Biology Quiz
Cells, DNA, evolution, ecosystems and the science of living things.
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About the Biology Quiz
Biology is the study of life, from single cells to entire ecosystems. These questions cover cells and DNA, genetics, evolution, classification and the processes that keep living things alive.
This quiz has 20 questions, served in rounds of 10 with a fresh mix and shuffled answers every time you play. Every answer comes with a short explanation.
Sample Biology Questions & Answers
Q1. What molecule carries genetic information in most living things?
✅ Answer: DNA
💡 DNA (deoxyribonucleic acid) stores the instructions for building and running an organism.
Q2. Which scientists described the double-helix structure of DNA in 1953?
✅ Answer: Watson and Crick
💡 James Watson and Francis Crick’s model relied on X-ray images by Rosalind Franklin.
Q3. What is the basic unit of life?
✅ Answer: Cell
💡 All living things are made of one or more cells.
Q4. Who is known as the father of genetics for his experiments with pea plants?
✅ Answer: Gregor Mendel
💡 Mendel’s 1860s experiments revealed how traits are inherited.
Q5. Which part of a plant cell carries out photosynthesis?
✅ Answer: Chloroplast
💡 Chloroplasts contain chlorophyll, which captures energy from sunlight.