IB Biology HL 4.2.22 Human impacts on nutrient cycles Question Bank
Practise IB Biology HL 4.2.22 by analysing nutrient-cycle evidence and human disruption of soil and phosphorus flows.
- Syllabus
- First assessment 2025
- Course
- Biology HL
- Level
- HL
Exam points
- Trace ammonium sources and transformations in a nutrient cycle.
- Evaluate how agriculture, weather and human activity disrupt nitrogen or phosphorus cycling.
C4.2.22—Recycling of all chemical elements question 1
Where high amounts of ammonium ions are present in agricultural areas, gaseous ammonia can be released into the atmosphere. This ammonia can dissolve and be carried across distances and then be deposited through precipitation. In a study of the effects of deposition of ammonium in a forest, soil samples were taken starting at the forest edge next to an open field and moving toward the centre of the forest.
List two sources of the ammonium in the forest soils apart from deposition in rainfall.
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