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The Effect of Temperature on Rate of Photosynthesis

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Sabrena Abdurazak

on 4 November 2014

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Transcript of The Effect of Temperature on Rate of Photosynthesis

The rate of photosynthesis is affected by things such as light intensity and temperature. We did our experiment on the effect of photosynthesis with the change of different temperatures on a spinach plant. The temperature can be varied by changing the temperature to cold and hot by using a thermometer to measure the temperatures increase or decrease and then see at what time it stops photosynthesizing.

What it's about?
The Effect of Temperature on Rate
of Photosynthesis

How does temperature affect photosynthesis?
What is the plants optimum temperature?
Whats happens when the plant is not at its optimum temperature?
Testable Questions
If the temperature is low, then the rate of photosynthesis is slower. If the temperature is at high, then the rate of photosynthesis doesn't occur anymore, the enzyme in the plant denatures. If the temperature is at its optimum temperature, then the rate of photosynthesis will be at its fastest ("Factors Affecting the Rate of Photosynthesis.").

2 small beakers
1 larger beakers (for the cold bath)
Spinach leaves
Hole punch
10 ml of Sodium Bicarbonate Solution
90 ml of Distilled water
Hot plate
Fluorescent lamp (does not give off heat)
2 Thermometers

During our experiment, we found that temperature does indeed affect the rate of photosynthesis and also that the optimum temperature that the plant can photosynthesize was between 20°C to 30°C. There wasn't a specific temperature found because we used 2 different spinach plants for the experiment over the days it was conducted. If the temperature was any lower, then

the rate would decrease and if it were any higher, then the enzymes in the plant would denature so that the plant wouldn't be able to conduct photosynthesis any longer. This means that the hypothesis we made before the experiment was correct; if the temperature was low, then the rate of photosynthesis would be slower and if the temperature is at its optimum point, then the rate of photosynthesis will be at its fastest. Also if the temperature is at high, then the rate of photosynthesis can not be done again.
We later realized that the older spinach plant was more efficient than the fresher one which was bizarre. It was thought that the one that was newly bought would have worked better than the older one because the older one, at parts, were dying. We additionally saw that with the older spinach plant, the reaction was faster. The spinach disc would rise at a faster time than the one with the newer spinach plant.
Calhoun, Nolan, Joey Parnell, and Kyle Flickinger. "Temperature's Effect on the Rate of Photosynthesis." Prezi.com. N.p., 3 Dec. 2012. Web. 25 Oct. 2014. <http://prezi.com/o6tabc0osiqu/temperatures-effect-on-the-rate-of-photosynthesis/>

"Factors Affecting the Rate of Photosynthesis." - Pass My Exams: Easy Exam Revision Notes for GSCE Biology. Pass My Exams, 2012. Web. 22 Oct. 2014. <http://www.passmyexams.co.uk/GCSE/biology/factors-affecting-rate-of-photosynthesis.html>

Work Cited
This is the how the graph looks for our experiment, as you can see, we have that the optimum around 25°C because it is supposed to be between 20°C to 30°C.
6CO2 + 6H2O + Light Energy--->C6H12O6 + 6O2
First, we gathered 2 small beakers. Then, we punched holes fifteen discs of spinach leaves for each beaker. We put sodium bicarbonate in both small beakers. We then put ice in one larger beaker, then measured it until it cooled down to 5C. Next, we put the other small beaker with sodium bicarbonate on a hot plate until it reached our desired temperature, 30C. We used a thermometer to measure the temperature. Once both got to the temperature we wanted them to be, we put the leave discs into a syringe to take the oxygen out of them. We closed the airspace by sucking in water, then shaking and swirling the syringe. Next, we tapped it and pushed the air out. We repeated this for every temperature solution and emptied them into their beakers. We put them both into the light that was 15cm away from both the beakers. We then repeated our prcedure for both 10C and 40C.
Equation of Photosynthesis
Full transcript