Energy flow in the ecosystem   In an ecosystem, the main energy input is: (a) Heat energy (b) Chemical energy from decomposition (c) Solar energy (d) Geothermal energy Answer: (c) Solar energy Explanation: Solar energy is trapped by producers (autotrophs) via photosynthesis. According to Lindeman’s law, the average energy transfer between trophic levels is: (a) 1–5% (b) 10% (c) 30% (d) 50% Answer: (b) 10% Explanation: Only ~10% energy transfers to the next trophic level; rest is lost as heat/metabolism. Which pyramid is always upright? (a) Pyramid of biomass (b)…

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