40 Science Riddles for Middle School With Answers
Science riddles for middle school turn biology, chemistry, physics, Earth science and space into short reasoning challenges. This collection includes 40 riddles with answers for grades 6–8, organized by subject so teachers and students can jump directly to the topic they need.
Jump to: Biology · Chemistry · Physics · Earth & Space
10 Biology Riddles for Middle School
- I contain genetic instructions and am shaped like a double helix. What am I?
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DNA.
- I control what enters and leaves a cell. What am I?
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The cell membrane.
- I am the organelle where most cellular respiration occurs. What am I?
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The mitochondrion.
- I contain chlorophyll and help plant cells capture light energy. What am I?
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A chloroplast.
- I carry oxygen in red blood cells. What protein am I?
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Hemoglobin.
- I am the process in which one cell divides into two genetically similar cells. What am I?
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Mitosis.
- I am the organ that filters blood and produces urine. What am I?
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A kidney.
- I am a relationship in which both organisms benefit. What am I?
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Mutualism.
- I am the green pigment involved in photosynthesis. What am I?
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Chlorophyll.
- I am the basic unit of life. What am I?
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A cell.
10 Chemistry Riddles for Middle School
- I am the smallest unit of an element that keeps its chemical identity. What am I?
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An atom.
- I have a positive charge and live in the nucleus. What am I?
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A proton.
- I have no electric charge and share the nucleus with protons. What am I?
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A neutron.
- I have a negative charge and occupy regions around the nucleus. What am I?
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An electron.
- I am made of two or more atoms chemically bonded together. What am I?
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A molecule.
- I have a pH below 7. What type of substance am I?
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An acid.
- I have a pH above 7. What type of substance am I?
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A base.
- I am a change that produces one or more new substances. What am I?
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A chemical reaction.
- I am the vertical column on the periodic table. What am I called?
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A group.
- I am H₂O. What common substance am I?
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Water.
10 Physics Riddles for Middle School
- I pull objects toward Earth. What force am I?
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Gravity.
- I resist motion when two surfaces rub against each other. What am I?
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Friction.
- I measure how fast distance changes with time. What am I?
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Speed.
- I am a change in velocity over time. What am I?
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Acceleration.
- I can travel through empty space and lets you see. What am I?
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Light.
- I need matter to travel through and can be heard by your ears. What am I?
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Sound.
- I am stored energy due to position. What am I?
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Potential energy.
- I am energy of motion. What am I?
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Kinetic energy.
- I am the push or pull that can change an object’s motion. What am I?
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Force.
- I am measured in newtons. What physical quantity am I?
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Force.
10 Earth and Space Riddles
- I am the solid outermost layer of Earth. What am I?
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The crust.
- I form when magma or lava cools and solidifies. What type of rock am I?
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Igneous rock.
- I form when existing rock changes because of heat and pressure. What type of rock am I?
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Metamorphic rock.
- I am the process by which rock is broken into smaller pieces at Earth’s surface. What am I?
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Weathering.
- I am the star at the center of our solar system. What am I?
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The Sun.
- I am Earth’s natural satellite. What am I?
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The Moon.
- I am the path one object follows around another in space. What am I?
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An orbit.
- I am a rocky object orbiting the Sun, smaller than a planet, and many of my kind lie between Mars and Jupiter. What am I?
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An asteroid.
- I am frozen water falling from clouds in crystals or flakes. What am I?
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Snow.
- I describe the long-term pattern of weather in a region. What am I?
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Climate.
How to Use These Science Riddles
- Use one as a lesson opener.
- Let teams explain why an answer is correct.
- Use subject sections for quick review before a quiz.
- Ask students to write a new riddle using the same science concept.
For more grade-level practice, explore our middle school riddles, middle school math riddles, science riddles and riddles for teachers.
FAQs About Middle School Science Riddles
What subjects are included?
Biology, chemistry, physics, Earth science and space topics are included.
Are the answers included?
Yes. All 40 riddles include direct answers.
Are these suitable for grades 6–8?
Yes. The concepts are written for a general middle school level, though exact curriculum timing varies by school.
Conclusion
These 40 science riddles for middle school give students short, answerable challenges across the major science areas while keeping the focus on reasoning and recall.
