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OpenStem
@openstem · Joined Jul 2026
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Quiz5 questions
Which of these is NOT one of the skeleton's main jobs?
ASupporting the bodyBProtecting organsCDigesting foodDWorking with muscles to move
Biology · L2 · Bones and Muscles
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Biology · L2 · Bones and MusclesQuiz5 questions
Which part of the brain controls balance and coordination?
ACerebrumBCerebellumCBrain stemDSpinal cord
Biology · L2 · Brain and Nerves
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Biology · L2 · Brain and NervesQuiz5 questions
Which of these is an inherited trait?
APlaying the guitarBEye colourCSpeaking FrenchDRiding a skateboard
Biology · L2 · Traits and Heredity Quiz
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Biology · L2 · Traits and Heredity QuizQuiz5 questions
How many kingdoms do scientists sort living things into?
AThreeBFourCFiveDSeven
Biology · L2 · Classifying Living Things Quiz
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Biology · L2 · Classifying Living Things QuizQuiz5 questions
What is a microorganism?
AA living thing so small it can only be seen with a microscopeBAny organism found underwaterCA type of plant cellDA machine used to study cells
Biology · L2 · Bacteria, Viruses, and Fungi Quiz
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Biology · L2 · Bacteria, Viruses, and Fungi QuizQuiz5 questions
Which plant organ absorbs water and minerals from the soil?
ALeafBStemCRootDFlower
Biology · L2 · Plant Structures and Reproduction Quiz
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Biology · L2 · Plant Structures and Reproduction QuizQuiz5 questions
Which of these best describes an ecosystem?
AAll the members of one species living in the same areaBAll the different populations living and interacting in an areaCA community of living organisms together with the nonliving parts of their environmentDThe specific place where one organism lives
Biology · L2 · Ecosystems and Habitats Quiz
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Biology · L2 · Ecosystems and Habitats QuizQuiz5 questions
Which of these is an example of a physical adaptation?
AA bird migrating south for winterBA bear hibernating through winterCAn arctic fox's white furDWolves hunting together in a pack
Biology · L2 · Adaptation and Survival Quiz
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Biology · L2 · Adaptation and Survival QuizQuiz5 questions
Which life stage comes right after infancy?
AOlder adulthoodBChildhoodCAdulthoodDThe teenage years
Biology · L2 · Human Life Stages Quiz
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Biology · L2 · Human Life Stages QuizQuiz5 questions
Which of these are examples of germs that can make you sick?
ABacteria and virusesBRed blood cells and white blood cellsCSkin cells and muscle cellsDVaccines and antibodies
Biology · L2 · Germs and Your Immune System Quiz
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Biology · L2 · Germs and Your Immune System QuizQuiz5 questions
What is the main job of the retina?
ATo focus light onto the back of the eyeBTo control how much light enters the eyeCTo detect light and turn it into nerve signalsDTo carry visual signals to the brain
Biology · L2 · Sense Organs Quiz
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Biology · L2 · Sense Organs QuizQuiz5 questions
What is the kidneys' main job?
ADigest food and absorb nutrientsBFilter waste and extra water out of the bloodCPump blood around the bodyDProduce sweat to cool the body
Biology · L2 · Skin and Kidneys Quiz
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Biology · L2 · Skin and Kidneys QuizQuiz5 questions
What is a hormone?
AAn electrical signal sent along a nerveBA chemical messenger made by a gland and carried in the bloodCA type of white blood cellDA muscle that pumps blood around the body
Biology · L2 · Hormones and Glands Quiz
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Biology · L2 · Hormones and Glands QuizQuiz5 questions
What is puberty?
AA disease that only affects some childrenBThe stage of life when a child's body gradually matures into an adult bodyCA single day when the body suddenly becomes an adultDA stage that only happens to some people, not everyone
Biology · L2 · Growing Up and Reproduction Basics Quiz
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Biology · L2 · Growing Up and Reproduction Basics QuizQuiz5 questions
Why do most leaves appear green in spring and summer?
AChlorophyll is the only pigment leaves ever containBChlorophyll is so abundant it overpowers the other pigments presentCCarotenoids turn green when temperatures are warmDAnthocyanins are destroyed by sunlight
Biology · L2 · Leaf Pigments and Color Change Quiz
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Biology · L2 · Leaf Pigments and Color Change QuizQuiz5 questions
What does a honeybee's waggle dance communicate to other bees?
AThat danger is nearbyBThe direction and distance to a good patch of flowersCThat the hive needs a new queenDThat it is time to swarm to a new hive
Biology · L2 · How Animals Communicate Quiz
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Biology · L2 · How Animals Communicate QuizQuiz5 questions
Which nutrient group is your body's main source of energy?
ACarbohydratesBProteinCVitaminsDFiber
Biology · L2 · Food Groups and Nutrition Quiz
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Biology · L2 · Food Groups and Nutrition QuizQuiz5 questions
Which type of joint moves like a door swinging open and shut, in one direction only?
AHinge jointBBall-and-socket jointCPivot jointDFixed joint
Biology · L2 · Types of Joints Quiz
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Biology · L2 · Types of Joints QuizQuiz5 questions
What is the main purpose of a microscope?
ATo make sound louder so scientists can study animalsBTo magnify tiny objects so we can see details invisible to the naked eyeCTo measure the weight of a specimenDTo keep a specimen alive indefinitely
Biology · L2 · Microscopes and the Discovery of Cells Quiz
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Biology · L2 · Microscopes and the Discovery of Cells QuizQuiz5 questions
Which of these best describes herd immunity?
AA single vaccine that protects against every disease at onceBProtection for a whole community, including people who cannot be vaccinated, when enough people are immuneCA medicine that cures a disease after someone is already sickDA rule that requires everyone in a community to be vaccinated with no exceptions
Biology · L2 · Herd Immunity Quiz
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Biology · L2 · Herd Immunity QuizQuiz5 questions
What is transpiration?
AThe absorption of minerals by rootsBThe loss of water vapor from a plant, mostly through the stomataCThe production of sugar in leavesDThe transfer of pollen between flowers
Biology · L2 · Transpiration Quiz
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Biology · L2 · Transpiration QuizQuiz5 questions
Which feature defines the mollusk group?
AA hard exoskeleton with jointed legsBStinging cells used to capture preyCA soft body, often protected by a shellDA long, tube-shaped body with no legs
Biology · L2 · Invertebrate Diversity Quiz
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Biology · L2 · Invertebrate Diversity QuizQuiz5 questions
What shape is a DNA molecule?
AA flat sheetBA twisted ladder, called a double helixCA perfect circleDA single straight line
Biology · L2 · What Is DNA? Quiz
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Biology · L2 · What Is DNA? QuizQuiz5 questions
Which of these best describes the basic idea behind almost every food preservation method?
AAdding artificial preservative chemicals to the foodBChanging the food's environment so microbes cannot grow wellCMaking the food taste strongerDCooking the food until it changes color
Biology · L2 · Food Preservation Quiz
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Biology · L2 · Food Preservation QuizQuiz5 questions
Which of these best describes an animal's lifespan?
AThe time it takes to grow from birth to adulthoodBThe total time it is alive, from birth (or hatching) until deathCThe time it spends caring for its youngDHow quickly it can find food
Biology · L2 · Animal Lifespans Quiz
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Biology · L2 · Animal Lifespans QuizQuiz5 questions
Which word equation correctly describes cellular respiration?
ACarbon dioxide + water + sunlight → glucose + oxygenBGlucose + oxygen → carbon dioxide + water + energyCGlucose + carbon dioxide → oxygen + waterDWater + oxygen → glucose + energy
Biology · L2 · Cellular Respiration Quiz
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Biology · L2 · Cellular Respiration QuizQuiz5 questions
Why do many desert plants have thick, fleshy stems or leaves?
ATo store water for use during long dry periodsBTo attract pollinators with bright colorsCTo grow taller than nearby plantsDTo produce more seeds each year
Biology · L2 · How Desert Plants Store Water Quiz
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Biology · L2 · How Desert Plants Store Water QuizQuiz5 questions
In this example, which allele is dominant for flower color?
A"P", the purple alleleB"p", the white alleleCBoth alleles are equally dominantDNeither allele is dominant
Biology · L2 · A Gentle Introduction to Punnett Squares Quiz
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Biology · L2 · A Gentle Introduction to Punnett Squares QuizQuiz5 questions
Put these steps in the correct order to trace how oxygen gets from the air to your muscles.
ALungs take in oxygen → Blood picks up oxygen → Heart pumps blood → Muscles use oxygenBHeart pumps blood → Lungs take in oxygen → Muscles use oxygen → Blood picks up oxygenCMuscles use oxygen → Blood picks up oxygen → Heart pumps blood → Lungs take in oxygenDBlood picks up oxygen → Muscles use oxygen → Lungs take in oxygen → Heart pumps blood
Biology · L2 · Body Systems Working Together Quiz
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Biology · L2 · Body Systems Working Together QuizQuiz5 questions
What are the four stages of complete metamorphosis, in order?
AEgg, nymph, pupa, adultBEgg, larva, pupa, adultCLarva, egg, pupa, adultDEgg, larva, nymph, adult
Biology · L2 · Complete vs. Incomplete Metamorphosis Quiz
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Biology · L2 · Complete vs. Incomplete Metamorphosis Quiz