7th Grade Trivia
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99 free 7th Grade trivia questions with answers — trivia quiz, new questions added Sep 2026.
These 68 seventh grade trivia questions follow what most 7th graders in the United States actually study. Life science brings cells and organelles, Mendel's peas, DNA, blood, bones and the kingdoms of living things, with earth science on tides, rock types and the planet's core. Math sticks to the pre-algebra year: percent, ratios, probability, negative numbers, angles, median and the area of a circle. History covers the medieval and early modern world, from Charlemagne, the Crusades and the Black Death to samurai Japan, Mansa Musa, the Inca and Aztecs, Gutenberg and the Reformation, plus the Alamo for the Texas history crowd. Geography, grammar, figures of speech and the reading list, including The Outsiders, Roll of Thunder, Hear My Cry and A Wrinkle in Time, round it out. Every question is multiple choice and written so a 12- or 13-year-old who has been paying attention can get it, with a handful of harder ones to sort out the top of the class. Use it for a bell-ringer, a review game before a test, a family quiz night with a middle schooler at the table, or to find out how much of seventh grade you still remember. Answers were checked against encyclopaedia and primary sources before publishing, and each question shows its explanation and citation once you answer.
30 of 99 questions with answers and explanations. Play the quiz
Q 01Which organelle is nicknamed the "powerhouse of the cell"?
Mitochondrion
The mitochondrion has its own DNA, a leftover of its likely origin as a free-living bacterium that an ancient cell engulfed.
Q 02Along with water and light, what do plants need to make their own food through photosynthesis?
Carbon dioxide
Plants combine carbon dioxide from the air with water, using light energy, to make glucose, and release the oxygen we breathe as a by-product.
Q 03Gregor Mendel worked out the basic rules of inheritance by breeding which plant?
Peas
Peas made Mendel famous only after his death: his results were largely ignored until other scientists rediscovered them in 1900.
Q 04What is the basic unit of heredity called?
Gene
A gene typically comes in two copies, one inherited from each parent, so every child carries a mix of both parents' versions.
Q 05Which part of the blood carries most of the oxygen from the lungs to the rest of the body?
Red cells
Red cells are packed with oxygen-carrying hemoglobin, and in mammals they shed their nucleus as they mature, leaving more room for it.
Q 06What is the largest organ of the human body?
Skin
Skin is the largest organ, and one of its jobs is making vitamin D when it is exposed to sunlight.
Q 07Mushrooms, yeasts and molds all belong to which biological kingdom?
Fungi
Fungi are more closely related to animals than to plants, placed with them on the same branch of the tree of life.
Q 08A caterpillar turns into a butterfly through a process called what?
Metamorphosis
Metamorphosis inside a chrysalis starts with the caterpillar digesting itself, while surviving clusters of cells called imaginal discs build the adult wings, legs and eyes.
Q 09Which structure do plant cells have that animal cells lack, giving them their rigid shape?
Cell wall
The cell wall holds back water pressure inside a plant cell, and that pressure keeps a well-watered plant firm; when it drops, the plant wilts.
Q 10Which of these animals is warm-blooded, making its own body heat?
Penguin
A penguin is a bird, so it makes its own body heat, and emperor penguins save that heat through Antarctic winter by huddling together.
Q 11What is the twisted-ladder shape of a DNA molecule called?
Double helix
The double helix beat a rival model: the chemist Linus Pauling had proposed that DNA was a triple helix, but his structure turned out to be mistaken.
Q 12Ocean tides are caused mainly by the gravitational pull of which object?
The Moon
The Moon's gravity is the main tide-raiser, being so much closer than the Sun; when Sun, Moon and Earth line up at new and full moon, the combined pull creates extra-large spring tides.
Q 13Earth's outer core is a liquid layer made mostly of nickel and which other metal?
Iron
Iron makes up most of the liquid outer core, alloyed with nickel; swirling currents in this molten iron produce Earth's magnetic field, which is why compasses point north.
Q 21A whole number greater than 1 that can only be divided evenly by 1 and itself is called what?
Prime
Prime numbers help guard online secrets: a common encryption method multiplies two huge primes, and even computers can't practically undo it by factoring the product.
Q 22What is 25 percent of 200?
50
25 percent of 200 is 50, so cutting 200 by 25 percent leaves 150, yet raising 150 by 25 percent adds only 37.50, landing at 187.50, not back at 200.
Q 23What is the probability of rolling a 4 on a single fair six-sided die?
1/6
Each face of a fair die has a 1/6 chance on every roll, no matter what came before, so a 4 is never 'due' after a long run without one.
Q 14Rock that forms when magma or lava cools and hardens is called what?
Igneous
Igneous rock can even float: pumice forms when gas-rich lava froths and hardens so fast that it traps countless bubbles, making it light enough to float on water.
Q 15Which planet is the largest in our solar system?
Jupiter
Jupiter is so massive that it and the Sun both circle a shared balance point lying just outside the Sun's surface.
Q 16On the pH scale, what number is neutral, the same as pure water?
7
Pure water sits at pH 7, and the first commercially successful electronic pH meter grew out of a citrus chemist's request to Arnold Beckman for a sturdier way to test lemon juice.
Q 17Which gas makes up about 78 percent of Earth's atmosphere?
Nitrogen
Nitrogen fills about 78 percent of the air, yet most living things can't use it directly; they depend largely on microbes that turn it into compounds cells can use.
Q 18What is the longest bone in the human body?
Femur
The femur tracks overall height so closely that forensic scientists can estimate a person's height from a femur alone, even when the rest of the skeleton is missing.
Q 19To two decimal places, what is the value of pi?
3.14
Pi begins 3.14, yet Indiana's House once passed a bill whose method implied pi could be 3.2, before a visiting Purdue math professor helped persuade the Senate to shelve it.
Q 20What do the three interior angles of a flat triangle add up to?
180 degrees
A flat triangle's angles always total 180 degrees, but on a curved surface like a ball, a triangle's angles can add up to more, as much as 540 degrees.
Q 24An angle measuring more than 90 degrees but less than a straight angle is called what?
Obtuse
Obtuse comes from an old word meaning 'blunt', and acute from one meaning 'sharpened', so a wide angle was named for looking blunt and a narrow one for looking pointed.
Q 25What is (-6) multiplied by (-4)?
24
Two negatives multiplied together always give a positive result; a negative times a positive gives a negative.
Q 26In a data set ordered smallest to largest, the value exactly in the centre is called what?
Median
The median is often used for incomes, because raising the biggest salaries pulls the mean upward but leaves the middle value untouched.
Q 27Which formula gives the area of a circle with radius r?
πr²
πr² matches Archimedes' discovery that a circle has the same area as a right triangle whose base is the circle's circumference and whose height is its radius.
Q 28A comparison that shows how many times one quantity contains another, like 3 to 2, is called a what?
Ratio
A ratio is how maps shrink the world: a scale of 1:50,000 means 1 centimeter on the map stands for 50,000 centimeters, or 500 meters, on the ground.
Q 29In which Italian city did the Renaissance begin?
Florence
Florence was the cradle of the Renaissance: its banking Medici family funded artists such as Botticelli and Michelangelo, and Brunelleschi's cathedral dome, finished in 1436, was a landmark of the new age.
Q 30Who built Europe's first movable-type printing press in the 1400s?
Johannes Gutenberg
Johannes Gutenberg did not invent movable type, which East Asian printers had used centuries before; his press made printing far faster, bringing mass-produced books to Europe.