1. Which of the following is a polysaccharide?
A) Glucose
B) Maltose
C) Cellulose
D) Fructose
✅ Answer: C) Cellulose
2. The major nitrogenous waste in humans is:
A) Urea
B) Ammonia
C) Uric acid
D) Nitrate
✅ Answer: A) Urea
3. In C4 plants, CO₂ fixation in mesophyll cells is done by:
A) Rubisco
B) PEP carboxylase
C) Malic enzyme
D) NADP
✅ Answer: B) PEP carboxylase
4. Which one is not a function of smooth ER?
A) Lipid synthesis
B) Detoxification
C) Protein synthesis
D) Steroid synthesis
✅ Answer: C) Protein synthesis
5. Which plant hormone is responsible for apical dominance?
A) Cytokinin
B) Auxin
C) Gibberellin
D) Ethylene
✅ Answer: B) Auxin
6. The QRS complex in ECG represents:
A) Atrial depolarization
B) Ventricular depolarization
C) Ventricular repolarization
D) Atrial repolarization
✅ Answer: B) Ventricular depolarization
7. Which is the correct sequence of stages in prophase I of meiosis?
A) Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis
✅ Answer: A) Leptotene → Zygotene → Pachytene → Diplotene → Diakinesis
8. Which enzyme helps in relaxing supercoiled DNA during replication?
A) DNA polymerase
B) Ligase
C) Helicase
D) Topoisomerase
✅ Answer: D) Topoisomerase
9. The mineral essential for synthesis of thyroxine is:
A) Iron
B) Calcium
C) Iodine
D) Zinc
✅ Answer: C) Iodine
10. During anaerobic respiration in muscles, the end product is:
A) Ethanol
B) CO₂
C) Lactic acid
D) Acetic acid
✅ Answer: C) Lactic acid
11. The genetic code is ‘degenerate’ because:
A) One codon codes for many amino acids
B) Many codons code for a single amino acid
✅ Answer: B) Many codons code for a single amino acid
12. The contractile protein of skeletal muscle is:
A) Tubulin
B) Myosin
C) Actin
D) Both B and C
✅ Answer: D) Both B and C
13. Which of the following is a nonsymbiotic nitrogen fixer?
A) Rhizobium
B) Nostoc
C) Azotobacter
D) Anabaena
✅ Answer: C) Azotobacter
14. In which stage of mitosis do chromosomes align at the equator?
A) Anaphase
B) Metaphase
C) Telophase
D) Prophase
✅ Answer: B) Metaphase
15. Which of the following is not a connective tissue?
A) Cartilage
B) Tendon
C) Blood
D) Epithelium
✅ Answer: D) Epithelium
16. Which plant hormone causes leaf abscission?
A) Auxin
B) Gibberellin
C) ABA
D) Cytokinin
✅ Answer: C) ABA (Abscisic Acid)
17. In gel electrophoresis, DNA fragments move towards:
A) Cathode
B) Anode
C) Both ends
D) Remain at the same place
✅ Answer: B) Anode
18. Which one is not a feature of genetic code?
A) Universal
B) Overlapping
C) Triplet
D) Non-ambiguous
✅ Answer: B) Overlapping
19. The root pressure develops due to:
A) Active absorption
B) Osmosis
C) Passive absorption
D) Diffusion
✅ Answer: A) Active absorption
20. Which of the following is the most stable RNA?
A) tRNA
B) rRNA
C) mRNA
D) hnRNA
✅ Answer: B) rRNA
21. In human beings, the chromosome number is:
A) 46 pairs
B) 23
C) 46
D) 22 pairs
✅ Answer: C) 46
22. Which immune cells are involved in cell-mediated immunity?
A) B-cells
B) T-cells
C) Platelets
D) RBCs
✅ Answer: B) T-cells
23. The carrier of electrons in the ETC is:
A) ATP
B) NADH
C) Glucose
D) CO₂
✅ Answer: B) NADH
24. The part of nephron that reabsorbs glucose:
A) Collecting duct
B) Loop of Henle
C) Proximal convoluted tubule
D) Distal convoluted tubule
✅ Answer: C) Proximal convoluted tubule
25. Which is a micronutrient for plants?
A) Calcium
B) Iron
C) Potassium
D) Magnesium
✅ Answer: B) Iron
26. Which technique is used in DNA fingerprinting?
A) PCR
B) Electrophoresis
C) Southern blotting
D) ELISA
✅ Answer: C) Southern blotting
27. In humans, the normal pH of blood is:
A) 7.4
B) 6.8
C) 8.2
D) 7.0
✅ Answer: A) 7.4
28. Antigen is a:
A) Type of antibody
B) Foreign molecule that triggers immune response
C) Type of hormone
D) Immune protein
✅ Answer: B) Foreign molecule that triggers immune response
29. The transpiration pull theory was proposed by:
A) Darwin
B) Dixon and Joly
C) Mendel
D) Linnaeus
✅ Answer: B) Dixon and Joly
30. The process of formation of glucose from non-carbohydrate sources is called:
A) Glycolysis
B) Glycogenesis
C) Gluconeogenesis
D) Glycogenolysis
✅ Answer: C) Gluconeogenesis
