Neet Exam Most Repeated 100 Biology MCQS

   Neet Exam Most  Repeated  100 Biology MCQS

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Get exam-ready with our carefully curated list of the NEET Exam Most Repeated 100 Biology MCQs. This collection features the most frequently asked questions from past NEET papers, designed to boost your revision and improve your accuracy. Whether you're aiming for top ranks or reinforcing key biology concepts, these NEET important MCQs with answers will help you master chapters like Human Physiology, Genetics, Ecology, and more. Perfect for last-minute revision and mock test preparation!

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Top 100 Most Repeated NEET Biology MCQs | Important NEET Biology Questions with Answers

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Unit 1: Diversity of Living Organisms

1. Which of the following is the correct scientific name of mango?
   A) Mangifera indica ✅
   B) Mangifera indica Linn
   C) Mangifera indica L.
   D) Mangifera indica L.

2. Binomial nomenclature was given by:
   A) Darwin
   B) Aristotle
   C) Linnaeus ✅
   D) Lamarck

3. Which kingdom includes unicellular, prokaryotic organisms?
   A) Protista
   B) Monera ✅
   C) Fungi
   D) Plantae

4. Which of the following is a connecting link between amphibians and reptiles?
   A) Archaeopteryx
   B) Seymouria ✅
   C) Limulus
   D) Ichthyostega

5. The five-kingdom classification was proposed by:
   A) Whittaker ✅
   B) Linnaeus
   C) Haeckel
   D) Aristotle

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Unit 2: Structural Organisation in Animals and Plants

6. Which of the following tissue forms the inner lining of blood vessels?
   A) Cuboidal
   B) Columnar
   C) Squamous epithelium ✅
   D) Ciliated epithelium

7. Malpighian tubules are excretory structures in:
   A) Earthworm
   B) Cockroach ✅
   C) Hydra
   D) Frog

8. In hydra, the cell responsible for capturing prey is:
   A) Epithelial
   B) Nematoblast ✅
   C) Parenchyma
   D) Collencyte

9. The hardest substance in the human body is:
   A) Dentine
   B) Cartilage
   C) Bone
   D) Enamel ✅

10. What type of connective tissue is found in tendons?
    A) Loose connective tissue
    B) Dense irregular connective tissue
    C) Dense regular connective tissue ✅
    D) Areolar tissue

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Unit 3: Cell Structure and Function

11. Which organelle is known as the ‘powerhouse’ of the cell?
    A) Ribosome
    B) Nucleus
    C) Mitochondria ✅
    D) Chloroplast

12. The fluid mosaic model of membrane structure was given by:
    A) Robertson
    B) Singer and Nicolson ✅
    C) Watson and Crick
    D) Schleiden and Schwann

13. Ribosomes are found in:
    A) Nucleus
    B) Mitochondria
    C) Cytoplasm ✅
    D) Cell wall

14. Which of the following cell organelles does not contain DNA?
    A) Nucleus
    B) Mitochondria
    C) Chloroplast
    D) Ribosome ✅

15. Centrioles are found in:
    A) Plant cells
    B) Animal cells ✅
    C) Both
    D) Bacteria

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Unit 4: Plant Physiology

16. Photosynthesis occurs in:
    A) Mitochondria
    B) Cytoplasm
    C) Chloroplast ✅
    D) Ribosomes

17. The enzyme responsible for CO₂ fixation in the Calvin cycle is:
    A) ATPase
    B) Rubisco ✅
    C) PEP carboxylase
    D) Amylase

18. Which plant hormone is known as the ‘stress hormone’?
    A) Auxin
    B) Cytokinin
    C) Abscisic acid ✅
    D) Ethylene

19. Opening and closing of stomata is controlled by:
    A) Mesophyll cells
    B) Guard cells ✅
    C) Palisade cells
    D) Xylem

20. Transpiration occurs through:
    A) Xylem
    B) Phloem
    C) Stomata ✅
    D) Cuticle

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(Continued in next message…)

Here’s the continuation of the 100 most repeated NEET Biology MCQs, with answers and topics arranged by unit to help you focus your NEET preparation.

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Unit 5: Human Physiology

21. Which enzyme is present in saliva?
    A) Pepsin
    B) Trypsin
    C) Amylase ✅
    D) Lipase

22. Which organ secretes bile?
    A) Stomach
    B) Pancreas
    C) Liver ✅
    D) Gallbladder

23. The functional unit of the kidney is:
    A) Nephron ✅
    B) Alveolus
    C) Neuron
    D) Glomerulus

24. The pacemaker of the heart is:
    A) AV node
    B) SA node ✅
    C) Purkinje fibers
    D) Bundle of His

25. Exchange of gases in lungs takes place in:
    A) Bronchi
    B) Bronchioles
    C) Alveoli ✅
    D) Trachea

26. Oxygen is transported in blood by:
    A) Plasma
    B) White blood cells
    C) Hemoglobin ✅
    D) Platelets

27. Which vitamin helps in blood clotting?
    A) Vitamin A
    B) Vitamin B
    C) Vitamin C
    D) Vitamin K ✅

28. Insulin is secreted by:
    A) Alpha cells
    B) Beta cells ✅
    C) Delta cells
    D) Acinar cells

29. Which part of the brain controls posture and balance?
    A) Cerebrum
    B) Cerebellum ✅
    C) Medulla
    D) Pons

30. Which of the following is not a part of the male reproductive system?
    A) Epididymis
    B) Seminal vesicle
    C) Vas deferens
    D) Fallopian tube ✅

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Unit 6: Reproduction

31. Pollination by insects is called:
    A) Anemophily
    B) Hydrophily
    C) Entomophily ✅
    D) Zoophily

32. Which of the following is a fruit?
    A) Tomato ✅
    B) Carrot
    C) Potato
    D) Ginger

33. Double fertilization is a characteristic feature of:
    A) Gymnosperms
    B) Pteridophytes
    C) Angiosperms ✅
    D) Algae

34. Oogenesis begins:
    A) After birth
    B) Before birth ✅
    C) During puberty
    D) At menopause

35. Which hormone triggers ovulation?
    A) FSH
    B) LH ✅
    C) Estrogen
    D) Progesterone

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Unit 7: Genetics and Evolution

36. The law of segregation is also known as:
    A) Law of dominance
    B) Law of purity of gametes ✅
    C) Law of independent assortment
    D) Law of inheritance

37. Down’s syndrome is caused due to:
    A) Mutation
    B) Trisomy of chromosome 21 ✅
    C) Deletion
    D) Monosomy

38. Who proposed the theory of natural selection?
    A) Mendel
    B) Darwin ✅
    C) Lamarck
    D) Hugo de Vries

39. Which of the following is a sex-linked disease?
    A) Diabetes
    B) Color blindness ✅
    C) Asthma
    D) Cancer

40. Blood group is an example of:
    A) Co-dominance ✅
    B) Multiple alleles
    C) Incomplete dominance
    D) All of the above ✅

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Unit 8: Biology in Human Welfare

41. Penicillin was discovered by:
    A) Louis Pasteur
    B) Robert Koch
    C) Alexander Fleming ✅
    D) Jenner

42. The vaccine for tuberculosis is:
    A) MMR
    B) BCG ✅
    C) OPV
    D) DPT

43. Which is a microbial biofertilizer?
    A) Azotobacter ✅
    B) Rhizopus
    C) Penicillium
    D) Yeast

44. The primary host of Plasmodium is:
    A) Man
    B) Mosquito ✅
    C) Dog
    D) Monkey

45. Which disease is caused by HIV?
    A) Tuberculosis
    B) Cancer
    C) AIDS ✅
    D) Influenza

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(Continued in next message: Units 9–12, questions 46–100)
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Great! Here's the final part of the “100 Most Repeated NEET Biology MCQs” — covering the remaining key NEET biology topics from Units 9 to 12 of NCERT Biology (both Class 11 and Class 12).

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Unit 9: Biotechnology and Its Applications

46. Restriction enzymes are also called:
    A) Ligases
    B) Polymerases
    C) Molecular scissors ✅
    D) Helicases

47. Which of the following is used as a vector in recombinant DNA technology?
    A) Plasmid ✅
    B) Nucleus
    C) Lysosome
    D) Ribosome

48. PCR is used to:
    A) Cut DNA
    B) Join DNA
    C) Amplify DNA ✅
    D) Sequence DNA

49. Bt cotton has been genetically modified for:
    A) High yield
    B) Disease resistance
    C) Pest resistance ✅
    D) Better taste

50. Golden rice is rich in:
    A) Iron
    B) Vitamin A ✅
    C) Vitamin C
    D) Calcium

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Unit 10: Ecology and Environment

51. The pyramid of energy is always:
    A) Upright ✅
    B) Inverted
    C) Irregular
    D) Cylindrical

52. Which of the following is a biotic component of the ecosystem?
    A) Water
    B) Light
    C) Plants ✅
    D) Temperature

53. Ozone depletion is mainly caused by:
    A) Greenhouse gases
    B) CFCs ✅
    C) CO₂
    D) NO₂

54. Chipko movement is related to:
    A) Pollution
    B) Wildlife protection
    C) Forest conservation ✅
    D) Waste management

55. The greenhouse effect is due to increase in:
    A) CO₂ ✅
    B) O₂
    C) N₂
    D) H₂

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Unit 11: Biotechnology – Principles and Processes

56. Ti plasmid is used to introduce genes into:
    A) Animals
    B) Bacteria
    C) Plants ✅
    D) Viruses

57. Gel electrophoresis is used to:
    A) Clone DNA
    B) Cut DNA
    C) Separate DNA fragments ✅
    D) Replicate DNA

58. The first recombinant DNA was constructed by:
    A) Stanley Cohen and Herbert Boyer ✅
    B) Watson and Crick
    C) Paul Berg
    D) Kary Mullis

59. Which enzyme joins DNA fragments?
    A) Restriction endonuclease
    B) DNA ligase ✅
    C) Helicase
    D) Topoisomerase

60. Bioreactors are used in:
    A) Cell culture
    B) DNA sequencing
    C) Large-scale production of products ✅
    D) Antibiotic resistance testing

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Unit 12: Human Health and Disease

61. Which immune cells produce antibodies?
    A) T cells
    B) B cells ✅
    C) Macrophages
    D) Neutrophils

62. Which of the following is a non-communicable disease?
    A) Tuberculosis
    B) Typhoid
    C) Cancer ✅
    D) Influenza

63. Malarial parasite is transmitted by:
    A) Male Anopheles
    B) Female Anopheles ✅
    C) Culex
    D) Aedes

64. Which drug is classified as a hallucinogen?
    A) Cocaine
    B) LSD ✅
    C) Heroin
    D) Morphine

65. Antibodies are part of:
    A) Cell-mediated immunity
    B) Innate immunity
    C) Acquired humoral immunity ✅
    D) Passive immunity

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Bonus Questions: Mixed Topics (66–100)

66. Who is known as the father of genetics?
    A) Charles Darwin
    B) Mendel ✅
    C) Hugo de Vries
    D) Watson

67. Which base is found only in RNA?
    A) Thymine
    B) Cytosine
    C) Uracil ✅
    D) Adenine

68. DNA replication is:
    A) Dispersive
    B) Conservative
    C) Semi-conservative ✅
    D) None

69. Who gave the operon model of gene regulation?
    A) Jacob and Monod ✅
    B) Watson and Crick
    C) Beadle and Tatum
    D) Hershey and Chase

70. Blood pressure in a normal adult is:
    A) 120/80 mmHg ✅
    B) 90/70 mmHg
    C) 140/90 mmHg
    D) 100/60 mmHg

71. The pigment responsible for red color in RBCs is:
    A) Myoglobin
    B) Melanin
    C) Hemoglobin ✅
    D) Chlorophyll

72. Turgor pressure is developed due to:
    A) Loss of water
    B) Osmosis ✅
    C) Active transport
    D) Diffusion

73. Glycolysis occurs in the:
    A) Nucleus
    B) Cytoplasm ✅
    C) Mitochondria
    D) Ribosome

74. The end product of glycolysis is:
    A) Pyruvate ✅
    B) Acetyl-CoA
    C) Glucose
    D) NADH

75. During photosynthesis, oxygen is released from:
    A) CO₂
    B) H₂O ✅
    C) Glucose
    D) NADPH

76. Which mineral is essential for chlorophyll formation?
    A) Zinc
    B) Iron
    C) Magnesium ✅
    D) Potassium

77. Which vitamin is synthesized by intestinal bacteria?
    A) Vitamin A
    B) Vitamin K ✅
    C) Vitamin B12
    D) Vitamin D

78. Haemophilia is a:
    A) Autosomal disorder
    B) X-linked recessive disorder ✅
    C) Dominant trait
    D) Y-linked disorder

79. The term gene was coined by:
    A) Mendel
    B) Johannsen ✅
    C) Morgan
    D) Darwin

80. Sickle cell anemia is caused by mutation in the gene coding for:
    A) Hemoglobin ✅
    B) Insulin
    C) Myoglobin
    D) Antibody

81. The largest gland in the human body is:
    A) Thyroid
    B) Liver ✅
    C) Pancreas
    D) Skin

82. The functional unit of the nervous system is:
    A) Brain
    B) Neuron ✅
    C) Nerve
    D) Synapse

83. Which hormone regulates calcium levels in blood?
    A) Thyroxine
    B) Parathyroid hormone ✅
    C) Insulin
    D) Aldosterone

84. Which process converts ammonia to urea?
    A) Glycolysis
    B) Urea cycle ✅
    C) Beta oxidation
    D) Transamination

85. The term biodiversity was coined by:
    A) Walter G. Rosen ✅
    B) Edward O. Wilson
    C) Ernst Mayr
    D) Linnaeus

86. The lungs are covered by:
    A) Peritoneum
    B) Pleura ✅
    C) Pericardium
    D) Meninges

87. Immunization protects against:
    A) Nutritional deficiency
    B) Genetic disorders
    C) Infectious diseases ✅
    D) Degenerative diseases

88. The human genome project was completed in:
    A) 1990
    B) 2000
    C) 2003 ✅
    D) 2010

89. Which hormone promotes seed dormancy?
    A) Gibberellin
    B) Cytokinin
    C) Abscisic acid ✅
    D) Auxin

90. Which hormone induces fruit ripening?
    A) Ethylene ✅
    B) Cytokinin
    C) Auxin
    D) ABA

91. Prions are composed of:
    A) RNA
    B) DNA
    C) Protein ✅
    D) Lipids

92. The excretory unit of earthworm is:
    A) Kidney
    B) Nephron
    C) Nephridia ✅
    D) Flame cells

93. Which vitamin is synthesized in the skin using sunlight?
    A) Vitamin A
    B) Vitamin C
    C) Vitamin D ✅
    D) Vitamin K

94. Antibiotic resistance is an example of:
    A) Mutation ✅
    B) Selection
    C) Speciation
    D) Evolution

95. Asexual reproduction is common in:
    A) Mammals
    B) Birds
    C) Protists ✅
    D) Reptiles

96. Which organ secretes ADH?
    A) Pituitary gland ✅
    B) Adrenal gland
    C) Thyroid
    D) Pancreas

97. Which of the following helps in clotting of blood?
    A) WBC
    B) Platelets ✅
    C) RBC
    D) Plasma

98. Cuscuta is a:
    A) Autotroph
    B) Partial parasite
    C) Total parasite ✅
    D) Saprophyte

99. The embryo with 8 blastomeres is called:
    A) Zygote
    B) Morula ✅
    C) Blastocyst
    D) Gastrula

100. The site of fertilization in humans is:
     A) Ovary
     B) Uterus
     C) Fallopian tube ✅
     D) Cervix

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