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 gas is essential for respiration?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen
✅ Correct Answer: A
Explanation: Oxygen is required for cellular respiration.
Q: What is the largest organ in the human body?
A) Lungs
B) Skin
C) Liver
D) Heart
✅ Correct Answer: B
Explanation: The skin is the largest organ and protects the body.
Q: Which organ stores bile?
A) Pancreas
B) Kidney
C) Liver
D) Gallbladder
✅ Correct Answer: D
Explanation: The gallbladder stores and releases bile for digestion.
Q: Which blood group is known as the universal recipient?
A) AB
B) O
C) B
D) A
✅ Correct Answer: A
Explanation: AB can receive from any blood type.
Q: Which structure in plants transports water?
A) Phloem
B) Chloroplast
C) Xylem
D) Stomata
✅ Correct Answer: C
Explanation: Xylem conducts water from roots to leaves.
Q: What is the function of stomata?
A) Water absorption
B) Seed germination
C) Gas exchange
D) Photosynthesis
✅ Correct Answer: C
Explanation: Stomata allow exchange of gases in plant leaves.
Q: What is the function of the large intestine?
A) Digest proteins
B) Break down fats
C) Filter blood
D) Absorb water
✅ Correct Answer: D
Explanation: The large intestine absorbs water and forms feces.
Q: Which part of the eye controls the amount of light entering?
A) Pupil
B) Iris
C) Cornea
D) Retina
✅ Correct Answer: B
Explanation: The iris adjusts the size of the pupil to control light.
Q: Which hormone regulates sleep-wake cycles?
A) Estrogen
B) Insulin
C) Melatonin
D) Cortisol
✅ Correct Answer: C
Explanation: Melatonin helps regulate circadian rhythms.
Q: What does DNA stand for?
A) Dextrose Nucleic Acid
B) Dynamic Nucleic Acid
C) Dual Nitrogen Acid
D) Deoxyribonucleic Acid
✅ Correct Answer: D
Explanation: DNA carries genetic instructions.