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State one function of nitrogen in plants - Leaving Cert Agricultural Science - Question (b) - 2006
Question (b)
State one function of nitrogen in plants. Describe in detail any two steps in the nitrogen cycle.
Worked Solution & Example Answer:State one function of nitrogen in plants - Leaving Cert Agricultural Science - Question (b) - 2006
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Describe in detail any two steps in the nitrogen cycle.
Answer
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Nitrogen Fixation: This step involves the conversion of atmospheric nitrogen (N₂) into ammonia (NH₃) by nitrogen-fixing bacteria, which can be found in the soil or in the root nodules of certain plants (like legumes). This process is essential as most plants cannot utilize atmospheric nitrogen. Bacteria like Rhizobium and Azotobacter are commonly involved in this process.
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Nitrification: This is a two-step process where ammonia (NH₃) is first oxidized to nitrites (NO₂⁻) by bacteria such as Nitrosomonas, and then to nitrates (NO₃⁻) by another group of bacteria called Nitrobacter. Nitrates are a more usable form of nitrogen for plants, allowing them to uptake this nutrient effectively through their roots.