Factors affecting photosynthesis.pdf - FACTORS AFFECTING PHOTOSYNTHESIS Rebecca Watson 12a Biology FACTORS THAT AFFECT PHOTOSYNTHESIS THE AIM Over the

Factors affecting photosynthesis.pdf - FACTORS AFFECTING...

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F A C T O R S A F F E C T I N G P H O T O S Y N T H E S I S Rebecca Watson 12a Biology
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FACTORS THAT AFFECT PHOTOSYNTHESIS THE AIM Over the previous lessons we had been studying the factors that affect the rate of photosynthesis. The purpose of this experiment is to observe one of the factors, we have chosen to investigate light intensity and how this affects the rate of photosynthesis occurring. RESEARCH QUESTION How does light intensity affect the rate of photosynthesis, by using the same plant each time, the same amount of water, the same color of light, all making it a fair test. Then only to be changing the distance between the source of light and the elodea plant? INTRODUCTION Photosynthesis is the process in which cells synthesize organic molecules (e.g. glucose) from inorganic molecules (CO 2 and H 2 O) in the presence of sunlight. This process requires a photosynthetic pigment (chlorophyll) and can only occur in certain organisms (plants, some bacteria) In plants, photosynthesis happens within an organelle called the chloroplast. Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts (mostly found in the mesophyll layer) contain a green substance called chlorophyll. Chloroplast absorbs red/blue light whilst it reflects the green light. The Diagram to the right shows the word equation of photosynthesis. (Nelson, Ken 2019, Fig 1) The Diagram to the left shows the chemical balanced equation of photosynthesis. (Jackie Klepner, 2018, Fig 2) The diagram to the right shows a labelled chloroplast showing the structure and the functions. (Cornell, B. 2016, Fig 3)
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FACTORS THAT AFFECT PHOTOSYNTHESIS Structure Function Thylakoid membrane Increased SA allows for greater absorption of light by the photosystems in the membrane Stroma Allows for the concentration of enzymes necessary for the Calvin cycle to occur Thylakoid space (lumen) Small space allows for the accumulation of protons to create a concentration gradient necessary for chemiosmosis to occur There are three main factors that affect the rate of photosynthesis which we can test, they include; temperature, carbon dioxide concentration and light intensity. There is a fourth factor too that affects the rate of photosynthesis however it is less commonly spoken about and experimented with, this factor is wave length. TEMPERATURE At low temperatures the rate of photosynthesis is very low. Because photosynthesis requires enzymes, as the temperature increases the amount of kinetic energy in the reactants increases, thereby increasing the rate of photosynthesis. This rate increases until an optimum temperature is reached. In plants this optimum temperature is usually between 25 and 35 degrees. After the optimum temperature is reached, the rate of photosynthesis drops dramatically, because the temperature can cause the enzymes to denature (lose their shape and active site) (Yifan Chen, 2017 Biology Elite, Ref 1) CARBON DIOXIDE CONCENTRATION CO2 is the essential molecule in the formation of organic molecules. At low CO2 concentrations, an increase in the amount of CO2 will increase the rate of photosynthesis. At
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