Biology MCQs
Biology MCQs are a vital tool for students preparing for medical entrance exams like MDCAT, as well as competitive tests like CSS, PMS, FPSC, and PPSC. This section includes expertly designed multiple-choice questions that span major areas of biology, including cell biology, botany, zoology, genetics, microbiology, and human physiology. With each question crafted to improve conceptual clarity and analytical skills, this resource helps users achieve high scores in both academic and professional exams. Biology MCQs are also useful for students of FSc Pre-Medical, BSc, and other life science programs. Each question is aligned with the latest curriculum and designed according to the pattern of Pakistan’s competitive exams. Whether you are targeting entry tests, job assessments, or semester exams, our Biology MCQs offer reliable and result-oriented practice.
Q: Which human organ filters waste from the blood?
A) Heart
B) Liver
C) Kidney
D) Lung
✅ Correct Answer: C
Explanation: Kidneys filter blood to form urine.
Q: Which is the longest bone in the human body?
A) Radius
B) Tibia
C) Femur
D) Humerus
✅ Correct Answer: C
Explanation: The femur, or thigh bone, is the longest and strongest.
Q: Which disease is caused by deficiency of insulin?
A) Scurvy
B) Asthma
C) Cancer
D) Diabetes
✅ Correct Answer: D
Explanation: Diabetes is caused by insufficient insulin production or action.
Q: What is the function of platelets?
A) Transport nutrients
B) Carry oxygen
C) Fight infection
D) Blood clotting
✅ Correct Answer: D
Explanation: Platelets help in forming blood clots.
Q: What is the normal pH of human blood?
A) 8.5
B) 7.4
C) 6.0
D) 5.5
✅ Correct Answer: B
Explanation: A pH of 7.4 is slightly alkaline and optimal for body function.
Q: Which organ helps in detoxification of chemicals and drugs?
A) Liver
B) Lung
C) Kidney
D) Heart
✅ Correct Answer: A
Explanation: The liver detoxifies substances in the body.
Q: What is the name of the pigment that gives skin its color?
A) Melanin
B) Myosin
C) Keratin
D) Hemoglobin
✅ Correct Answer: A
Explanation: Melanin determines the pigmentation of skin.
Q: Which is the smallest bone in the human body?
A) Femur
B) Stapes
C) Tibia
D) Radius
✅ Correct Answer: B
Explanation: The stapes, located in the ear, is the smallest bone.
Q: What structure connects muscles to bones?
A) Nerves
B) Tendons
C) Ligaments
D) Cartilage
✅ Correct Answer: B
Explanation: Tendons attach muscles to bones.
Q: What is the primary function of red blood cells?
A) Regulate hormones
B) Fight infection
C) Blood clotting
D) Transport oxygen
✅ Correct Answer: D
Explanation: Red blood cells carry oxygen to body tissues.