Task

A steppe ecosystem has the food chain: grasses → grasshoppers → frogs → snakes → eagle. In one season the eagle’s body mass increased by 6 kg (assume entirely through this chain). Grass productivity is 2 kg/m² per year; a frog weighs 50 g on average, a grasshopper 2 g. 1) Describe the ecological pyramid rule (Lindeman’s rule) and the types of ecological pyramids. 2) Identify the trophic levels (producer, consumers) and describe the method of solution. 3) Calculate the grass biomass (t) needed for the eagle to gain 6 kg. 4) Calculate the area (m² and ha) on which this grass grows. 5) Calculate the biomass and number of frogs and grasshoppers the eagle needs. For each part, write out the law or method used (cross scheme, formulas, reasoning) and all calculations step by step.