Q1. Which of the following is an example of an artificial ecosystem?, POND, AQUARIUM, FOREST, WET LAND, The breakdown of complex organic matter into inorganic substances by decomposers is called:, PRODUCTIVITY, DECOMPOSITION, ECOLOGICAL SUCESSION, LEACHING, Decomposition proceeds most rapidly under which conditions?, Low temperature and anaerobic conditions, Very dry conditions, Extremely low temperatures, Warm, moist and aerobic condition, The total rate of production of organic matter by plants through photosynthesis per unit area per unit time is called:, Net primary productivity, Secondary productivity, Gross primary productivity, Standing crop, Net primary productivity (NPP) is calculated as:, GPP + R, GPP − R, R − GPP, GPP × R, If the gross primary productivity of an ecosystem is 2,400 kcal m⁻² yr⁻¹ and plant respiration is 900 kcal m⁻² yr⁻¹, the NPP is:, 3,300 kcal m⁻² yr⁻¹, 1,500 kcal m⁻² yr⁻¹, 900 kcal m⁻² yr⁻¹, 2,400 kcal m⁻² yr⁻¹, In the food chain Grass → Grasshopper → Frog → Snake, the frog occupies which trophic level?, First, Second, Third, Fourth, A food web generally increases ecosystem stability because:, It provides alternative feeding pathways., It prevents all organisms from dying., It eliminates competition completely., It stops energy transfer to higher trophic levels., Which of the following is NOT a major step of decomposition?, Fragmentation, Leaching, Catabolism, Anaboloism, An aquarium requires regular feeding, cleaning and aeration mainly because it:, Has no abiotic components, B. Is a completely self-sustaining ecosystem, Depends on external inputs for maintaining balance, Does not contain producers

ECOSYSTEM

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