changes.

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how does temperature affect the rate of photosynthesis?

You should see an upward curve/line present, if you are recording
light intensity on your graph, the reciprocal of the distance, other
wise stated as 1


This is perhaps the best choice of graph to construct, as it clearly
presents the idea that as the light intensity increases, so does the
rate at which oxygen is given off by the aquatic plant.

what apparatus can you use to measure the speed of photosynthesis?

See diagrams c
& d below…

Diagram c Diagram d

Results obtained from experiment : "Investigating if light intensity
effects the rate of photosynthesis in an aquatic plant."

As mentioned previously, the results I have obtained from the
experiment will be of measured in 5 intervals, ranging from 0cm
-100cm, 1 repeat reading taken as well as an original reading & an
average of the 2 results calculated.

An example of this would be the leaves of a plant.

Therefore in graph (c) the horizontal axis could be also labelled relative light intensity, a proportional linear relationship with the rate of photosynthesis.

Free rate of photosynthesis Essays and Papers - …

Likewise if a thermometer, which I will
be taking the temperature of the water with, is broken this must also
be reported immediately, as it contains poisonous mercury.

Free rate of photosynthesis papers, essays, and research papers.

This is why I
calculated the reciprocal of distance (1 ) In the table of average
results & not just distance as shown in the 2 tables prior to D

the results table.

Lab: Exploring the Rate of Photosynthesis - The Biology …

Prediction : I predict that as I increase the distance between the light source and the Canadian Pondweed (reducing the light intensity), the volume of oxygen produced within the time limit (the measure of the rate of photosynthesis) will decrease.

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