Preparing for the Bihar Board Class 12th Biology examination requires strong conceptual clarity and continuous practice of objective-type questions. Most questions in the board exam are directly or indirectly based on NCERT Biology syllabus. To help students score better marks, we have compiled Bihar board class 12th biology 75 objective question 75 with option, covering all important chapters such as Genetics, Biotechnology, Human Health, Ecology, Reproduction, and Evolution.
These MCQs are extremely useful for last-minute revision as well as regular practice.
Bihar Board Class 12th Biology 75 Objective Question 75 with Option | MCQ Practice
1. Who is known as the father of genetics?
A. Darwin
B. Mendel
C. Lamarck
D. Watson
Answer: B
2. Functional unit of heredity is called –
A. Chromosome
B. DNA
C. Gene
D. RNA
Answer: C
3. DNA replication occurs during which phase?
A. G1 phase
B. S phase
C. G2 phase
D. M phase
Answer: B
4. Which bond joins amino acids?
A. Hydrogen bond
B. Peptide bond
C. Glycosidic bond
D. Phosphodiester bond
Answer: B
5. Double helix structure of DNA was proposed by –
A. Watson and Crick
B. Meselson and Stahl
C. Hershey and Chase
D. Franklin and Wilkins
Answer: A
6. RNA differs from DNA because RNA has –
A. Thymine
B. Deoxyribose sugar
C. Ribose sugar
D. Double strand
Answer: C
7. Which enzyme is used in DNA replication?
A. RNA polymerase
B. DNA polymerase
C. Ligase
D. Helicase
Answer: B
8. Crossing over occurs during –
A. Prophase I
B. Metaphase I
C. Anaphase I
D. Telophase I
Answer: A
9. The genetic material in tobacco mosaic virus is –
A. DNA
B. RNA
C. Protein
D. Lipid
Answer: B
10. Which blood group is universal donor?
A. A
B. B
C. AB
D. O
Answer: D
11. Insulin is secreted by –
A. Alpha cells
B. Beta cells
C. Delta cells
D. Acinar cells
Answer: B
12. Which vitamin is produced in skin?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D
Answer: D
13. AIDS is caused by –
A. Bacteria
B. Virus
C. Fungi
D. Protozoa
Answer: B
14. The study of population is called –
A. Ecology
B. Taxonomy
C. Demography
D. Ethology
Answer: C
15. Which gas is released during photosynthesis?
A. Carbon dioxide
B. Nitrogen
C. Oxygen
D. Hydrogen
Answer: C
16. The powerhouse of the cell is –
A. Nucleus
B. Ribosome
C. Mitochondria
D. Golgi body
Answer: C
17. Pollination by wind is called –
A. Entomophily
B. Hydrophily
C. Anemophily
D. Zoophily
Answer: C
18. Which hormone regulates growth?
A. Thyroxine
B. Insulin
C. Growth hormone
D. Adrenaline
Answer: C
19. Study of fossils is known as –
A. Embryology
B. Palaeontology
C. Morphology
D. Anatomy
Answer: B
20. Which tissue transports water in plants?
A. Phloem
B. Cambium
C. Xylem
D. Cortex
Answer: C
21. The largest gland in human body is –
A. Pancreas
B. Thyroid
C. Liver
D. Pituitary
Answer: C
22. Who proposed theory of natural selection?
A. Mendel
B. Lamarck
C. Darwin
D. Wallace
Answer: C
23. Which disease is caused by Plasmodium?
A. Typhoid
B. Dengue
C. Malaria
D. Cholera
Answer: C
24. Ribosomes are made up of –
A. DNA
B. RNA and protein
C. Lipid
D. Cellulose
Answer: B
25. The basic unit of ecology is –
A. Population
B. Species
C. Community
D. Ecosystem
Answer: A
26. Semen contains –
A. Sperm only
B. Seminal fluid only
C. Sperm and seminal fluid
D. Hormones
Answer: C
27. Test tube baby technique is called –
A. IVF
B. GIFT
C. ZIFT
D. AI
Answer: A
28. Which hormone controls menstrual cycle?
A. Estrogen
B. Progesterone
C. FSH & LH
D. All of these
Answer: D
29. Which organ purifies blood?
A. Heart
B. Liver
C. Kidney
D. Lung
Answer: C
30. Nitrogen fixation is carried out by –
A. Algae
B. Virus
C. Bacteria
D. Fungi
Answer: C
31. Which is a biodegradable pollutant?
A. Plastic
B. DDT
C. Sewage
D. Mercury
Answer: C
32. PCR technique is used for –
A. Protein synthesis
B. DNA amplification
C. Cell division
D. Mutation
Answer: B
33. Cloning was first done in –
A. Sheep
B. Cow
C. Frog
D. Goat
Answer: C
34. Dolly was a cloned –
A. Cow
B. Goat
C. Sheep
D. Horse
Answer: C
35. The study of tissues is called –
A. Anatomy
B. Morphology
C. Histology
D. Cytology
Answer: C
36. Which organelle is absent in prokaryotes?
A. Ribosome
B. Cell wall
C. Nucleus
D. Plasma membrane
Answer: C
37. Heartbeat is controlled by –
A. SA node
B. AV node
C. Purkinje fibers
D. Medulla
Answer: A
38. The unit of inheritance is –
A. DNA
B. RNA
C. Chromosome
D. Gene
Answer: D
39. Which part of brain controls balance?
A. Cerebrum
B. Cerebellum
C. Medulla
D. Thalamus
Answer: B
40. Which vitamin prevents scurvy?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin K
Answer: C
41. Transpiration occurs through –
A. Roots
B. Stomata
C. Xylem
D. Phloem
Answer: B
42. Who discovered cell?
A. Leeuwenhoek
B. Robert Hooke
C. Schleiden
D. Schwann
Answer: B
43. Which chromosome determines sex?
A. X
B. Y
C. Autosomes
D. Both X and Y
Answer: D
44. Ecology deals with –
A. Cells
B. Tissues
C. Organisms and environment
D. Fossils
Answer: C
45. Which hormone increases blood sugar?
A. Insulin
B. Glucagon
C. Thyroxine
D. Estrogen
Answer: B
46. Vaccination provides –
A. Active immunity
B. Passive immunity
C. Natural immunity
D. Innate immunity
Answer: A
47. Which part of flower forms fruit?
A. Ovary
B. Ovule
C. Petal
D. Sepal
Answer: A
48. Largest ecosystem on earth is –
A. Forest
B. Grassland
C. Desert
D. Ocean
Answer: D
49. Oxygen is transported by –
A. RBC
B. WBC
C. Platelets
D. Plasma
Answer: A
50. The longest bone in human body is –
A. Tibia
B. Femur
C. Humerus
D. Radius
Answer: B
51. Which plant hormone promotes cell elongation?
A. Auxin
B. Cytokinin
C. Ethylene
D. ABA
Answer: A
52. Which disease is genetic?
A. Tuberculosis
B. Malaria
C. Haemophilia
D. Cholera
Answer: C
53. Which gas causes global warming?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
Answer: C
54. The site of fertilization in human female is –
A. Ovary
B. Uterus
C. Fallopian tube
D. Cervix
Answer: C
55. Which cell lacks nucleus?
A. WBC
B. RBC
C. Nerve cell
D. Muscle cell
Answer: B
56. Antibiotics are obtained from –
A. Virus
B. Bacteria
C. Fungi
D. Both B and C
Answer: D
57. Which organ produces bile?
A. Pancreas
B. Liver
C. Gall bladder
D. Intestine
Answer: B
58. Ozone layer is found in –
A. Troposphere
B. Mesosphere
C. Stratosphere
D. Ionosphere
Answer: C
59. Study of insects is called –
A. Entomology
B. Ichthyology
C. Ornithology
D. Herpetology
Answer: A
60. Which structure carries genetic information?
A. Protein
B. Lipid
C. DNA
D. Enzyme
Answer: C
61. Blood clotting requires –
A. Calcium
B. Sodium
C. Potassium
D. Iron
Answer: A
62. The smallest bone in human body is –
A. Stapes
B. Malleus
C. Incus
D. Cochlea
Answer: A
63. Which plant shows double fertilization?
A. Bryophytes
B. Pteridophytes
C. Gymnosperms
D. Angiosperms
Answer: D
64. Chromosomes are visible during –
A. Interphase
B. Prophase
C. Metaphase
D. Telophase
Answer: C
65. Which organ helps in respiration?
A. Kidney
B. Heart
C. Lung
D. Liver
Answer: C
66. Which disease spreads by mosquito?
A. Polio
B. Malaria
C. TB
D. AIDS
Answer: B
67. The process of formation of gametes is –
A. Mitosis
B. Meiosis
C. Fertilization
D. Regeneration
Answer: B
68. Which vitamin helps in blood clotting?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin K
Answer: D
69. Which organ stores urine?
A. Kidney
B. Ureter
C. Urinary bladder
D. Urethra
Answer: C
70. Unit of life is –
A. Tissue
B. Organ
C. Cell
D. System
Answer: C
71. Which hormone is called emergency hormone?
A. Insulin
B. Thyroxine
C. Adrenaline
D. Estrogen
Answer: C
72. Which gas is essential for respiration?
A. Carbon dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer: B
73. Which blood group is universal recipient?
A. A
B. B
C. O
D. AB
Answer: D
74. The process of water loss from plant is –
A. Respiration
B. Translocation
C. Transpiration
D. Absorption
Answer: C
75. Which organ controls all activities of body?
A. Heart
B. Lung
C. Brain
D. Kidney
Answer: C
Conclusion
These Bihar board class 12th biology 75 objective question 75 with option are designed strictly according to the Bihar Board syllabus and NCERT guidelines. Practicing these MCQs will boost confidence, improve accuracy, and help students score high marks in the final examination. For best results, revise these questions multiple times before the exam.
FAQs – Bihar Board Class 12th Biology Objective Questions
### Q1. Are these Bihar Board Class 12th Biology objective questions based on the latest syllabus?
Yes, all the Bihar board class 12th biology 75 objective question 75 with option are prepared strictly according to the latest Bihar Board syllabus and NCERT Biology textbooks.
### Q2. How many objective questions are asked in Bihar Board Class 12th Biology exam?
In the Bihar Board Class 12th Biology exam, students are generally asked a large number of objective-type questions, out of which a specific number must be attempted as per the exam pattern.
### Q3. Are MCQs enough to score good marks in Biology?
Objective questions play a crucial role in scoring marks. Regular practice of MCQs along with theory revision can help students secure high marks in the Biology exam.
### Q4. From which chapters are these Biology objective questions taken?
These questions are taken from important chapters such as Genetics, Human Reproduction, Biotechnology, Ecology, Evolution, Human Health & Disease, and Cell Biology.
### Q5. How should students practice these objective questions for best results?
Students should practice these MCQs daily, revise wrong answers, understand concepts behind each question, and solve them in a time-bound manner to improve speed and accuracy.