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AP Biology Mock Test
A timed 25-question mock for the AP Biology covering biology. Answer, submit and review every question with its explanation; set negative marking to match your exam’s current scheme.
AP Biology mock test
25 questions · 1 mark each · the timer starts with your first answer and the test submits itself when time runs out.
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Q1.The number of chromosomes in a normal human body cell is:
Answer: D — 46
Humans have 46 chromosomes (23 pairs).
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Q2.Bile is produced by the:
Answer: C — Liver
Bile is made in the liver and stored in the gall bladder.
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Q3.The functional unit of the kidney is the:
Answer: B — Nephron
Each kidney has about a million nephrons that filter blood.
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Q4.The green pigment in plants is:
Answer: D — Chlorophyll
Chlorophyll absorbs red and blue light for photosynthesis.
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Q5.The largest organ of the human body is the:
Answer: B — Skin
The skin is the largest organ by area and weight.
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Q6.In humans, the sex of a child is determined by the chromosome from the:
Answer: D — Father
The father contributes either an X or a Y chromosome.
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Q7.Which part of the brain controls balance and coordination?
Answer: C — Cerebellum
The cerebellum coordinates movement and balance.
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Q8.Photosynthesis takes place in the:
Answer: A — Chloroplasts
Chloroplasts contain chlorophyll that captures light energy.
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Q9.DNA is mainly found in the cell’s:
Answer: C — Nucleus
Most DNA is in the nucleus (some in mitochondria and chloroplasts).
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Q10.Gas exchange in the lungs takes place in the:
Answer: B — Alveoli
Thin-walled alveoli allow oxygen and CO₂ to diffuse.
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Q11.Normal human body temperature is approximately:
Answer: A — 37 °C
About 37 °C (98.6 °F).
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Q12.Which part of the flower develops into the fruit?
Answer: A — Ovary
After fertilisation the ovary develops into the fruit.
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Q13.Who proposed the theory of evolution by natural selection?
Answer: D — Charles Darwin
Darwin (with Wallace) proposed natural selection; ‘On the Origin of Species’ was published in 1859.
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Q14.Haemoglobin contains which metal?
Answer: C — Iron
Iron in the haem group binds oxygen.
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Q15.The powerhouse of the cell is the:
Answer: D — Mitochondrion
Mitochondria produce ATP through cellular respiration.
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Q16.Which enzyme in saliva begins starch digestion?
Answer: B — Salivary amylase (ptyalin)
Salivary amylase breaks starch into maltose.
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Q17.The basic unit of heredity is the:
Answer: C — Gene
Genes are segments of DNA that carry hereditary information.
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Q18.The process by which cells divide to form gametes is:
Answer: D — Meiosis
Meiosis halves the chromosome number to form gametes.
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Q19.Malaria is caused by:
Answer: A — Plasmodium (a protozoan)
Plasmodium parasites are spread by female Anopheles mosquitoes.
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Q20.Antibiotics are effective against:
Answer: C — Bacteria
Antibiotics target bacteria, not viruses.
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Q21.Xylem in plants transports:
Answer: B — Water and minerals
Xylem carries water and minerals upward; phloem carries food.
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Q22.Insulin is secreted by the:
Answer: D — Pancreas
Beta cells of the pancreatic islets of Langerhans secrete insulin.
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Q23.Which blood cells help in clotting?
Answer: A — Platelets
Platelets (thrombocytes) form clots.
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Q24.The universal blood donor group is:
Answer: B — O−
O negative red cells lack A, B and Rh antigens.
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Q25.Which vitamin deficiency causes scurvy?
Answer: C — Vitamin C
Scurvy results from a lack of vitamin C (ascorbic acid).
How the mock test works
- The timer starts with your first answer; the test submits itself when time runs out.
- Choose the negative marking that matches your exam (this test has no negative marking by default — check the official notification).
- After submitting you get your score, accuracy, time taken and a topic-wise breakdown, then every explanation.
- “New mock test” builds another paper — calculation questions get new numbers.
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 |