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In the case of any two of the following, describe a laboratory or a field method: (a) To show the effect of a mineral deficiency on crop growth - Leaving Cert Agricultural Science - Question 4 - 2019
Question 4
In the case of any two of the following, describe a laboratory or a field method: (a) To show the effect of a mineral deficiency on crop growth. (b) To estimate th... show full transcript
Worked Solution & Example Answer:In the case of any two of the following, describe a laboratory or a field method: (a) To show the effect of a mineral deficiency on crop growth - Leaving Cert Agricultural Science - Question 4 - 2019
Step 1
To show the effect of a mineral deficiency on crop growth.
Answer
To demonstrate the effect of a mineral deficiency on crop growth, you can utilize a controlled growth experiment. Begin by preparing two groups of seedlings in sterile flasks with deionized water, with one group receiving the specific mineral nutrient and the other serving as a control without it.
After ensuring that both groups are exposed to the same environmental conditions, such as light, temperature, and time, record the growth metrics over a defined period. You can assess plant height, leaf number, and overall health as indicators of growth.
At the end of the experiment, compare the differences in growth between the two groups and analyze how the mineral deficiency affected the development of the crop.
Step 2
To estimate the percentages of water and solids in a sample of milk.
Answer
To estimate the percentages of water and solids in a milk sample, start by measuring a clean, dry container's mass. Next, accurately weigh the milk sample and record its mass.
Then, dry the milk by placing the container in an oven or on a hotplate at 100°C until all moisture evaporates. This process will leave only the solid components of the milk in the container. After the drying process, allow it to cool and then measure the mass of the container plus the solids.
To find the percentage of water and solids, use the mass calculations:
- Mass of solids = mass of container plus solids - mass of container.
- Mass of water = original mass of milk - mass of solids.
- Calculate the percentages:
- Percentage of solids = (mass of solids / original mass of milk) * 100.
- Percentage of water = (mass of water / original mass of milk) * 100.