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Biology Grade 9 Unit 6: Ecology

national exam questions have come from this unit. It runs 26 pages; one careful study pass takes about 2.9 hours, and its difficulty is moderate 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 Ecology · read p. 139
Not asked in a national paper yet.
6.1.1 Definitions of Ecological Terms · read p. 139
Not asked in a national paper yet.
6.1.2 Biotic and abiotic components · read p. 140
  • 2016 E.C., Q51 – The ability of carnivores to survive in an ecosystem is dependent on the
  • 2009 E.C., Q8 – What do we call the place where organisms live in their ecosystem ?
  • 2007 E.C., Q63 – Which one of the following is a biotic factor operating within an ecosystem?
6.1.3 Ecological levels · read p. 143
Not asked in a national paper yet.
6.1.4 Ecosystems · read p. 144
Not asked in a national paper yet.
6.1.5 Biomes · read p. 145
  • 2015 E.C., Q37 – Which one of the following sentences describes the tropical rainforest biome? It has
  • 2015 E.C., Q38 – Fresh water biomes like streams and rivers are characterized by the presence of
  • 2014 E.C., Q25 – What are the common plants of the boreal forest?
  • 2013 E.C., Q4 – Which one of the following processes describes a biological clock?
  • 2013 E.C., Q31 – This item is based on the table below. Biome Soil Animals Desert (hot) L M Tropical montane forest N O Select the correct representatives for L, M, N and 0, respectively
  • 2013 E.C., Q30 – The terrestrial biome characterized by cold temperature, dry precipitation, frozen soil and inhabited by migrating birds is
  • 2012 E.C., Q25 – What makes Ethiopia rich in biodiversity which deserves a global attention?
  • 2012 E.C., Q24 – In which biome are epiphytes common?
  • 2012 E.C., Q23 – By which level of precipitation, temperature and type of plants is the Tagia biome characterized, respectively
  • 2011 E.C., Q83 – What is the biome of the world where succulent plants are commonly found?
  • 2011 E.C., Q58 – If you were to travel from the Arctic Circle to the Equator, what sequence of biomes would you most likely pass through?
  • 2010 E.C., Q77 – Which of the following terms specifically refers to an ecological succession that starts in an aquatic environment?
  • 2009 E.C., Q37 – Which of the following biomes supports the highest diversity of plant and animal life?
  • 2009 E.C., Q97 – In which parts of Ethiopian are Lions, Elephants, & Giraffes found more community?
  • 2008 E.C., Q72 – In which biome are epiphytes typically present as a characteristics element ?
  • 2007 E.C., Q89 – Which of the following biomass of the earth has the greatest diversity of species?
  • 2007 E.C., Q37 – Which of the following is NOT the correct characteristics of tropical rainforests?
  • 2006 E.C., Q34 – In which one of the following ways the Tundra biome differs from desert biome?
  • 2006 E.C., Q66 – Which of the following applies to the tropical rainforest?
  • 2006 E.C., Q72 – Among the following which one has little or no contribution to the loss of biodiversity?
  • 2005 E.C., Q2 – One of the following biomes in Africa is supporting large wild mammals such as elephants, giraffes and lions.
  • 2005 E.C., Q19 – In which one of the following aspects is the tropical rain forest biome poor?
6.1.6 Ecological succession · read p. 155
  • 2013 E.C., Q38 – A previously bare land was gradually occupied by lichen and mosses, annual herbs, perennial herbs, shrubs and finally by forests. Which one of the following best describes the process indicated above?
  • 2012 E.C., Q30 – In the bare bottom of a newly formed pond a biologist observed emergence of new algae. The form of succession he observed can be best described as
  • 2010 E.C., Q61 – What major consequence dose primary ecological succession involve normally?
  • 2009 E.C., Q31 – Which of the following is a type of ecological succession that starts from a cleared forest area?
  • 2008 E.C., Q25 – Which of the following organisms usually forms the pioneer community in the primary biological succession?
  • 2006 E.C., Q89 – What is the ecological succession in which plant communities establish after an area has been completely demolished by fire?
6.2 Ecological relationships · read p. 157
  • 2015 E.C., Q18 – Which one of the following comparisons is true about primary and secondary successions? Secondary succession has
  • 2014 E.C., Q93 – Identify the correct statement about intra-specific competition? It is a
  • 2014 E.C., Q24 – A key aspect in the process of recovery of an ecosystem through succession is that
  • 2013 E.C., Q35 – A major factor in controlling the population size that helps to minimize predators and recover prey's number is
  • 2012 E.C., Q6 – A geographical area with specific climate, soil type, plants and animals with similar adaptation is
  • 2011 E.C., Q92 – The following statements are correct regarding ecological succession EXCEPT:
  • 2010 E.C., Q62 – How quickly a population would increase or decrease in size is probably least influenced by the presence of:
  • 2009 E.C., Q96 – The main factors that determine the types of terrestrial biomes in a certain geographical area are:
  • 2005 E.C., Q31 – Which of the following is NOT usually true as an ecological succession progresses to advanced seral stages ?
  • 2005 E.C., Q57 – What is the type of community called when it has reached the final and most complex stage of a succession
  • 2005 E.C., Q50 – What is the main reason fore the high species richness of pants and mammals observed in Ethiopia?