Based on my analysis of the nitrogen cycle diagram and the definitions provided, I can now solve both Test I and Test II.
For Test I (matching terms to the blank boxes in the diagram):
1. The top box (associated with atmospheric N₂ being converted to usable forms) should be "Fixation" - this is when gaseous nitrogen (N₂) is converted to ammonia (NH₃ or NH₄⁺).
2. The box on the left (showing bacteria converting organic matter to NH₄⁺) should be "Ammonification" - the process of converting organic nitrogen into ammonia.
3. The box at the bottom (showing bacteria converting NH₄⁺ to NO₃⁻) should be "Nitrification" - the two-step process where NH₃/NH₄⁺ is converted to NO₃⁻.
4. The box on the right (showing plants taking up NH₄⁺ and NO₃⁻) should be "Assimilation" - the process by which plants and animals incorporate nitrate and ammonia.
5. The box at the very bottom (showing conversion of NO₃⁻ back to N₂ gas) should be "Denitrification" - the reduction of NO₃⁻ to gaseous N₂ by anaerobic bacteria.
For Test II (matching definitions to terms):
1. "It is a two-step process in which NH3/NH4+ is converted to NO3-" → Nitrification
2. "It is the process by which plants and animals incorporate the NO3- and ammonia" → Assimilation
3. "It is the process of converting organic nitrogen into ammonia" → Ammonification
4. "It is the reduction of NO3- to gaseous N2 by anaerobic bacteria" → Denitrification
5. "It is when gaseous nitrogen (N2) is converted to ammonia (NH3 or NH4+)" → Fixation
This completes the solution to both tests based on the nitrogen cycle diagram.
Parent Tip: Review the logic above to help your child master the concept of nitrogen cycle worksheet.
