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Three of the major elements needed for good plant growth are nitrogen (N), phosphorus (P), and potassium (K) - Leaving Cert Agricultural Science - Question b - 2018
Question b
Three of the major elements needed for good plant growth are nitrogen (N), phosphorus (P), and potassium (K). (i) In the case of each element describe 1. Its functi... show full transcript
Worked Solution & Example Answer:Three of the major elements needed for good plant growth are nitrogen (N), phosphorus (P), and potassium (K) - Leaving Cert Agricultural Science - Question b - 2018
Step 1
In the case of nitrogen (N) describe
Answer
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Its function in the plant: Nitrogen is essential for the formation of chlorophyll, which is crucial for photosynthesis. It also plays a significant role in the creation of amino acids, the building blocks of proteins.
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A deficiency symptom: Deficiency in nitrogen leads to slow growth or low yield, characterized by pale green color or yellowing of the leaves.
Step 2
In the case of phosphorus (P) describe
Answer
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Its function in the plant: Phosphorus is vital for root growth and reproduction. It is also important for flower and seed formation as it contributes to energy transfer within the plant.
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A deficiency symptom: A deficiency in phosphorus can cause stunted growth or low yield, and may be indicated by blue coloration on leaves or a lack of flowers.
Step 3
In the case of potassium (K) describe
Answer
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Its function in the plant: Potassium is important for protein synthesis and helps the plant in translocation, which is the movement of nutrients. It also enhances disease resistance and contributes to the formation of seeds and fruits.
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A deficiency symptom: A potassium deficiency can result in reduced yield, poor growth, and symptoms such as scorching of leaves, lodging, or poor root development.
Step 4
Describe a laboratory experiment to show the effect of the deficiency of a particular element in a plant.
Answer
To demonstrate the effect of nutrient deficiency in a controlled environment, you can perform the following steps:
- Sterilize test tubes or containers with seedlings in two tubes, one with the complete nutrient tablet and one with a tablet minus the deficient nutrient.
- Ensure that both tubes are aerated similarly and covered to prevent contamination.
- Allow the seedlings to grow for a minimum of two weeks under the same environmental conditions to prevent any bias in growth.
- Measure the growth, color, and overall health of the plants periodically, comparing the results between both sets.
- Document the differences observed, analyzing the symptoms resulting from the absence of the particular nutrient.