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RRB Group D Biology Questions
Practise biology (science) for the RRB Level 1 (Group D) 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.Antibiotics are effective against:
Show answer & explanation
Answer: B — Bacteria
Antibiotics target bacteria, not viruses.
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Q2.The universal blood donor group is:
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Answer: B — O−
O negative red cells lack A, B and Rh antigens.
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Q3.The basic unit of heredity is the:
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Answer: A — Gene
Genes are segments of DNA that carry hereditary information.
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Q4.Malaria is caused by:
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Answer: C — Plasmodium (a protozoan)
Plasmodium parasites are spread by female Anopheles mosquitoes.
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Q5.The father of genetics is:
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Answer: C — Gregor Mendel
Mendel’s pea plant experiments established the laws of inheritance.
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Q6.Haemoglobin contains which metal?
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Answer: D — Iron
Iron in the haem group binds oxygen.
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Q7.Which organelle synthesises proteins?
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Answer: B — Ribosome
Ribosomes translate mRNA into protein.
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Q8.Which blood cells help in clotting?
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Answer: A — Platelets
Platelets (thrombocytes) form clots.
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Q9.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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Q10.Which of these is a vestigial organ in humans?
Show answer & explanation
Answer: B — Appendix
The vermiform appendix is considered vestigial.
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 RRB Group D
RRB Level 1 (Group D) Examination — conducted by Railway Recruitment Boards (RRB). Recruits track maintainers, helpers and assistants; general science carries significant weight.
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.
RRB Group D practice topics
| Topic | Section | Question source |
|---|---|---|
| Number System & Simplification | Quantitative aptitude | Calculated (new numbers every set) |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Logical Reasoning | Reasoning | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| Biology | Science | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |