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Grade 12 Biomes & Symbiosis Worksheet with Answers

Grade 12 (US) · Year 13 (UK) · Class 12 (India) · Biology

Unit 3: Ecology & Human ImpactPopulations & EcosystemsNGSS HS-LS2-6

Biomes and the relationships between species: mutualism, commensalism, parasitism and predation. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Biomes & Symbiosis

Grade 12 · Biology

Score___ / 12

Name

Class

Date

Learning goal: Populations & Ecosystems · NGSS HS-LS2-6

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

RememberRelationships in an ecosystem

Mutualism + / +both benefitbee and flowerCommensalism + / 0one benefits, other unaffectedbarnacle on a whaleParasitism + / −one benefits, one harmedtick on a dogPredation + / −one eats the otherowl and mouseCompetition − / −both want the same thinglions and hyenasProducer → consumerenergy flows upfood chains and webs
Part A

Match each clue to the right word. Write the letter in the box.

  1. 1What is it called when two organisms live closely together and both benefit?
  2. 2What is it called when one organism benefits and the other is unaffected?
  3. 3What do we call all the populations of different species living in one area?
  4. 4What do we call the non-living parts of an ecosystem, like water and sunlight?
  5. 5What do we call a community of living things and their environment?
  6. 6What is it called when one organism benefits and the other is harmed?
  • AMutualism
  • BCommensalism
  • CAbiotic factors
  • DEcosystem
  • ECommunity
  • FParasitism
Part B

Answer each question. Use full sentences where you can.

  1. 7

    A bird nests in a tree without harming it. What type of relationship is this?

  2. 8

    Name two land biomes.

  3. 9

    What do we call the living parts of an ecosystem?

  4. 10

    What do we call all the members of one species living in one area?

  5. 11

    What is a large area with a distinct climate and organisms called, like a desert or rainforest?

  6. 12

    What do we call the specific role an organism plays in its habitat?

★ Challenge corner for fast finishers

Why do you see lightning before you hear thunder?

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Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/12/ecosystem_relationships

Answer key (click to show)
  1. 1.A — mutualism
  2. 2.B — commensalism
  3. 3.E — a community
  4. 4.C — abiotic factors
  5. 5.D — an ecosystem
  6. 6.F — parasitism
  7. 7.commensalism
  8. 8.desert, rainforest, tundra, grassland, taiga or deciduous forest (any two)
  9. 9.biotic factors
  10. 10.a population
  11. 11.a biome
  12. 12.its niche
  13. ★light travels much faster than sound (challenge corner)

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