A lake food chain: phytoplankton → zooplankton → small fish → pike. Without fishing, the total pike biomass can grow by 8 kg in a season. On average 0.4 kg of phytoplankton is produced per 1 m³ of water. 1) Explain the ecological pyramid rule. 2) Find the biomass of small fish needed for an 8 kg increase in pike. 3) Find the phytoplankton biomass needed. 4) Calculate the volume of water (m³) producing this much phytoplankton. For each part, write out the law or method used (cross scheme, formulas, reasoning) and all calculations step by step.
The AI score is an estimate. In the official exam the written part is marked by BMBA examiners.