Ecosystem Word Search Puzzle With Food Webs, Biomes and an Answer Key

Hunt the ecology vocabulary the day the class draws its first food web; New puzzle deals a fresh grid.

Name Date

Ecosystem Word Search

Find every word hidden in the grid. Words go across and down.

0 of 16 words found

BRGIHBRDANFCSOG

ILNECTNELOMSCSF

OSICDNICHEWXEWI

DYTRPQSOESEAEAR

IMNCILSMREACRUI

VBLAOCPPBALPAFS

EIUOORROIRSOMIM

ROBIOMESVYPPUEH

SSRSOEYEOOEUTZA

IIEAARLRRBCLUVB

TSCAVENGERIAACI

YECARNIVORETLTT

ADAPTATIONSIIVA

FBCOMMUNITYOSST

PARASITISMYNMIV

This grid is wider and taller than its box. Slide it to see every letter.To drag, hold the first letter for a moment, then slide.Keyboard: Tab to the grid, arrow keys to move, Enter on the first and last letter.

DecomposerDECOMPOSER
HerbivoreHERBIVORE
CarnivoreCARNIVORE
ScavengerSCAVENGER
PreyPREY
SymbiosisSYMBIOSIS
MutualismMUTUALISM
ParasitismPARASITISM
NicheNICHE
AdaptationADAPTATION
BiomeBIOME
HabitatHABITAT
PopulationPOPULATION
CommunityCOMMUNITY
SpeciesSPECIES
BiodiversityBIODIVERSITY

16 of 24 words from the Ecosystem Key Terms list.

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Easy: words go across and down.

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Show clues, not words

Word list

Large print Lower-case letters Name and date line on paper

The puzzle changes as you go. See the puzzle

Answer key: Ecosystem Word Search

BRGIHBRDANFCSOG

ILNECTNELOMSCSF

OSICDNICHEWXEWI

DYTRPQSOESEAEAR

IMNCILSMREACRUI

VBLAOCPPBALPAFS

EIUOORROIRSOMIM

ROBIOMESVYPPUEH

SSRSOEYEOOEUTZA

IIEAARLRRBCLUVB

TSCAVENGERIAACI

YECARNIVORETLTT

ADAPTATIONSIIVA

FBCOMMUNITYOSST

PARASITISMYNMIV

DECOMPOSER, HERBIVORE, CARNIVORE, SCAVENGER, PREY, SYMBIOSIS, MUTUALISM, PARASITISM, NICHE, ADAPTATION, BIOME, HABITAT, POPULATION, COMMUNITY, SPECIES, BIODIVERSITY

Next step Run a spelling test on Symbiosis and Mutualism Build a puzzle from your own unit's word list

All 132 words

Food Chains and Food Webs 26

Algae Simple photosynthetic life, from single cells to giant seaweeds. Producers of ponds and seas.
Apex predator A hunter at the very top of its chain, such as a killer whale, with few or no natural enemies.
Autotroph The science name for a producer: an organism that needs no living source of carbon or energy.
Biomass The total mass of living things in a given area at a given time.
Carnivore A meat eater. It gets its energy from animal tissue, by hunting or by scavenging.
Consumer A living thing that gets its energy by eating other living things.
Decomposer A living thing, such as a fungus or a bacterium, that breaks down the dead and frees nutrients.
Detritivore An animal that eats bits of dead plants and animals. Millipedes, woodlice and slugs do.
Energy pyramid A diagram with producers along the wide bottom and each higher feeding step stacked above.
Food chain A single line of what eats what, from a plant at the start to a top hunter at the end.
Food web Every feeding link in a community drawn as one diagram of what eats what, many chains crossing.

Show all 132 words (121 more)

Food Chains and Food Webs, continued

Fungi Mushrooms, molds and yeasts, the principal decomposers in most ecosystems.
Grass The plant family that covers prairies and savannas. Often the first link in a land chain.
Hawk A bird of prey of the daytime. Like most raptors, it kills with its talons.
Herbivore An animal built to feed mainly on plants: leaves, fruits or seeds.
Heterotroph A living thing that has to eat others for food. The Greek parts mean other and nourishment.
Kelp A large brown seaweed. Thick stands of it form underwater forests on cool coasts.
Krill Small crustaceans found in all the oceans, the main food of baleen whales.
Omnivore An eater of both plants and animals. Bears, raccoons and pigs are examples.
Owl A mostly nocturnal bird of prey with silent flight that hunts small mammals and insects.
Phytoplankton Drifting microscopic producers of seas and lakes. They make half or more of the oxygen supply.
Producer A living thing that makes its own food, as green plants on land and algae in water do.
Scavenger An animal that feeds on dead and decaying matter, as a vulture feeds on carrion.
Sunlight The energy that producers capture in photosynthesis, at the start of nearly every chain.
Trophic level A position in a chain of what eats what. Plants sit at number 1 and plant eaters at number 2.
Zooplankton Drifting animals of seas and lakes. The name means animal drifter in Greek.

Predators, Prey and Partnerships 23

Adaptation A trait with a useful function for the organism, kept and shaped by natural selection.
Bee An insect best known as a pollinator. It lives on all continents but Antarctica.
Camouflage Coloring or shape that makes an animal hard to see, or disguises it as something else.
Commensalism A relationship in which one species gains while the other is neither helped nor harmed.
Competition What happens when living things need the same resource, such as food or water, in short supply.
Coral A tiny sea animal that lives in colonies. Algae inside its tissues supply most of its energy.
Deer A hoofed mammal that chews the cud. Males of almost all kinds grow and shed antlers each year.
Hibernation A deep winter rest in which an animal's body cools and its breathing and heartbeat slow.
Host The larger organism that harbors a smaller guest, giving it food and shelter.
Keystone ___ species: one with a very large effect for its numbers. Named in 1969 after studies of starfish.
Migration A long-distance journey made by animals, usually on a seasonal basis.
Mimicry An evolved likeness to another species, as a harmless hoverfly looks like a wasp.
Mutualism A relationship in which each species gains, as when a bee feeds and the flower is pollinated.
Niche The role a species plays in its community, including the resources it uses.
Parasite An organism, such as a tapeworm, flea or louse, that lives on or in a host and harms it.
Parasitism A relationship in which one species lives on or inside another and causes it some harm.
Pollination Moving pollen from anther to stigma, often by bee or wind, so that a plant can make seeds.
Pollinator An animal, such as a bee, a bat or a hummingbird, that moves pollen between flowers.
Predator An animal that kills and eats other animals.
Prey An animal that is hunted, killed and eaten by another.
Symbiosis A close, long-lasting partnership between living things of two different species.
Territory An area an animal regularly defends from others of its own species.
Wolf The largest wild member of the dog family. It travels in a family of parents and offspring.

Biomes of the World 25

Biome A large region with its own climate, plants and animal life, such as tundra or desert.
Bog A wetland that builds up peat, a deposit of dead plants, often sphagnum moss.
Canopy The upper layer of a forest, formed by the crowns of mature trees.
Chaparral Shrubland found mainly in California, where winters are mild and wet and summers hot and dry.
Conifer A tree or shrub that bears cones. Most kinds are evergreen with needle-shaped leaves.
Coral reef A ridge built by colonies of polyps. Under 0.1% of the ocean, yet home to 25% of sea species.
Deciduous Describes trees and shrubs that shed their leaves each year, usually in the autumn.
Desert A dry landscape where very little rain or snow falls. About one third of all land is this dry.
Estuary A partly enclosed coastal water where fresh river water meets and mixes with the salty sea.
Grassland Land where grasses dominate. It occurs naturally on every continent except Antarctica.
Kelp forest An underwater area thick with large brown seaweed, found along temperate and polar coasts.
Mangrove A tree or shrub at home in salty coastal water. Some kinds prop themselves up on stilt roots.
Marsh A wetland of grasses, rushes or reeds instead of woody plants.
Moss A small flowerless plant that forms green mats in damp, shady places, anchored by threads.
Permafrost Ground that has stayed frozen for at least two years in a row.
Pond A small, still body of water, smaller than a lake. No official rule separates the two.
Prairie The temperate grassland of North America, once roamed by bison, elk and white-tailed deer.
Rainforest A wet forest with a closed, continuous canopy, vines and plants that grow on other plants.
Savanna A mix of grassland and widely spaced trees, so that the canopy never closes.
Swamp A wetland with trees: a forested one, unlike a marsh.
Taiga The cold northern forest of conifers such as spruce and pine. The largest land biome of all.
Tide pool A shallow hollow of seawater left on a rocky shore when the sea goes out.
Tundra A biome where cold and a short growing season keep trees from growing.
Understory The plants growing beneath the upper layer of a forest but above the floor. Most tolerate shade.
Wetland Land that is flooded or soaked with water, either all the time or only in some seasons.

Habitats and Nonliving Factors 18

Abiotic Describes the non-living parts of an ecosystem, such as water, light, temperature and minerals.
Burrow A hole or tunnel an animal digs for a home or a hiding place. A rabbit warren is one.
Climate The pattern of heat, cold, rain and dry that a region gets year after year. It shapes the biome.
Den A cave or hollow where a wild animal shelters or goes into hiding. Another word for a lair.
Habitat The place, with its array of resources, that supports the survival of a particular species.
Humus The stable, brown to black part of soil that comes from decomposed plants and animals.
Leaf litter Dead foliage, twigs, bark and needles lying on top of the soil. Many decomposers live in it.
Nest A structure built by an animal to hold its eggs or young. Birds are the best-known builders.
Nutrient A substance a living thing takes in to stay alive, grow and make young.
Oxygen The gas, about 21 percent of dry air, that photosynthesis releases and respiration uses.
Rainfall Water that condenses in the air and falls as droplets. An abiotic factor of every land biome.
Range The geographic limits within which a species is found, often shaded on a map.
Resource A substance or object in the environment that an organism requires to grow and reproduce.
Salinity The saltiness of water. Seawater typically holds about 35 grams of salt per kilogram.
Shelter Cover from the weather and from enemies, which a burrow, a nest or a den provides.
Snag A dead or dying tree still standing, often without its top. Woodpeckers dig their holes in it.
Soil The loose top layer of land: bits of rock, rotted matter, air, water and tiny life.
Temperature How hot or cold it is. An abiotic factor that helps decide where a species can live.

Water, Carbon and Nitrogen Cycles 18

Aquifer A layer of rock, gravel or sand below ground that holds water. Wells draw from it.
Carbon cycle The exchange of element 6 among living things, soil, rocks, oceans and the atmosphere.
Compost Rotted garden and kitchen scraps, dug into soil to feed it.
Decomposition The rotting of dead matter into simple things such as carbon dioxide, water and mineral salts.
Detritus Dead and decaying organic material, such as the rotting leaves in a stream.
Evaporation The change of a liquid into gas at its surface. The ocean is the source of most of it.
Fixation Nitrogen ___: the change of the gas in air into a form plants can use, by bacteria or lightning.
Fossil fuel Coal, oil or natural gas, formed over millions of years from buried ancient life.
Groundwater The supply held beneath the surface in the pore spaces of soil and the fractures of rock.
Legume A plant of the pea family. Bacteria in its root nodules fix nitrogen from the air.
Nitrogen The gas that makes up 78 percent of dry air. It must be fixed before plants can take it up.
Photosynthesis How plants, algae and some bacteria turn light energy into chemical energy, releasing oxygen.
Precipitation Water falling from clouds in any form: drizzle, rain, snow, ice pellets or hail.
Respiration The process in cells that transfers chemical energy from food and releases waste products.
Runoff Water flowing over the ground surface because it cannot soak into the soil fast enough.
Transpiration The loss of water vapor from a plant, mostly through tiny pores in its leaves.
Water cycle The continuous change of H2O between ocean, air and land. The ocean supplies 86% of evaporation.
Watershed In North America, the whole area of land that drains to one river mouth, lake or ocean.

Populations, Communities and Change 22

Biodiversity The variety of life in a place or on Earth, counted in genes, in species and in ecosystems.
Biosphere All the parts of Earth where life exists, from deep sea to mountain top, taken together.
Biotic Describes the living parts of an ecosystem, such as plants, animals, fungi and bacteria.
Capacity Carrying ___: the largest population of a species that a place can sustain with its resources.
Community All the populations of different species that occupy the same area at the same time.
Conservation The work of protecting species, their homes and whole ecosystems from being lost.
Disturbance An event such as a fire, flood, storm or insect outbreak that disrupts an ecosystem.
Drought A long dry spell with much less rain than usual. It can last months or years.
Ecology The science of how living things relate to each other and their environment. Named in 1866.
Ecosystem All the organisms of a place plus the non-living surroundings they interact with. A 1935 word.
Endangered Describes a species so reduced in number that it may soon die out altogether.
Extinction The end of a species, complete when its very last member dies.
Habitat loss What happens when a natural home can no longer support its species. The top cause of extinction.
Invasive Describes a brought-in species that harms its new home.
Lichen A partnership of a fungus with an alga or a cyanobacterium, living as one body.
Limiting factor Anything that restricts the growth of a population, often by running out.
Native Describes a species that is in a region through natural processes alone, not brought by people.
Pioneer ___ species: the first hardy organisms to colonize barren ground, such as lichens on bare rock.
Population Individuals of one species living in a particular place at a particular time.
Species A group of living things able to breed together and have young that can breed in turn.
Succession The process of change in a community over time, as after a fire or on newly formed land.
Wildfire An unplanned, uncontrolled fire in vegetation. Its heat melts the resin that seals some cones.

How this list was compiled: Own work: the word list and every clue were written for this page. The facts in the clues were checked on 2026-09-19 against Wikipedia, among them the articles on ecosystems (https://en.wikipedia.org/wiki/Ecosystem), food webs (https://en.wikipedia.org/wiki/Food_web) and biomes (https://en.wikipedia.org/wiki/Biome). Some clues were reworded on 2026-09-20, and any fact that changed was checked against Wikipedia the same day. Licence: own work

How it works

This ecosystem word search puzzle opens on 16 of 24 key terms, Producer, Decomposer and Habitat among them. Eight more lists, from Food Chains and Food Webs to Biomes of the World, bring the total to 132 words.

Read the full guide

A food chain word search, then the rest of the unit

For a food chain word search, pick Food Chains and Food Webs in the Start from a list row under the puzzle: 26 words, from Producer and Consumer to Apex predator. Predators, Prey and Partnerships (23) and Habitats and Nonliving Factors (18) suit the next lessons. Biomes of the World (25) runs from Tundra to Coral reef. Water, Carbon and Nitrogen Cycles (18) and Populations, Communities and Change (22) close the unit.

Two reading levels, one sheet size

Easy Ecosystem holds 27 words of 3 to 5 letters, Owl and Moss among them. Hard Ecosystem holds 58 of 9 to 14 letters: press Hard, and the grid grows when a word needs room. Either prints on 2 pages, Letter or A4, answer key second.

Biotic and Abiotic sit in separate lists, because BIOTIC reads inside ABIOTIC and a grid with both would hide one.
Fourteen entries are two words, such as Food web and Coral reef. Each is hidden closed up: FOODWEB.

Questions and answers

What is the difference between a food chain and a food web?

A food chain is a single line of what eats what, from a plant to a top hunter. A food web draws every feeding link in a community, many chains crossing. Both terms are in Food Chains and Food Webs.

What is a keystone species?

A species with a very large effect for its numbers. The idea was named in 1969 after studies of starfish. Keystone is in Predators, Prey and Partnerships, beside Wolf and Coral.

Can pupils solve the ecosystem word search puzzle from definitions?

Yes. Tick Show clues, not words, in More options. Niche then reads "The role a species plays in its community, including the resources it uses." Sixteen clues can run past one sheet, so check the print preview.

All 132 words

Food Chains and Food Webs 26

Food Chains and Food Webs, continued

Predators, Prey and Partnerships 23

Biomes of the World 25

Habitats and Nonliving Factors 18

Water, Carbon and Nitrogen Cycles 18

Populations, Communities and Change 22

How it works

A food chain word search, then the rest of the unit

Two reading levels, one sheet size

Questions and answers

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