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Grade 9 Ecosystems (Mixed) Worksheet with Answers
Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Biology
Unit 4: EcologyEcosystems
A mixed set on the roles living things play in an ecosystem, biomes and symbiosis. 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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Practice Sheetaethelsystems.comEcosystems (Mixed)
Grade 9 · Biology
Name
Class
Date
Learning goal: Ecosystems
Directions: This worksheet has 2 parts. Read the instructions at the start of each part.
What is a large area with a distinct climate and organisms called, like a desert or rainforest?
Answer: a biome
RememberRelationships in an ecosystem
Match each clue to the right word. Write the letter in the box.
- 1What do we call an organism that breaks down dead material for nutrients?
- 2What do we call an animal that eats only plants?
- 3What do we call the living parts of an ecosystem?
- 4What do we call the specific role an organism plays in its habitat?
- 5A bird nests in a tree without harming it. What type of relationship is this?
- 6What is it called when one organism benefits and the other is harmed?
- ADecomposer
- BBiotic factors
- CCommensalism
- DHerbivore
- EIts niche
- FParasitism
Answer each question. Use full sentences where you can.
- 7
What is a secondary consumer?
- 8
What do we call all the members of one species living in one area?
- 9
What do we call a diagram showing many connected food chains in one ecosystem?
- 10
Why are there usually fewer top predators than herbivores in an ecosystem?
- 11
What would happen to an ecosystem without decomposers?
- 12
What is it called when organisms need the same limited resource, like food or space?
★ 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/ecosystems
Answer key — Ecosystems (Mixed) (Grade 9)
- 1.A — a decomposer
- 2.D — an herbivore
- 3.B — biotic factors
- 4.E — its niche
- 5.C — commensalism
- 6.F — parasitism
- 7.an animal that eats primary consumers
- 8.a population
- 9.a food web
- 10.energy is lost at each level, so less is available to support animals higher up
- 11.dead material would pile up and nutrients would not return to the soil
- 12.competition
- ★far enough to reach the Moon (about 440,000 km)
Answer key (click to show)
- 1.A — a decomposer
- 2.D — an herbivore
- 3.B — biotic factors
- 4.E — its niche
- 5.C — commensalism
- 6.F — parasitism
- 7.an animal that eats primary consumers
- 8.a population
- 9.a food web
- 10.energy is lost at each level, so less is available to support animals higher up
- 11.dead material would pile up and nutrients would not return to the soil
- 12.competition
- ★far enough to reach the Moon (about 440,000 km) (challenge corner)
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