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In the case of any two of the following describe a laboratory or field method: (a) To determine the percentage (%) sugar in a sample of grass - Leaving Cert Agricultural Science - Question 4 - 2018
Question 4
In the case of any two of the following describe a laboratory or field method: (a) To determine the percentage (%) sugar in a sample of grass. (b) To show the effe... show full transcript
Worked Solution & Example Answer:In the case of any two of the following describe a laboratory or field method: (a) To determine the percentage (%) sugar in a sample of grass - Leaving Cert Agricultural Science - Question 4 - 2018
Step 1
To determine the percentage (%) sugar in a sample of grass.
Answer
To determine the percentage of sugar in a sample of grass, follow these steps:
- Sample Preparation: Take a fresh grass sample and chop it into small pieces.
- Freezing or Squeezing: Place the chopped sample in a freezer bag and either freeze it, roll it, or squeeze the contents to extract the juice.
- Measurement: Use a refractometer to measure the refractive index of the juice.
- Calculate Percentage: Read the percentage of sugar directly from the refractometer scale.
- Repeating the Experiment: It is important to repeat the measurements to establish statistical significance.
Step 2
To show the effect of shading on crop growth.
Answer
To investigate the effect of shading on crop growth:
- Experimental Design: Set up two plots, one with shade (using a cover or similar) and one without (control).
- Sowing Seeds: Sow the same type of crop seeds in both shaded and unshaded plots.
- Data Collection: Monitor the crop growth over a fixed period; measure and record the height and health of plants.
- Comparison: Analyze the differences in crop performance between the two plots.
- Statistical Analysis: Conduct a statistical analysis to determine if the differences observed are significant.