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Biology Grade 10 Unit 6: Ecological Interaction

national exam questions have come from this unit. It runs 24 pages; one careful study pass takes about 3.1 hours, and its difficulty is harder among Biology units. Each section below lists the questions set from it, with the year, and opens the page that teaches it.

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6.1 Trophic Levels · read p. 155
  • 2017 E.C., Q10 – Consider the following diagram of pyramid of biomass. Which one of the following statements is correct about the above pyramid of biomass? Question Diagram
  • 2017 E.C., Q8 – This item is based on the following diagram of simple food chain. Leaves → Grasshoppers → Rodents → Leopards What will happen if the number of rodents significantly decrease? There will be
  • 2016 E.C., Q52 – This item is based on the following pyramid of biomass. Which alternative contains organisms that can occupy the above pyramid of biomass from the bottom to the top?
  • 2015 E.C., Q65 – Consider the following diagram demonstrating the pyramid of energy. Which of the following is INCORRECT about the above pyramid of energy?
  • 2014 E.C., Q33 – If you are asked to draw a pyramid of biomass of an aquatic habitat that contains zooplanktons, herrings, sea lions and phytoplankton, which organisms should be placed at the top of the pyramid?
  • 2013 E.C., Q43 – Nothing else is drawn or labelled; a small 'Scanned with CamScanner' watermark sits at the bottom left of the image.]
  • 2012 E.C., Q7 – As energy from the sun, enters the ecosystem in the form of light, one of the following happens to it. It
  • 2011 E.C., Q9 – What is another name for secondary consumer?
  • 2010 E.C., Q24 – What is the nutritional mode of those bacteria which decompose dead organic matter and thus recycle nutrients?
  • 2010 E.C., Q26 – Which of the following is NOT true about the flow of energy in the ecosystem?
  • 2010 E.C., Q17 – In the energy pyramid, which group of organisms has least amount of energy?
  • 2009 E.C., Q56 – The total amount of living tissue within a given trophic level is called:
  • 2009 E.C., Q18 – Which of the following is NOT recycled in the ecosystem?
  • 2006 E.C., Q19 – Which of the following statement is true about matter and energy in the ecosystem?
  • 2006 E.C., Q39 – What is the ultimate source of renege for all organism living on the earth?
  • 2006 E.C., Q57 – Which of the following resources is needed by an ecosystem from outside in order to sustain itself
  • 2005 E.C., Q8 – Which one of the following do bees use to inform other bees about location and distance of a new source of nectar they discover?
6.1.1 Food chain and food web · read p. 155
Not asked in a national paper yet.
6.2 Cycling of Materials in an Ecosystem · read p. 159
  • 2012 E.C., Q2 – Which one of the following statements is true regarding the need for recycling nutrients through an ecosystem?
  • 2012 E.C., Q4 – As succession progresses, the bare land turns out to be productive Due to the fact that the
  • 2011 E.C., Q68 – As an ecological succession passes from a lower to a higher seral stage, which of the following will NOT happen?
  • 2010 E.C., Q47 – Carbon cycle is important in nature because:
  • 2010 E.C., Q10 – What kind of nutrition do most of the decomposers have in general?
  • 2010 E.C., Q4 – Why do micro-organisms decompose dead organic matters?
  • 2009 E.C., Q33 – Which of the following is the major role-played by bacteria and fungi in the ecosystem?
  • 2009 E.C., Q73 – What mode of feeding do soil organisms that release nutrients from dead organic matter in to the soil have?
  • 2009 E.C., Q36 – Which of the following processes is most important to release nutrients from dead organic matter in to the soil?
  • 2008 E.C., Q61 – Which of the following processes involved in the water cycle is carried out by green plants?
  • 2007 E.C., Q8 – Which group of organisms in the ecosystem release nutrients locked up in dead bodies of organisms?
  • 2005 E.C., Q28 – What is the important role played by microorganism such as bacteria and fungi in the ecosystem?
  • 2005 E.C., Q58 – Which of the following is an ecosystem
6.2.2 Carbon cycle · read p. 162
  • 2018 E.C., Q89 – Which of the following is a direct consequence of photosynthesis for life on Earth?
  • 2017 E.C., Q61 – In a hypothetical scenario where photosynthesis ceased to occur on the earth, the longterm consequences on the continuity of life would be
  • 2017 E.C., Q67 – How does photosynthesis ensure the continuity of life? By
  • 2017 E.C., Q98 – Which one of the following local community practices in Ethiopia is considered as an environmental action that addresses climate change mitigation? Culture of
  • 2015 E.C., Q73 – Which one of the following events happens during carbon cycle? Carbon dioxide is
  • 2015 E.C., Q90 – All of the following sentences are correct about pollution EXCEPT
  • 2012 E.C., Q3 – What is the impact of humans on the sulphur cycle? Production of
  • 2009 E.C., Q76 – Among the following four processes, identify the one that probably evolved before all the other three.
  • 2008 E.C., Q84 – Which of the following way is an important way by which green plants mitigate the green house effect?
  • 2007 E.C., Q33 – Which one of the following processes has a decreasing effect on the concentration of atmospheric carbon dioxide?
  • 2007 E.C., Q40 – What is the long term primary effect of the current tree planting activities that Ethiopia is undertaking ?
6.2.3 Nitrogen cycle · read p. 164
  • 2018 E.C., Q61 – What is the primary difference between fungi and plants?
  • 2018 E.C., Q70 – What role do microorganisms play in agriculture?
  • 2015 E.C., Q17 – Which one of the following bacteria produces ammonium ion by forming a symbiotic association with peas and beans?
  • 2014 E.C., Q23 – Which stage of the nitrogen cycle needs the role of Rhizobium?
  • 2011 E.C., Q28 – Which bacterial genus fixes nitrogen in the nodules of leguminous plants?
  • 2011 E.C., Q43 – What is the general name of crop plants that add nitrogen to the soil because of their symbiotic association with certain types of bacteria?
  • 2009 E.C., Q95 – Which group of bacteria reduces nitrate to nitrogen gas in th nitrogen cycle?
  • 2007 E.C., Q45 – From where do plants get most of their nutrients?
  • 2006 E.C., Q16 – Which of the following parts of plant roots is harboring nitrogen fixing bacteria
  • 2006 E.C., Q27 – Which of the following forms of nitrogen are readily utilization by green plants?
  • 2005 E.C., Q7 – Which component of soil fertility is improved when farmers grow legumes in crop rotation ?
6.2.4 Phosphorus cycle · read p. 170
  • 2018 E.C., Q24 – Which of the following is NOT a requirement for photosynthesis?
  • 2017 E.C., Q17 – Which of the following is NOT a key process involved in carbon cycle?
  • 2016 E.C., Q53 – The two reverse processes that play a significant role in absorbing and releasing carbon dioxide, respectively are
  • 2013 E.C., Q36 – Which one of the following orders of life processes correctly illustrates occurrence of the nutrient cycle?
  • 2013 E.C., Q37 – Which of the following processes in the phosphate cycle DOES NOT return phosphate ions to the soil?
  • 2011 E.C., Q17 – Which of the following statements best describes the role of bacteria in the nitrogen cycle? Bacteria turn:
  • 2011 E.C., Q16 – Both photosynthesis and respiration are involved in:
  • 2010 E.C., Q27 – Through which of the following processes do all living organisms contribute to carbon cycle?
  • 2008 E.C., Q27 – In the carbon cycle, which of the following processes removes carbon dioxide from the atmosphere?
  • 2008 E.C., Q44 – Which of the following processes releases in to the atmosphere?
  • 2008 E.C., Q6 – of the following, which one is the main source form which plants get the nutrients necessary for their growth and development?
  • 2006 E.C., Q61 – In which of the following ways is the carbon dioxide of the atmosphere fixed in to the Carbone found in organic molecules?