Rajesh Jaipal is the creator of "The Govt Guide", a leading educational blog for Sarkari job updates, NCERT notes, government exam preparation, latest vacancy alerts, and study resources. With a B.Sc. and B.Ed. degree, he aims to simplify competitive exam prep for SSC, RPSC, Railway, and State Govt exams. His mission is to provide accurate, fast, and free educational content to students across India.
Ace Your Biology Exam - 30 Must-Know MCQs to Fuel Your Success | NEET 2025 Biology 30 MCQs Quiz
Ace NEET 2025 with our interactive quiz! Test your knowledge with Top 30 Biology MCQs covering topics like cell biology, human physiology, genetics...
Ace Your Biology Exam: 50 Must-Know MCQs to Fuel Your Success | NEET 2025 Biology MCQs Quiz | Top 30 MCQs
Welcome to our interactive NEET 2025 Biology quiz! Test your knowledge on diverse topics with these top MCQs. Click any option to see if you’re right or wrong, check out the instant explanation, and watch your score grow as you progress. Best of luck!
1. Which of the following is a non-reducing sugar?
Explanation: Sucrose lacks a free aldehyde or ketone group, making it a non-reducing sugar.
2. Which enzyme is responsible for the breakdown of hydrogen peroxide in cells?
Explanation: Catalase catalyzes the decomposition of hydrogen peroxide into water and oxygen, protecting cells from oxidative damage.
3. In the human body, the primary site for urea formation is:
Explanation: The liver converts ammonia into urea through the urea cycle, which is then excreted by the kidneys.
4. Which of the following hormones is not secreted by the anterior pituitary?
Explanation: Oxytocin is produced by the hypothalamus and released by the posterior pituitary.
5. The functional unit of the kidney is:
Explanation: The nephron is the basic structural and functional unit of the kidney, responsible for filtering blood and forming urine.
6. Which of the following is a vestigial organ in humans?
Explanation: The appendix is considered a vestigial organ with no significant function in modern humans.
7. Which of the following is not a connective tissue?
Explanation: Muscle tissue is responsible for movement, whereas connective tissues support and bind other tissues.
8. Which part of the brain regulates body temperature?
Explanation: The hypothalamus acts as the body's thermostat, maintaining homeostasis.
9. The process of formation of blood cells is known as:
Explanation: Hemopoiesis is the process by which new blood cells are produced in the bone marrow.
10. Which vitamin is essential for blood clotting?
Explanation: Vitamin K is crucial for synthesizing clotting factors, preventing excessive bleeding.
11. Which of the following is a characteristic feature of prokaryotic cells?
Explanation: Prokaryotic cells lack a true nucleus; their DNA is located in the nucleoid region without a surrounding membrane.
12. The primary function of the xylem in plants is:
Explanation: Xylem is responsible for the conduction of water and dissolved minerals from roots to aerial parts of the plant.
13. Which of the following is not a component of the human male reproductive system?
Explanation: Fallopian tubes are part of the female reproductive system; they transport ova from the ovaries to the uterus.
14. In the human heart, the valve between the left atrium and left ventricle is:
Explanation: The bicuspid or mitral valve regulates blood flow from the left atrium to the left ventricle.
15. Which of the following organisms exhibits external fertilization?
Explanation: Frogs release eggs and sperm into the external environment where fertilization occurs outside the body.
16. The process by which green plants synthesize their food is called:
Explanation: Photosynthesis is the process by which green plants use sunlight to synthesize food from carbon dioxide and water.
17. Which of the following is a sexually transmitted disease (STD)?
Explanation: AIDS (Acquired Immunodeficiency Syndrome) is caused by the HIV virus and is transmitted through sexual contact, among other routes.
18. The genetic material in most living organisms is:
Explanation: DNA (Deoxyribonucleic acid) carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms.
19. Which part of the brain is responsible for maintaining posture and balance?
Explanation: The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech.
20. Which of the following blood groups is known as the universal donor?
Explanation: Blood group O negative is considered the universal donor because it lacks A, B, and Rh antigens, reducing the risk of immune reactions.
21. Which of the following is the primary site of photosynthesis in plants?
Explanation: Mesophyll cells, located in the leaves, contain chloroplasts and are the main site for photosynthesis.
22. Which hormone is responsible for the 'fight or flight' response in humans?
Explanation: Adrenaline, secreted by the adrenal medulla, prepares the body for emergency situations by increasing heart rate and energy availability.
23. In which part of the nephron does selective reabsorption occur?
Explanation: The proximal convoluted tubule reabsorbs essential nutrients, ions, and water back into the bloodstream.
24. Which of the following is not a component of the human respiratory system?
Explanation: The esophagus is part of the digestive system, transporting food from the mouth to the stomach.
25. What is the genetic material in retroviruses?
Explanation: Retroviruses contain single-stranded RNA, which is reverse-transcribed into DNA in the host cell.
26. Which vitamin deficiency causes rickets in children?
Explanation: Vitamin D deficiency leads to rickets, characterized by soft and weak bones in children.
27. Which of the following is a symbiotic association?
Explanation: Lichens are a mutualistic relationship where algae provide food through photosynthesis, and fungi offer protection and support.
28. Which process converts nitrogen gas into ammonia?
Explanation: Nitrogen fixation is the process where atmospheric nitrogen is converted into ammonia by certain bacteria.
29. Which organelle is known as the 'powerhouse of the cell'?
Explanation: Mitochondria generate ATP through cellular respiration, supplying energy to the cell.
30. Which of the following is not a function of the skeletal system?
Explanation: While the skeletal system supports the body, produces blood cells, and protects organs, hormone secretion is primarily a function of the endocrine system.
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My name is Rajesh Kumar, and I am from Gharsana, Sri Ganganagar in Rajasthan. I have completed my Bachelor of Science (B.Sc.) in 2017 and Bachelor of Education (B.Ed.) in 2019 from Maharaja Ganga Singh University, Bikaner. I hold a Master’s degree (M.A.) in Philosophy, completed in 2022, and I am currently pursuing M.A. in Sociology.
I have work experience in the insurance sector and possess strong skills in MS Office, typing, and I hold a certificate in RSCIT. I am fluent in Hindi, Punjabi, and English. At present, I am preparing for competitive exams like DSSSB and UGC NET (Philosophy).
I also run educational blog called “The Govt Guide” & "Literary Sphere", where I post content related to NCERT Notes, Govt job vacancy, literature and exam preparation. My hobbies include playing chess and reading books.
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