Biology MCQ Series for NEET/Board Exams: Part 3 (Questions 61 to 90)

 

 

Biology MCQs (61–90) with Answers and Reasons focus on important NCERT-based concepts from Ecology, Evolution, Genetics, Plant Physiology, and Human Health.

This objective practice set is highly helpful for NEET Biology preparation and also supports revision for school-level examinations and other MCQ-based competitive tests.
Solving MCQs regularly improves concept clarity, strengthens memory-based chapters, and increases speed and accuracy during exams.

61. The process of movement of water through a semipermeable membrane is called:

Correct Answer: B Reason: Osmosis is the movement of water from dilute to concentrated solution through a semipermeable membrane.

62. The study of inheritance is called:

Correct Answer: C Reason: Genetics deals with heredity and variation in living organisms.

63. The “Father of Genetics” is:

Correct Answer: D Reason: Gregor Mendel discovered the basic laws of inheritance using pea plants.

64. The scientific name of human is:

Correct Answer: A Reason: The binomial name of modern humans is Homo sapiens.

65. Which of the following is a communicable disease?

Correct Answer: B Reason: Tuberculosis spreads through air droplets and is communicable.

66. The deficiency of vitamin C causes:

Correct Answer: C Reason: Vitamin C deficiency leads to scurvy with bleeding gums and poor healing.

67. The blood pressure is measured using:

Correct Answer: D Reason: Sphygmomanometer is the standard instrument to measure blood pressure.

68. The unit of heredity is:

Correct Answer: B Reason: Gene is the functional unit of heredity responsible for traits.

69. The organism that prepares its own food is called:

Correct Answer: A Reason: Autotrophs synthesize their own food using sunlight or chemicals.

70. The process of breakdown of glucose without oxygen is:

Correct Answer: D Reason: Anaerobic respiration occurs in absence of oxygen and releases less energy.

71. The study of interaction between organisms and environment is:

Correct Answer: C Reason: Ecology explains relationships between living organisms and their surroundings.

72. The movement of molecules from higher concentration to lower concentration is:

Correct Answer: A Reason: Diffusion is the passive movement of particles along concentration gradient.

73. Which of the following is the main photosynthetic pigment?

Correct Answer: D Reason: Chlorophyll a is the primary pigment that captures light energy.

74. The process of conversion of nitrogen into usable form by bacteria is:

Correct Answer: B Reason: Nitrogen fixation converts atmospheric nitrogen into ammonia for plants.

75. The genetic makeup of an organism is called:

Correct Answer: A Reason: Genotype refers to the genetic constitution responsible for traits.

76. The physical appearance of an organism is called:

Correct Answer: B Reason: Phenotype is the observable expression of genes influenced by environment.

77. The organism that feeds on dead organic matter is:

Correct Answer: D Reason: Saprophytes obtain nutrients from dead and decaying organisms.

78. The place where fertilization occurs in human females is:

Correct Answer: B Reason: Fertilization usually takes place in the fallopian tube (oviduct).

79. The disease caused by deficiency of iodine is:

Correct Answer: C Reason: Iodine deficiency affects thyroid gland and causes goitre.

80. Which of these is a vector-borne disease?

Correct Answer: D Reason: Malaria is transmitted by female Anopheles mosquito (vector).

81. Which of the following is a greenhouse gas?

Correct Answer: B Reason: Carbon dioxide traps heat in atmosphere and contributes to greenhouse effect.

82. The process of water cycle includes:

Correct Answer: D Reason: Water cycle involves evaporation, condensation, and precipitation continuously.

83. The organism at the first trophic level is:

Correct Answer: A Reason: Producers make food and form the base of food chain.

84. DNA is mainly found in:

Correct Answer: B Reason: In eukaryotes, DNA is primarily stored in the nucleus as chromosomes.

85. The process of formation of urine occurs in:

Correct Answer: A Reason: Nephrons filter blood and form urine in kidneys.

86. The fluid found inside plant cell vacuole is called:

Correct Answer: D Reason: Vacuoles contain cell sap which helps maintain turgor pressure.

87. The microorganism used in making curd is:

Correct Answer: B Reason: Lactobacillus bacteria convert milk sugar into lactic acid to form curd.

88. The main function of stomata is:

Correct Answer: A Reason: Stomata regulate gaseous exchange and water vapour loss from leaves.

89. The term “survival of the fittest” is related to:

Correct Answer: C Reason: Natural selection favors organisms with beneficial traits for survival.

90. The “Father of Evolution” is commonly associated with:

Correct Answer: A Reason: Charles Darwin proposed the theory of evolution by natural selection.

Biology MCQs (61–90) FAQs

1. Which chapters are covered in Biology MCQs (61–90)?
This set covers osmosis and diffusion, basic genetics terms, ecology concepts, evolution basics, and human health topics.

2. Are these Biology MCQs based on NCERT?
Yes, these questions are mostly NCERT concept-based and help in quick revision for NEET level preparation.

3. Do these questions include reasons for correct answers?
Yes, each question includes the correct answer along with a short “Reason” for conceptual clarity.

4. How many MCQs should be practiced daily for Biology?
Students can start with 30–50 MCQs daily and increase gradually based on their revision schedule.

5. Which topics should be revised after this part?
Revise genetics laws, ecological terms, evolution theory, and plant transport mechanisms for better performance.

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