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

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Rate of Photosynthesis in Pond-Weed :: Papers

In this study, AFst0 showed similarly much less regional differences than AOT40. However, there is a difference of the result compared to Europe. In Europe, the exposure-based critical level for forest species is suggested. Values of the critical levels are defined as 5 ppm·h of AOT40. AOT40 values exceeding the European critical levels were shown in 89% of Japan. In Japan, Kohno et al. () suggested that 15-30 ppm·h AOT40 for moderately sensitive species (, ) from April to September as critical level for forest species. AOT40 values exceeding 30 ppm·h were shown in 21% of Japan. Some regions where the AOT40 values reached 30 ppm·h corresponded to cool and humid climate such as central-eastern Japan. Averaged stomatal ozone uptake was estimated to be higher than 40 mmol m-2 for the three species in central-eastern Japan (). In contrast, stomatal ozone uptake for did not show any difference between eastern and central Japan, although AOT40 in central Japan was twice that in eastern Japan. Emberson et al. () showed that VPD played a major role in limiting the stomatal ozone uptake. Also in this study, VPD is a limiting factor of the stomatal ozone uptake especially in warmer part of Japan (). For this reason, this region showed a discrepancy between the AFst0 values of and AOT40. These results suggest that not only ozone concentration but also stomatal closure induced by VPD affected the AFst0 in the warmer part of Japan.

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

They found that elevated CO2 increased rates of net photosynthesis in about 85% of the reported studies, while reducing stomatal conductances and rates of transpiration in approximately 75% of the cases analyzed....

Free rate of photosynthesis Essays and Papers - …

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

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.

where max is the maximum stomatal conductance. The other functions are limiting factors of max and are scaled from 0 to 1. min is the minimum stomatal conductance and is set to 0 in this study because we could not get data of min from the literatures. phen is the variation in stomatal conductance with leaf age, and light, temp, VPD, and SMD are functions of photosynthetically photon flux density at the leaf surface (PPFD, μmol photons m-2 s-1), temperature (T, °C), vapor pressure deficit (VPD, kPa), and volumetric soil water content (θ, m3 m-3), respectively.

10 Major Factors Affecting Photosynthesis

Photosynthesis need light to work, so light therefore should speed up the rate of photosynthesis.

I believe this will happen because when the light source is nearer to the plant more of the plants surface area is coming in to contact with the light from the desk lamp therefore more photosynthesis will occur which will mean more oxygen will be produced which will create more bubbles....

Prediction: I predict that as the light source (desk lamp) is moved closer to the pondweed (Elodea), the rate of photosynthesis will increase therefore more oxygen will be produced creating more bubbles.

Aim: To see if raising the light intensity increases the rate of photosynthesis.
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  • from 5.4 Factors Affecting Photosynthesis Worksheet.

    Three factors can limit the speed of photosynthesis: light intensity, carbon dioxide concentration and temperature.

  • Factors Affecting The Rate Of Photosynthesis Biology ..

    If it gets too cold, the rate of photosynthesis will decrease. Plants cannot photosynthesise if it gets too hot.

  • THE BEAUTY OF LIFE: Limiting Factors 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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What is the law of limiting factors

If the light intensity is not a limiting factor, there will usually be a shortage of NADP+ as NADPH accumulates within the stroma (see light independent reaction). NADP+ is needed for the normal flow of electrons in the thylakoid membranes as it is the final electron acceptor. If NADP+ is not available then the normal flow of electrons is inhibited. However, there is an alternative pathway for ATP production in this case and it is called cyclic photophosphorylation. It begins with Photosystem I absorbing light and becoming photoactivated. The excited electrons from Photosystem I are then passed on to a chain of electron carriers between Photosystem I and II. These electrons travel along the chain of carriers back to Photosystem I and as they do so they cause the pumping of protons across the thylakoid membrane and therefore create a proton gradient. As explained previously, the protons move back across the thylakoid membrane through ATP synthase and as they do so, ATP is produced. Therefore, ATP can be produced even when there is a shortage of NADP+.

Photosynthesis limiting factors ppt - TES Resources

Background information: Photosynthesis Photosynthesis is the process of autotrophs turning carbon dioxide and water into carbohydrates and oxygen, using light energy from sunlight.

A good ppt about limiting factors on photosynthesis

My graph shows that when the Elodea was 10cm away from the lamp
the rate of photosynthesis was high with there being around one bubble
produced per second The average amount of bubbles produced in 30
seconds was 58.

BBC - GCSE Bitesize: Factors limiting photosynthesis

When the Elodea was 20cm away from the lamp the rate
of photosynthesis decreases by more half as much with the average
number of bubbles produced being only 24.

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