MAKE IT YOURS

A world for every learner

Choose a grade to discover its colours and creative world.

Grade 9 Biomes & Symbiosis Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Biology

Unit 4: EcologyEcosystemsNGSS 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.

Save to PinterestJump to answer key
  • Answer keys checked by code
  • No ads, ever
  • No student accounts needed
  • Safety & privacy
Practice Sheetaethelsystems.com

Biomes & Symbiosis

Grade 9 · Biology

Score___ / 12

Name

Class

Date

Learning goal: Ecosystems · NGSS HS-LS2-6

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

Example

What do we call a community of living things and their environment?

Answer: an ecosystem

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 one organism benefits and the other is harmed?
  2. 2What do we call the specific role an organism plays in its habitat?
  3. 3What do we call the living parts of an ecosystem?
  4. 4What is a large area with a distinct climate and organisms called, like a desert or rainforest?
  5. 5What is it called when two organisms live closely together and both benefit?
  6. 6What do we call the non-living parts of an ecosystem, like water and sunlight?
  • ABiome
  • BMutualism
  • CBiotic factors
  • DAbiotic factors
  • EIts niche
  • FParasitism
Part B

Answer each question. Use full sentences where you can.

  1. 7

    Name two land biomes.

  2. 8

    Bees collect nectar and pollinate flowers. What type of relationship is this?

  3. 9

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

  4. 10

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

  5. 11

    Which biome is very cold, treeless and has frozen ground called permafrost?

  6. 12

    What is it called when one organism benefits and the other is unaffected?

★ Challenge corner for fast finishers

If you could fold a sheet of paper 42 times, roughly how thick would it be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/biology/9/ecosystem_relationships

Answer key (click to show)
  1. 1.F — parasitism
  2. 2.E — its niche
  3. 3.C — biotic factors
  4. 4.A — a biome
  5. 5.B — mutualism
  6. 6.D — abiotic factors
  7. 7.desert, rainforest, tundra, grassland, taiga or deciduous forest (any two)
  8. 8.mutualism
  9. 9.commensalism
  10. 10.a population
  11. 11.tundra
  12. 12.commensalism
  13. ★far enough to reach the Moon (about 440,000 km) (challenge corner)

Need another Biomes & Symbiosis worksheet?

Generate unlimited fresh versions at easy, medium or hard difficulty, each with its own answer key. Free during our launch — no card needed.

Create a free account

How to use this worksheet

  • Use it for revision before a test, as homework, or as a timed practice set.
  • Students can self-mark with the answer key and note which question types they got wrong.
  • Generate several versions of the same topic for spaced practice in the weeks before an exam.

Related worksheets

Biomes & Symbiosis in other Grade 9 courses

Grade 9 Science

Biomes & Symbiosis at other grades

Grade 12

More Grade 9 Biology worksheets

Grade 9 Producers, Consumers & DecomposersGrade 9 Ecosystems (Mixed)Grade 9 Population EcologyGrade 9 Cell BiologyGrade 9 BiomoleculesGrade 9 Cell Transport & HomeostasisGrade 9 DNA, RNA & Protein SynthesisGrade 9 Genetics Vocabulary

Can't find what you need? Tell us which worksheet to make next.

Frequently asked questions

Does this Grade 9 Biomes & Symbiosis worksheet come with answers?

Yes. The full answer key is on this page, and it prints on its own page after the questions. Every answer is calculated or checked by code rather than written by an AI model, so the key is always correct.

How do I print it or save it as a PDF?

Click "Download PDF" to save a ready-to-print PDF with the answer key on the last page, or click "Print" to send the worksheet and answer key straight to your printer.

Can I get a different Biomes & Symbiosis worksheet?

Yes. Create a free account to generate as many fresh Grade 9 Biomes & Symbiosis worksheets as you like, at easy, medium or hard difficulty, each with its own answer key.

Is this worksheet free?

Yes. This worksheet is free to print, and Practice Sheet is free to use during our launch with no card needed.