Biology Mock Test PDF Free Download | 100+ Biology MCQs for Exams 2025

 Biology Mock Test PDF Free Download | 100+ Biology MCQs for Exams 2025

Prepare smarter for your upcoming exams with our Biology Mock Test PDF Free Download exclusively on MCQJourney.com. This comprehensive resource includes 100+ Biology MCQs with answers, covering important topics like Cell Biology, Genetics, Human Physiology, Ecology, and Biotechnology. Designed for students preparing for competitive exams, NEET, UPSC, SSC, Railway, Banking, and other entrance tests, this mock test ensures you practice the most exam-relevant questions. Each question comes with a detailed answer, making it easy to revise and strengthen your concepts. Whether you are focusing on General Knowledge (GK), Current Affairs, or subject-specific MCQs, this biology mock test PDF is your one-stop solution. Download it for free and boost your confidence with exam-oriented practice. Stay ahead in your preparation journey with MCQ Journey, your trusted platform for Education, GK, Current Affairs, and Exam MCQs.

✅ Biology MCQs with Answers

1. Which is the powerhouse of the cell?

   • a) Nucleus

   • b) Mitochondria

   • c) Ribosome

   • d) Golgi body

   •   Answer: b) Mitochondria

2. DNA replication occurs in which phase of the cell cycle?

   • a) G1 phase

   • b) S phase

   • c) G2 phase

   • d) M phase 

   • Answer: b) S phase

3. Which vitamin is synthesized in the skin by sunlight?

   • a) Vitamin A

   • b) Vitamin B12

   • c) Vitamin D

   • d) Vitamin K

   •   Answer: c) Vitamin D

4. Which blood group is known as the universal donor?

   • a) A

   • b) B

   • c) AB

   • d) O

   •   Answer: d) O

5. Which organ secretes insulin?

   • a) Liver

   • b) Pancreas

   • c) Kidney

   • d) Heart 

   • Answer: b) Pancreas

6. Which part of the plant conducts food?

   • a) Xylem

   • b) Phloem

   • c) Root

   • d) Leaf 

   • Answer: b) Phloem

7. Which enzyme breaks down starch into sugar?

   • a) Amylase

   • b) Lipase

   • c) Pepsin

   • d) Trypsin

   •   Answer: a) Amylase

8. Which gas is essential for photosynthesis?

   • a) Oxygen

   • b) Carbon dioxide

   • c) Nitrogen

   • d) Hydrogen

   •   Answer: b) Carbon dioxide

9. Which blood cells help in clotting?

   • a) RBC

   • b) WBC

   • c) Platelets

   • d) Plasma

   •   Answer: c) Platelets

10. Which organ purifies blood in humans?

    • a) Heart

    • b) Kidney

    • c) Liver

    • d) Lungs 

    • Answer: b) Kidney

11. Which pigment gives green color to plants?

    • a) Chlorophyll

    • b) Carotene

    • c) Xanthophyll

    • d) Anthocyanin 

    • Answer: a) Chlorophyll

12. Which is the largest gland in the human body?

    • a) Pancreas

    • b) Liver

    • c) Thyroid

    • d) Salivary gland 

    • Answer: b) Liver

13. Which organelle is responsible for protein synthesis?

    • a) Ribosome

    • b) Lysosome

    • c) Golgi body

    • d) Vacuole

    •   Answer: a) Ribosome

14. Which disease is caused by deficiency of Vitamin C?

    • a) Rickets

    • b) Scurvy

    • c) Beriberi

    • d) Night blindness

    •   Answer: b) Scurvy

15. Which part of the brain controls balance?

    • a) Cerebrum

    • b) Cerebellum

    • c) Medulla

    • d) Hypothalamus

    •   Answer: b) Cerebellum

16. Which organ stores bile?

    • a) Liver

    • b) Gall bladder

    • c) Pancreas

    • d) Kidney 

    • Answer: b) Gall bladder

17. Which is the structural and functional unit of kidney?

    • a) Neuron

    • b) Nephron

    • c) Alveoli

    • d) Glomerulus 

    • Answer: b) Nephron

18. Which disease is caused by Plasmodium parasite?

    • a) Dengue

    • b) Malaria

    • c) Cholera

    • d) Tuberculosis 

    • Answer: b) Malaria

19. Which organ helps in respiration in fish?

    • a) Lungs

    • b) Gills

    • c) Skin

    • d) Trachea 

    • Answer: b) Gills

20. Which blood group is known as universal recipient?

• a) A

• b) B

• c) AB

• d) O

•   Answer: c) AB

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