What process turns kitchen scraps and yard waste into compost?
A Mineral weathering
B Aerobic biological decomposition
C Plastic breakdown
D Chemical sterilization
Answer: B. Aerobic biological decomposition. Composting uses microorganisms and oxygen to decompose organic material.
Which organisms do most of the decomposition in a compost pile?
A Birds and reptiles
B Garden plants
C Mature tree roots
D Microorganisms
Answer: D. Microorganisms. Bacteria and other microorganisms break down organic matter in the pile.
How is finished compost best classified for garden use?
A Biologically stable soil amendment
B Complete potting soil
C Synthetic fertilizer
D Weed-control chemical
Answer: A. Biologically stable soil amendment. Finished compost is a stable soil amendment that can improve soil health.
Dry leaves are usually grouped into which compost category?
A Greens
B Minerals
C Browns
D Kitchen waste
Answer: C. Browns. Dry leaves are carbon-rich materials, commonly called browns.
Fresh fruit and vegetable scraps count as what in a backyard pile?
A Browns
B Inert materials
C Greens
D Mineral additives
Answer: C. Greens. Fresh food scraps supply nitrogen and are classified as greens.
Why are both brown and green materials added?
A Balance carbon and nitrogen
B Sterilize the pile
C Repel all insects
D Eliminate watering
Answer: A. Balance carbon and nitrogen. Browns supply carbon while greens supply nitrogen for decomposers.
What role does oxygen play in aerobic composting?
A Replaces organic matter
B Cools every pile
C Prevents all odors
D Supports aerobic decomposers
Answer: D. Supports aerobic decomposers. Oxygen allows aerobic microorganisms to break down materials.
How should a properly moist compost pile feel?
A Dry powder
B Wrung-out sponge
C Standing water
D Sticky clay
Answer: B. Wrung-out sponge. A wrung-out-sponge consistency indicates adequate moisture without waterlogging.
Why chop bulky food scraps before adding them?
A Increase surface area
B Remove their nitrogen
C Make them waterproof
D Sterilize the pieces
Answer: A. Increase surface area. Smaller pieces expose more surface area to microbes and often decompose faster.
After adding food scraps, what helps deter rodents?
A Leave them exposed
B Add cooking oil
C Place them beside fences
D Cover them with browns
Answer: D. Cover them with browns. Covering food scraps with browns helps reduce odors and pest access.
Which material is a reliable carbon-rich brown?
A Fresh grass clippings
B Dry leaves
C Coffee grounds
D Vegetable peels
Answer: B. Dry leaves. Dry leaves are a common carbon-rich compost ingredient.
Which fresh yard material is typically nitrogen-rich?
A Dry twigs
B Shredded cardboard
C Fresh grass clippings
D Wood chips
Answer: C. Fresh grass clippings. Fresh grass clippings are greens that provide nitrogen.
What kind of cardboard is suitable as a brown ingredient?
A Wax-coated packaging
B Plastic-lined cartons
C Glossy gift boxes
D Shredded uncoated cardboard
Answer: D. Shredded uncoated cardboard. Uncoated cardboard can be shredded and used as a carbon-rich brown.
Why can a bulky twig layer help at the pile’s base?
A Improves airflow and drainage
B Adds kitchen nitrogen
C Sterilizes the soil
D Blocks all worms
Answer: A. Improves airflow and drainage. A coarse base layer can let air circulate and help excess liquid drain.
Which site is most practical for a backyard compost pile?
A Sealed concrete room
B Low, flooded hollow
C Accessible, well-drained spot
D Hidden roof corner
Answer: C. Accessible, well-drained spot. Choose a convenient location with good drainage and access to water.
Where does Illinois Extension recommend starting an outdoor pile?
A On a plastic sheet
B On bare ground
C On a paved driveway
D Inside a water-tight tub
Answer: B. On bare ground. Starting on bare ground gives the pile contact with soil and organisms.
What is one reason for soil contact beneath an outdoor pile?
A Adds synthetic nutrients
B Prevents decomposition
C Keeps the pile dry
D Connects pile with soil microbes
Answer: D. Connects pile with soil microbes. Bare-ground contact can connect the pile with soil organisms.
Which approach describes layering browns and greens in sequence?
A Lasagna-style layering
B Random burial
C Single-material packing
D Daily soil sealing
Answer: A. Lasagna-style layering. Layering in repeated bands is often compared with making lasagna.
Turning an active compost pile mainly improves what?
A Sun exposure
B Nitrogen removal
C Aeration
D Seed production
Answer: C. Aeration. Turning mixes materials and brings oxygen into the pile.
When a pile smells rotten and feels soggy, what should be tried?
A Add more water
B Add dry browns and turn
C Seal it tightly
D Add more food scraps
Answer: B. Add dry browns and turn. A wet, poorly aerated pile can smell bad; add dry browns and turn it.
Materials are dry and decomposition has slowed; what adjustment helps?
A Add glossy paper
B Moisten the pile
C Remove all browns
D Seal every air gap
Answer: B. Moisten the pile. Dry compost can slow or stop microbial activity; add water and mix.
How can preparing coarse ingredients help the pile?
A Reduce carbon completely
B Prevent all heat
C Speed decomposition
D Replace oxygen
Answer: C. Speed decomposition. Chopping or shredding increases exposed surface area and can speed breakdown.
When an active pile is not heating, which adjustment may help?
A Mix in greens and turn
B Add only dry leaves
C Remove green materials
D Pour in cooking oil
Answer: A. Mix in greens and turn. EPA guidance suggests mixing in greens and turning when an active pile is not heating.
Why are meat, fish, and bones usually excluded from backyard piles?
A Remove all carbon
B Stop water absorption
C Kill every microbe
D They can attract animals
Answer: D. They can attract animals. These foods can attract animals and may not break down fully in typical backyard piles.
What problem can dairy products cause in a backyard compost pile?
A Excess airflow
B Rapid leaf growth
C Odors and pests
D Low sunlight
Answer: C. Odors and pests. Dairy can create odor problems and attract pests in home piles.
Why should dog or cat waste stay out of ordinary garden compost?
A It lacks all nitrogen
B It may contain harmful pathogens
C It is always too dry
D It blocks sunlight
Answer: B. It may contain harmful pathogens. Pet waste can contain pathogens that may be harmful to people.
Why avoid composting diseased or pest-infested plants at home?
A They contain no organic matter
B They cool nearby soil
C They attract pollinators
D Problems may survive and spread
Answer: D. Problems may survive and spread. Plant diseases or pests may survive a backyard pile and return to the garden.
What is the concern with weeds carrying mature seeds?
A Seeds may survive composting
B They are too carbon-rich
C They use too much water
D They improve pile airflow
Answer: A. Seeds may survive composting. Backyard piles may not reliably destroy aggressive weed seeds.
Which grass clippings should be kept out of a home pile?
A Fresh untreated clippings
B Partly dried clippings
C Herbicide-treated clippings
D Chopped grass clippings
Answer: C. Herbicide-treated clippings. Herbicide-treated plant material can contaminate compost or harm sensitive plants.
Why is glossy paper generally unsuitable for a backyard pile?
A It adds excess moisture
B It supplies excess nitrogen
C It guarantees pests
D Coatings may not compost well
Answer: D. Coatings may not compost well. Glossy coatings and inks make this paper a poor choice for a home pile.
How can eggshells be prepared for a compost pile?
A Leave them whole
B Crush them first
C Mix them with grease
D Coat them in plastic
Answer: B. Crush them first. Crushed eggshells are acceptable and break down more readily than large pieces.
Coffee grounds generally contribute which nutrient-rich category?
A Greens
B Browns only
C Minerals only
D Inert matter
Answer: A. Greens. Coffee grounds are commonly treated as nitrogen-rich greens.
Untreated wood chips are most often considered what?
A Greens
B Food scraps
C Finished compost
D Browns
Answer: D. Browns. Untreated wood chips are carbon-rich browns.
Why check before placing compostable packaging in a backyard bin?
A It decomposes instantly
B It supplies oxygen
C Backyard heat may be insufficient
D Every package is accepted
Answer: C. Backyard heat may be insufficient. Many compostable service items need commercial conditions; check local facility rules.
In EPA home-pile guidance, how many parts browns are suggested per green part?
A Two to three parts
B One half part
C One part exactly
D Ten parts
Answer: A. Two to three parts. EPA advises adding at least two to three volumes of browns for each volume of greens.
What is vermicomposting?
A Composting without organic matter
B Using worms to compost
C Using only garden soil
D Heating scraps in an oven
Answer: B. Using worms to compost. Vermicomposting uses suitable worms to process organic scraps.
Which worms are commonly used in indoor worm bins?
A Earthworms from lawns
B Fishing nightcrawlers
C Red wigglers
D Pond leeches
Answer: C. Red wigglers. Red wigglers are commonly used for vermicomposting.
What makes suitable bedding for a worm bin?
A Moist shredded newspaper
B Dry glossy catalogs
C Oily cardboard pieces
D Plastic packing foam
Answer: A. Moist shredded newspaper. Moist, shredded, non-glossy paper or cardboard can serve as worm bedding.
When adding food scraps to a worm bin, what should cover them?
A A layer of grease
B A thick plastic sheet
C Garden fertilizer
D Moist bedding
Answer: D. Moist bedding. Covering scraps with bedding helps control odors and pests.
Why wait before adding more food to a worm bin?
A Worms need no food
B Earlier scraps should be eaten
C Scraps must stay uncovered
D Bedding should become dry
Answer: B. Earlier scraps should be eaten. Wait until the worms have eaten the earlier food before adding more.
Which food is best kept out of a basic worm bin?
A Citrus scraps
B Chopped vegetables
C Coffee grounds
D Crushed eggshells
Answer: A. Citrus scraps. EPA guidance recommends avoiding citrus in a basic vermicomposting bin.
Which appearance suggests compost is finished?
A Bright green and wet
B White and powdery
C Dark, loose, and crumbly
D Sticky with whole scraps
Answer: C. Dark, loose, and crumbly. Finished compost is generally dark, loose, and crumbly.
What smell is typical of mature compost?
A Sharp ammonia
B Fresh soil
C Rotten eggs
D Burnt plastic
Answer: B. Fresh soil. Finished compost should smell earthy, like fresh soil.
After a pile stops heating and scraps disappear, what stage comes next?
A Adding meat
B Sealing out all air
C Digging it into seedlings
D Curing
Answer: D. Curing. Allowing compost to cure lets the material finish stabilizing.
Why screen finished compost before use?
A Remove larger undecomposed pieces
B Add more nitrogen
C Make it heat again
D Remove all microbes
Answer: A. Remove larger undecomposed pieces. Screening can separate twigs, pits, and other pieces that did not break down.
How should gardeners think of compost in planting mixes?
A Complete fertilizer substitute
B A pesticide
C A soil amendment
D A seed-starting guarantee
Answer: C. A soil amendment. Compost improves soil but is not a guaranteed complete fertilizer or universal potting medium.
Where can finished compost be applied?
A Only inside worm bins
B Only beneath trees
C Only on paved paths
D Garden beds and containers
Answer: D. Garden beds and containers. Compost can be used in flower and vegetable beds, window boxes, and containers.
What should be done with dehydrated kitchen scraps before treating them as compost?
A Use as finished soil immediately
B Send them for further composting
C Store them with plastics
D Spread them as mulch
Answer: B. Send them for further composting. A household dehydrator output is not finished compost; it needs further processing.
Who determines which materials a local compost collection accepts?
A The packaging color
B The home gardener alone
C The local program or facility
D The garden center cashier
Answer: C. The local program or facility. Accepted feedstocks differ between facilities, so check local program guidance.
How does composting food scraps help manage household waste?
A Turns plastic into soil
B Prevents every landfill odor
C Replaces all recycling
D Diverts organics from disposal
Answer: D. Diverts organics from disposal. Home composting can divert food scraps and yard trimmings from the waste stream.