IB ESS SL 4.2.7 Industrial Water Conservation Question Bank
Evaluate industrial strategies for reducing water use and pollution.
- Syllabus
- First assessment 2026
- Course
- ESS SL
- Level
- SL
Evaluate industrial strategies for reducing water use and pollution.

Figure:Water stress for selected crops
Water stress is the total annual extraction of water as a proportion of the renewable supply in a given area. If the extraction represents 40 % or more of the available supply it is described as a high risk area.
Identify two strategies that could be used to grow crops in areas of high water stress.
Identify two strategies that could be used to grow crops in water stressed areas.
improved irrigation efficiency eg drip irrigation; use crop cultivars that require less water (eg drought resistant seeds/GMOs) / replace high stress crops (eg cotton) with low stress (eg oats);
improve water catchment/storage with dams; reservoirs;
install desalinization plants in coastal areas; plant cover crops/use terracing (to reduce evaporation/run-off losses); use salt-tolerant crops to exploit available sea-water/saline soils;
Do not credit simply "irrigation". Too vague.