To explain the meaning of his principle Blackman cited the following example. You will measure how long it takes in seconds for the disks to float as a way to measure the rate of photosynthesis.
When the intensity of light falling on a photosynthesizing organ is increased beyond a certain point, the cells of that organ become vulnerable to chlorophyll catalyzed photo-oxidations. Brainstorming will bring out possible reasons and variables that would influence photosynthesis.
What is the optimal concentration of sugar in 60 mL of water for yeast? To investigate the difference in growth rates between yeast cultures that have been grown in different carbon sources. Each person should have done their experiments in a different room to cut out all background light.
Give students time to design experiment and do a trial run. Photo-oxidation is maximal when O2 is present or carotenoids are absent or CO2 concentration is low. Photoinhibition is caused by the absorption of too much light which inactivates and dama reaction centre of PSII.
The curve is very shallow and levels off towards a light intensity of - When the topic of the rate of photosynthesis is raised, the time comes into play.
By increasing the CO, concentration at a fixed intensity of light, the rate of photosynthesis can be increased up to a particular concentration of CO after which no further increase can be noticed.
A good way to investigate this might be with the help of algae and you can use the 'Immobilised Algae' practical for this. The line goes up steadily but then between a light intensity of and levels off very quickly.
Furthermore, the factors affecting photosynthesis can be separated loosely into two categories, being internal and external factors.
In other words, it is the same as asking how fast does photosynthesis take place. We would also do well to bear in mind that if we remove the source of light, the rate of CO2 fixation falls to zero immediately.
This would have increased the rate of reaction of the plant's enzymes which would have increased the photosynthesis rate. When CO2 and temperature are not limiting and light intensities are low, the rate of photosynthesis increases with an increase in its intensity. Assessment Two rubrics will be used to assess student lab report sample of report included below and student participation.
They therefore have no stomata and absorb all their CO2 by diffusion through the leaves. With the further increase in the concentration of CO2 progressively the rate of carbon assimilation increases slightly and then it becomes independent of CO2 concentration.
When the intensity of light falling on a photosynthesizing organ is increased beyond a certain point, the cells of that organ become vulnerable to chlorophyll catalyzed photo-oxidations.
Optimum or saturation intensities may vary with different plant species e. Water is an essential raw material in carbon assimilation. It is also assumed that primary factor of dehydration in retarding photosynthesis is due to stomatal closure which reduces CO2 absorption.
Secondly, oxygen may compete with CO2 and hydrogen becomes reduced in place of CO2.In dry weather and in drought conditions water is found to be the factor limiting the rate of photosynthesis.
The non-availability of water also influences photosynthesis indirectly as it affects the availability of carbon dioxide.
Factors Affecting The Rate Of Photosynthesis. A Level Biology Project Aims I plan to investigate how different factors affect the rate of photosynthesis. I will be changing the levels of light and CO2 and then measuring the photosynthetic rate. Introduction.
The reason that light intensity does affect the rate of photosynthesis is because as light, and therefore energy, falls on the chloroplasts in a leaf, it is trapped by the chlorophyll, which then makes the energy available for chemical reactions in the plant/5(1). This could be because photosynthesis is occurring at it's maximum possible rate or because another limiting factor is limiting the rate of reaction.
Distilled Water With the distilled water the rate of reaction went up from to when the light intensity was increased from to Dec 21, · Factors Affecting Photosynthesis By understanding the factors that affect photosynthesis, one can better understand the rate of the process.
Light: Without light, a plant cannot photosynthesize very quickly, regardless of whether there are water and CO 2 or not. of the rate of photosynthesis occurring in the leaf disks. Descriptive title of experiment: The effect of _____ on the rate of photosynthesis. Purpose / Introduction Hypothesis; (use if/ then format) Explain the logic of the stated hypothesis Sketch of the experimental design used.Download