In relation to the scientific method, explain each of the following:
(i) Data - Leaving Cert Biology - Question 7 - 2012
Question 7
In relation to the scientific method, explain each of the following:
(i) Data.
(ii) Replicates.
Answer the following by reference to some of the investigations th... show full transcript
Worked Solution & Example Answer:In relation to the scientific method, explain each of the following:
(i) Data - Leaving Cert Biology - Question 7 - 2012
Step 1
Data.
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Answer
In the scientific method, data refers to the observations or results obtained during an experiment. It can include both qualitative observations, such as color changes, and quantitative measurements, such as temperature or volume.
Step 2
Replicates.
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Answer
Replicates are repeats or copies of the same experiment that help ensure accuracy and reliability in results. By conducting the same experiment multiple times, scientists can confirm that their findings are consistent and not due to chance.
Step 3
How did you expose the semi-lunar valves when dissecting the sheep’s or ox’s heart?
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To expose the semi-lunar valves during dissection, I carefully cut open the aorta or the pulmonary artery to reveal the valves inside. This allows for direct observation of their structure and function.
Step 4
How did you show that alcohol was present when investigating the production of alcohol by yeast?
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Answer
I used a chemical test specifically designed to detect the presence of alcohol, such as the use of a reagent that changes color in the presence of ethanol, or I would use milk or starch as an indicator in the fermentation process.
Step 5
What type of agar plates did you use when investigating the digestive activity of seeds?
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I used milk or starch agar plates to observe the digestive activity of seeds. These media allow for the detection of enzyme activity through clear zones around the seeds.
Step 6
How did you demonstrate that digestive activity had taken place in the investigation referred to in part (iii)?
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I analyzed the results from the agar plates. A clear zone around the seeds would indicate that digestive activity had occurred, as it shows that enzymes have broken down the substrate in the plate.
Step 7
How did you demonstrate the requirement for oxygen when investigating the factors necessary for seed germination?
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I used an anaerobic jar to create an environment without oxygen and compared it to a control setup that included oxygen. By monitoring seed germination rates in both conditions, I could demonstrate the necessity of oxygen for germination.
Step 8
What did you use as the selectively permeable membrane in your investigation of osmosis?
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I used visking tubing, which acts as a selectively permeable membrane, allowing certain substances to pass through while blocking others. This was essential for observing the osmotic effects of solute concentration.
Step 9
What growth regulator did you use when investigating plant growth?
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I applied Indole-3-Acetic Acid (IAA), which is a plant hormone that promotes growth and development. This helped in studying the effects of growth regulators on plant behavior.
Step 10
What is the total magnification of the image?
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The total magnification is calculated by multiplying the magnification of the eyepiece lens by that of the objective lens. Therefore, for an eyepiece marked ×10 and an objective marked ×20, the total magnification would be:
extTotalMagnification=10imes20=200
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