NEET BiologyNCERT Class 12Ecology and Environment
Ecosystem: NEET questions with solutions
Ecosystem tests productivity (GPP, NPP), decomposition, energy flow, the 10 per cent law and ecological pyramids. Marks are lost on arithmetic with GPP/NPP, on which pyramid can be inverted, and on factors that speed or slow decomposition.
Revise first: NCERT notes for EcosystemQuestions
10 questions · answers after you pick
1In a grassland, the producers fix 1200 g m⁻² yr⁻¹ of organic matter as gross primary productivity, and 400 g m⁻² yr⁻¹ is used in the…ProductivityEasySingle correct2Which type of ecological pyramid is always upright in every ecosystem?Ecological pyramidsEasySingle correct3Which statement about the major route of energy flow is correct?Food chains and food websEasySingle correct4Statements I and II below concern the rate and products of decomposition of detritus in an ecosystem. Which of the options is correct?DecompositionMediumStatement based5Read the Assertion and the Reason about biomass pyramids in a sea and choose the correct option.Ecological pyramidsMediumAssertion–Reason6Match the step of decomposition in Column I with the process in Column II.DecompositionMediumMatch the following7In the food chain grass → grasshopper → frog → snake, the grass fixes 5000 kJ of energy. Using the 10 per cent law, how much energy reaches…Trophic levels and the 10 per cent lawMediumSingle correct8What fraction of the incident solar radiation is photosynthetically active radiation (PAR)?ProductivityMediumSingle correct9In a forest the net primary productivity is 900 g m⁻² yr⁻¹, and the producers' respiration uses 40 per cent of their gross primary…ProductivityHardSingle correct10The biosphere's annual net primary productivity is about 170 billion tons (dry weight), of which the oceans, which cover about 70 per cent…ProductivityHardSingle correct
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