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Posted: September 29th, 2023
All living things require energy in carrying out activities. The process by which energy is made available from nutrient of cells is called cellular respiration. Cellular respiration is the controlled release of energy, in the form of ATP from organic compounds in cells.
Respiration occur under two conditions which is with the presence of oxygen and without the presence of oxygen. If there is presence of oxygen, then the process is called aerobic respiration. However, if there is lack or absence of oxygen, then it will refer as anaerobic respiration.
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Respiration involves enzyme that can be affected by the temperature. The rate of the respiration increase with the increase in temperature until it reaches the optimum temperature. This is where the rate of the respiration is the highest. Further increase in temperature only lowered the activity of the enzyme as it begins to denature.
How does the temperature affect the rate of respiration?
Investigate the effect of heat towards the rate of respiration of Mung beans.
The rate of respiration increases with the increase in temperature. This will continue until it reaches 60oC where the rate of respiration is the highest.
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Temperature of the solution with the mung beans
300C,400C,500C and 600C
0C
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The mung beans and the Bromcresol solution is put inside water bath with temperature 300C until it reaches they reach the temperature. Then, the mung beans are put inside the Bromcresol solution. The experiment is then repeated replacing the temperature to be 400C, 500C and 600C.
Time taken for Bromcresol solution to change from purple to yellowish colour.
Minutes and seconds (mins:s)
The time taken for the Bromcresol solution to change from purple to yellowish colour is measured using a digital stopwatch and recorded for every repeated experiment.
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Mass of mung beans
g
100g of mung beans is measured using electronic balance and is used in every repeated experiment.
With the same number of mung beans, comparison between every repeated experiment can be made easily as the amount of the mung beans is the same by controlling its mass. If the mass is varied, the result will be hard to compare with the other.
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Types of beans used
Mung beans is used for every repeated experiment.
The same type of beans will ensure the equality of each experiment and enable comparison of results obtained from the experiments. Different type of beans may respire with different rate and affect the result of the experiment.
Volume of Bromcresol
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Drops
6 drops of Bromcresol is added using a dropper in the preparation of the indicator solution.
Bromcresol is used to detect the presence of carbon dioxide. With the increase of number of drops of bromcresol, the experiment will take more time for the reaction to occur. 6 drops of bromcresol ensures the experiment can be completed in the given time period.
Quantitative data:
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Temperature
oC ± 0.05oC
Time taken for solution indicator to change to yellowish colour, minutes and seconds ±0.001seconds
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Qualitative data:
Initial
When the indicator solution is added into the test tube containing the mung beans, the colour of the solution is purple.
Final
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After a few minutes, the colour of the solution changes from purple to yellow. In the room temperature, 30 oC, the test tube feels warm.
Table 1.2 – Shows The Qualitative data obtained by observation at initial and final result.
For the ease of calculations, the unit of time is changed to seconds. To change the unit of minutes and seconds into seconds we can use the following formula:
As an example, in trial 1at 30oC, the time taken was 14:40 minutes. To change the unit into seconds, the calculation is:
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(14×60) + 40 = 880 seconds.
The calculations for other temperature are tabulated in the table below:
Temperature
oC ± 0.05oC
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Time taken for solution indicator to change to yellowish colour, seconds ±0.001seconds
Average time taken is calculated to find the mean of the time taken for the solution to change to yellow from purple. The average time taken for each temperature is calculated by using the following formula:
As example of the calculations, the average time taken for the purple colour of indicator solution to turn to light yellow colour at 30oC :
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= 776 seconds
Therefore, the average time taken for the purple colour of indicator to turn to yellow at 30oC is 776 seconds.
Temperature
oC ± 0.05oC
Time taken for solution indicator to change to yellowish colour, seconds ±0.001seconds
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To calculate the uncertainty for the average time taken, we can use the formula of standard deviation:
sd= ;
Where,
sd= Standard Deviation
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∆= uncertainty
mean= average time taken
x= time taken
n= number of trial
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As an example, below is the calculation for the experiment at temperature of 30oC where the average time taken is 776.00:
30
1
880.00
10816
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168.78
2
880.00
10816
3
484.00
85264
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4
860.00
7056
Table 2.3 – calculation for the experiment at temperature of 30oC
For the other value, the calculation is made and is tabulated in the following table:
Temperature
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oC ± 0.05oC
Time taken for solution indicator to change to yellowish colour, seconds ±0.001seconds
Average time taken, seconds
±0.001seconds
After obtaining the average time taken, we can easily calculate the rate of respiration of the beans. Rate of respiration is calculated by using the formula of:
As an example, at 30°C, the rate or respiration is:
= 0.001289 s-1
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Therefore, the rate of respiration at 30°C is 0.001289 s-1. Table below shows the calculation for the other values:
Temperature
oC ± 0.05°C
Average time taken, seconds
±0.001seconds
Uncertainty of average time taken, seconds.
The uncertainty of the rate of respiration can be calculated after obtaining the rate of respiration itself. To calculate the uncertainty of rate of respiration, the formula is:
∆R = x R
Where,
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R = Rate of time taken
t = time taken
∆ = uncertainty
At 30°C, the rate of respiration is 0.001289 s-1. The uncertainty of rate of respiration is calculated as example below:
∆R = x 0.001289
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= 0.0002804 s-1
Therefore, the rate of respiration at 30°C is 0.001289 s-1 ±0.0002804 s-1 .
The following table shows the rate of respiration of the mung beans for every temperature:
Temperature
oC ± 0.05°C
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Average time taken, seconds
Uncertainty of average time taken, seconds.
Rate of respiration, s-1
Uncertainty of rate of respiration, s-1
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Based on table 2.6, the graph of rate of respiration against temperature can be plotted.
Theoretically, the rate of respiration increase when the temperature increase until it reaches optimum temperature. At the optimum temperature, the rate of respiration is at the highest. After that, the rate of respiration will drop due to the denatured of the enzyme that involve in respiration.
But after the experiment is done, the results obtained shows that the rate of respiration keeps increasing till 60oC. We can say based on our experiment, the optimum temperature for the respiration of mung beans is more than 60oC.
The error is too small to be shown on the graph. This is because less error is being put in doing the experiment and safety precaution is taken.
The rate of respiration increases as the temperature increases until it reaches optimum temperature. Enzyme works efficiently at higher temperature because high energy is required for the enzyme undergoes the effective collision with the substrate frequently.
The Bromcresol solution function is to determine the existence of carbon dioxide gas in the air. If there is carbon dioxide gas, it will change colour from dark brown to yellow. So, time taken for the solution to change colour can be used up to measure the rate of respiration.
1. It is difficult to maintain the temperature of the test tube in 60°C as there is no electronic water bath is available.
Suggestion: The water for 60°C should be added so that it is easier for the students to maintain the experiment at 60°C rather than having their own water bath using Bunsen burner and beaker.
2. The exposure of the bromcresol solution to the surrounding may affect its reliability as an indicator. Some carbon dioxide gas from human respiration will affect the colour of the indicator.
Suggestion: The test tube that contains the bromcresol solution must be closed by using rubber stopper at all times.
3. The usage of distilled water in preparing the indicator solution is not suitable as the solution will be yellow when added with bromcresol.
Suggestion: Students should be aware of different situations of different solution and advised to use tap water in similar upcoming experiments
The rate of respiration increases with the increase in temperature. This will continue until it reaches 60oC where the rate of respiration is the highest. From this experiment, the optimum temperature of the respiration of the mung beans is 60oC. Hypothesis is accepted.
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