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AP Biology Biology Questions
Practise biology (science) for the AP Biology: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Biology practice
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Q1.Haemoglobin contains which metal?
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Answer: C — Iron
Iron in the haem group binds oxygen.
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Q2.Which blood cells help in clotting?
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Answer: A — Platelets
Platelets (thrombocytes) form clots.
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Q3.Which part of the brain controls balance and coordination?
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Answer: B — Cerebellum
The cerebellum coordinates movement and balance.
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Q4.In humans, the sex of a child is determined by the chromosome from the:
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Answer: B — Father
The father contributes either an X or a Y chromosome.
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Q5.Photosynthesis takes place in the:
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Answer: C — Chloroplasts
Chloroplasts contain chlorophyll that captures light energy.
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Q6.Who proposed the theory of evolution by natural selection?
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Answer: C — Charles Darwin
Darwin (with Wallace) proposed natural selection; ‘On the Origin of Species’ was published in 1859.
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Q7.The green pigment in plants is:
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Answer: B — Chlorophyll
Chlorophyll absorbs red and blue light for photosynthesis.
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Q8.The powerhouse of the cell is the:
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Answer: A — Mitochondrion
Mitochondria produce ATP through cellular respiration.
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Q9.Xylem in plants transports:
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Answer: C — Water and minerals
Xylem carries water and minerals upward; phloem carries food.
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Q10.The basic unit of heredity is the:
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Answer: B — Gene
Genes are segments of DNA that carry hereditary information.
How to approach biology questions
Learn structure → function links (mitochondria → ATP, nephron → filtration), the major hormones and their glands, and deficiency diseases. Diagrams help with cell organelles and organ systems.
About AP Biology
AP Biology — conducted by College Board. College-level biology: cells, genetics, evolution, ecology and physiology.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
AP Biology practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |