Explain how fertilizer runoff can increase growth, decomposition and biological oxygen demand in aquatic systems.
Tę umiejętność sprawdza 5 zadań wzorowanych na arkuszach IB z lat 2023–2026.
Runoff rich in nitrate enters a small pond and stimulates eutrophication. Which pair of changes is expected during the developing algal bloom and subsequent decay? A. Less algal biomass and lower microbial oxygen demand B. More algal biomass and greater…
Why can excess nutrient runoff reduce the diversity of animals in a lake? A. Phosphate necessarily biomagnifies as a poison in every food chain B. Decomposition following excessive algal growth depletes dissolved oxygen C. Additional nutrients make all aquatic…
Following nutrient enrichment, a lake experiences a dense algal bloom that later dies. What most directly drives the subsequent fall in dissolved oxygen? A. Aerobic microbes consume oxygen while decomposing the dead biomass B. Photosynthesis stops producing…
Repeated nitrate runoff stimulates a lake algal bloom, followed by increased decomposition. What is expected? A. Conversion of nitrates into persistent plastic B. Greater biochemical oxygen demand C. A universal increase in shell calcium carbonate D. Immediate…
Outline two ways livestock production can alter nutrient cycling.
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