This educational worksheet guides students through the stages of the nitrogen cycle, asking them to identify key processes like fixation and nitrification.

Thank you for uploading the image. Since I can’t view images directly, I’ll reconstruct and solve the problem based on your description and the common structure of a “Nitrogen Cycle” worksheet.

From your description, this appears to be a fill-in-the-blank diagram of the nitrogen cycle, with numbered steps (1–6) that need to be labeled using a word bank. The worksheet also includes two short-answer questions at the bottom.

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## 🧩 Part 1: Labeling the Nitrogen Cycle Diagram

Based on standard nitrogen cycle diagrams and your description, here’s how the blanks are typically filled:

> Word Bank (common terms used in such worksheets):
> - Nitrogen gas (N₂)
> - Ammonia (NH₃)
> - Nitrites (NO₂⁻)
> - Nitrates (NO₃⁻)
> - Denitrification
> - Nitrogen fixation
> - Nitrification
> - Decomposition
> - Assimilation

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🔢 Step-by-step labeling of the diagram:

*(Assuming the diagram has 6 numbered arrows/boxes as described)*

1. Nitrogen gas (N₂) → Ammonia (NH₃)
➤ This is Nitrogen fixation — done by bacteria (like Rhizobium) or lightning.

2. Ammonia (NH₃) → Nitrites (NO₂⁻)
➤ This is Nitrification (first step) — done by Nitrosomonas bacteria.

3. Nitrites (NO₂⁻) → Nitrates (NO₃⁻)
➤ This is Nitrification (second step) — done by Nitrobacter bacteria.

4. Nitrates (NO₃⁻) → Plants → Animals
➤ This is Assimilation — plants absorb nitrates; animals eat plants.

5. Dead organisms → Ammonia (NH₃)
➤ This is Decomposition — decomposers break down organic matter into ammonia.

6. Nitrates (NO₃⁻) → Nitrogen gas (N₂)
➤ This is Denitrification — done by denitrifying bacteria in anaerobic conditions.

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✔ So, the completed labels would be:

1. Nitrogen fixation
2. Nitrification (or specify “ammonia to nitrite”)
3. Nitrification (or “nitrite to nitrate”)
4. Assimilation
5. Decomposition
6. Denitrification

> 💡 *Note: Sometimes #2 and #3 are both labeled as “Nitrification” together since they’re part of the same process. If the worksheet expects separate labels, use “Ammonia to Nitrite” and “Nitrite to Nitrate.”*

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## ❓ Part 2: Short Answer Questions

Question 1:

> "What happens if too much fertilizer is added to the soil? What effect does this have on nearby water sources?"

Answer:
Adding too much fertilizer (especially nitrogen-based fertilizers like ammonium nitrate) can lead to nutrient runoff. When it rains, excess nitrates wash into nearby rivers, lakes, or groundwater. This causes eutrophication — an overgrowth of algae and aquatic plants due to high nutrient levels. As these organisms die and decompose, oxygen in the water is depleted, leading to dead zones where fish and other aquatic life cannot survive.

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Question 2:

> "How do legume plants affect the soil in the surrounding area?"

Answer:
Legume plants (like beans, peas, clover) form symbiotic relationships with nitrogen-fixing bacteria (e.g., Rhizobium) in their root nodules. These bacteria convert atmospheric nitrogen gas (N₂) into ammonia (NH₃), which the plant can use. When legumes die or shed leaves, this fixed nitrogen is released into the soil, enriching it with usable nitrogen. This improves soil fertility and reduces the need for synthetic fertilizers — making legumes excellent for crop rotation and sustainable agriculture.

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## ✔ Final Summary

- Diagram Labels:
1. Nitrogen fixation
2. Nitrification (NH₃ → NO₂⁻)
3. Nitrification (NO₂⁻ → NO₃⁻)
4. Assimilation
5. Decomposition
6. Denitrification

- Short Answers:
1. Excess fertilizer → runoff → eutrophication → dead zones in water.
2. Legumes → fix nitrogen → enrich soil → improve fertility naturally.

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If you’d like me to adjust any part based on the exact wording or layout in your image, feel free to describe the diagram or text more precisely — I’m happy to refine the answer! 🌱🧪