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100 free 7th Grade trivia questions with answers — trivia quiz, new questions added Aug 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.
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Q 01Which organelle is nicknamed the "powerhouse of the cell"?
Mitochondrion
The mitochondrion is the 'powerhouse of the cell', a nickname popularized by Philip Siekevitz's 1957 Scientific American article; its folded inner membrane hosts the energy-releasing reactions that make ATP.
Q 02Along with water and light, what do plants need to make their own food through photosynthesis?
Carbon dioxide
Plants take in carbon dioxide through tiny leaf pores called stomata and combine it with water, using light energy, to make glucose; the oxygen we breathe is the by-product.
Q 03Gregor Mendel worked out the basic rules of inheritance by breeding which plant?
Peas
Mendel used peas; in his monastery garden at Brno he tracked seven traits, such as seed shape and flower colour, across roughly 28,000 pea plants.
Q 04What is the basic unit of heredity called?
Gene
A gene is the basic unit of heredity: a stretch of DNA that codes for a protein or RNA, and humans carry roughly 20,000 protein-coding genes.
Q 05Which type of blood cell carries oxygen from the lungs to the rest of the body?
Red cells
Red cells (erythrocytes) carry oxygen: the iron-rich protein hemoglobin inside them binds oxygen in the lungs and releases it in the tissues, and it gives blood its red colour.
Q 06What is the largest organ of the human body?
Skin
The skin is the largest organ, making up about 16 percent of body mass; it is the main part of the integumentary system, with the liver the largest internal organ.
Q 07Mushrooms, yeasts and molds all belong to which biological kingdom?
Fungi
Mushrooms, yeasts and molds are Fungi: unlike plants they cannot photosynthesize, and their cell walls are made of chitin, the same material as an insect's exoskeleton.
Q 08A caterpillar turns into a butterfly through a process called what?
Metamorphosis
Metamorphosis is the transformation from larva to adult; a caterpillar enters a resting stage called a chrysalis, inside which its body is rebuilt into a butterfly.
Q 09Which structure do plant cells have that animal cells lack, giving them their rigid shape?
Cell wall
The cell wall, made mainly of cellulose, sits outside the plant cell membrane; its stiffness lets a stem stand upright without a skeleton, and animal cells have none.
Q 10What are animals like birds and mammals called, which keep a steady body temperature?
Warm-blooded
Warm-blooded animals keep a steady internal temperature; scientists prefer the terms endothermic and homeothermic, since tuna and even bumblebees can also heat parts of their bodies.
Q 11What is the twisted-ladder shape of a DNA molecule called?
Double helix
DNA is a double helix: two strands twisted around each other like a spiral ladder, a structure Watson and Crick proposed in 1953 using X-ray images made by Rosalind Franklin and Raymond Gosling.
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 generate 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
The number 2 is the only even one; every other even number can be divided by 2.
Q 22What is 25 percent of 200?
50
Percent means "per hundred", so 25 percent is a quarter, and a quarter of 200 is 50.
Q 23What is the probability of rolling a 4 on a single fair six-sided die?
1/6
Each face is equally likely, so every single number has the same one-in-six chance on each roll, no matter what came before.
Q 24An angle measuring more than 90 but less than 180 degrees is called what?
Q 14Rock that forms when magma or lava cools and hardens is called what?
Igneous
Igneous rock forms from cooled magma or lava: granite is the slow-cooled underground kind, while basalt and obsidian form when lava cools quickly at the surface.
Q 15Which planet is the largest in our solar system?
Jupiter
Jupiter is the largest planet: more than 1,300 Earths could fit inside it, and its mass is about two and a half times that of all the other planets combined.
Q 16On the pH scale, what number is neutral, the same as pure water?
7
Pure water is pH 7, the neutral point; lower numbers are acids like lemon juice, higher numbers are bases like baking-soda solution, and each step is a tenfold change in acidity.
Q 17Which gas makes up about 78 percent of Earth's atmosphere?
Nitrogen
Nitrogen makes up about 78 percent of the atmosphere; oxygen is about 21 percent, and the third-biggest ingredient, argon, is under one percent.
Q 18What is the longest bone in the human body?
Femur
The femur, or thigh bone, runs from hip to knee and is about a quarter of a person's height, making it the longest and, by most measures, strongest bone.
Q 19To two decimal places, what is the value of pi?
3.14
Pi is 3.14159..., so 3.14 to two decimal places; it is the ratio of any circle's circumference to its diameter, and its digits go on forever without repeating.
Q 20What do the three interior angles of any triangle add up to?
180 degrees
A triangle's interior angles always total 180 degrees, which is why a right triangle's other two angles add to 90; the exterior angles of any convex polygon total 360 degrees.
Obtuse
An obtuse angle measures between 90 and 180 degrees; the word comes from the Latin obtusus, 'blunt', while angles under 90 degrees are acute, meaning sharp.
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 the middle value of an ordered list; with an even number of values you average the two middle numbers, unlike the mean, which averages them all.
Q 27Which formula gives the area of a circle with radius r?
πr²
Area = πr²; a circle of radius 2 has area 4π, about 12.57. The similar-looking 2πr is the circumference, the distance around the circle, not the space inside.
Q 28A comparison that shows how many times one quantity contains another, like 3 to 2, is called a what?
Ratio
A ratio compares two quantities of the same kind, such as 3 to 2, written 3:2 or 3/2; when the units differ, like miles and hours, the comparison is usually called a rate.
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 built his press in Mainz around 1450; movable type already existed in East Asia, but his metal type, oil-based ink and press made mass-producing books practical.