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UPSC Prelims Biology Questions
Practise biology (science) for the UPSC Civil Services Preliminary Examination: 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.Normal human body temperature is approximately:
Show answer & explanation
Answer: D — 37 °C
About 37 °C (98.6 °F).
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Q2.Which blood cells help in clotting?
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Answer: C — 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.Which vitamin deficiency causes scurvy?
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Answer: A — Vitamin C
Scurvy results from a lack of vitamin C (ascorbic acid).
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Q5.Which of these is a vestigial organ in humans?
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Answer: A — Appendix
The vermiform appendix is considered vestigial.
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Q6.Xylem in plants transports:
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Answer: B — Water and minerals
Xylem carries water and minerals upward; phloem carries food.
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Q7.The process by which cells divide to form gametes is:
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Answer: A — Meiosis
Meiosis halves the chromosome number to form gametes.
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Q8.Bile is produced by the:
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Answer: D — Liver
Bile is made in the liver and stored in the gall bladder.
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Q9.Antibiotics are effective against:
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Answer: D — Bacteria
Antibiotics target bacteria, not viruses.
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Q10.Which organelle synthesises proteins?
Show answer & explanation
Answer: C — Ribosome
Ribosomes translate mRNA into protein.
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 UPSC Prelims
UPSC Civil Services Preliminary Examination — conducted by Union Public Service Commission (UPSC). The first stage of India’s civil services recruitment, with a General Studies paper and the qualifying CSAT aptitude paper.
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.
UPSC Prelims practice topics
| Topic | Section | Question source |
|---|---|---|
| Indian Polity, History & Geography | General awareness | Question bank |
| Economy & Banking Awareness | General awareness | Question bank |
| World General Knowledge | General awareness | Question bank |
| Biology | Science | Question bank |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |