NEET 2025 Biology MCQ Questions with Answer for Practice:
Which of the following is the primary energy currency in living cells?
a) NADH
b) ATP
c) GTP
d) FADH₂
Answer: b) ATP
Which enzyme is responsible for the replication of DNA?
a) DNA ligase
b) DNA polymerase
c) Helicase
d) RNA polymerase
Answer: b) DNA polymerase
Which of the following plant hormones is responsible for cell elongation?
a) Auxin
b) Cytokinin
c) Ethylene
d) Abscisic acid
Answer: a) Auxin
The respiratory quotient (RQ) for glucose is:
a) 0.7
b) 1
c) 1.2
d) 0.8
Answer: b) 1
Which type of immunity is provided by vaccines?
a) Active immunity
b) Passive immunity
c) Innate immunity
d) Natural immunity
Answer: a) Active immunity
In which stage of the cell cycle does DNA replication occur?
a) G₁ phase
b) G₂ phase
c) S phase
d) M phase
Answer: c) S phase
The functional unit of the kidney is:
a) Neuron
b) Nephron
c) Hepatocyte
d) Alveolus
Answer: b) Nephron
Which organelle is responsible for protein synthesis?
a) Mitochondria
b) Ribosome
c) Golgi apparatus
d) Lysosome
Answer: b) Ribosome
Which of the following is a vestigial organ in humans?
a) Spleen
b) Appendix
c) Pancreas
d) Heart
Answer: b) Appendix
Which gas is released during photosynthesis?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
Answer: b) Oxygen
Which of the following is a monosaccharide?
a) Sucrose
b) Lactose
c) Glucose
d) Maltose
Answer: c) Glucose
The Bowman’s capsule is found in which part of the kidney?
a) Renal cortex
b) Renal medulla
c) Renal pelvis
d) Ureter
Answer: a) Renal cortex
Which structure in the plant root is responsible for water absorption?
a) Cortex
b) Root hairs
c) Endodermis
d) Phloem
Answer: b) Root hairs
Which of the following is involved in the clotting of blood?
a) Hemoglobin
b) Platelets
c) Leukocytes
d) Erythrocytes
Answer: b) Platelets
Which among the following is a chromosomal disorder?
a) Turner syndrome
b) Sickle cell anemia
c) Hemophilia
d) Cystic fibrosis
Answer: a) Turner syndrome
What is the site of glycolysis in the cell?
a) Mitochondria
b) Cytoplasm
c) Nucleus
d) Endoplasmic reticulum
Answer: b) Cytoplasm
Which of the following is a bacterial disease?
a) Tuberculosis
b) Malaria
c) Influenza
d) AIDS
Answer: a) Tuberculosis
The theory of natural selection was proposed by:
a) Gregor Mendel
b) Jean-Baptiste Lamarck
c) Charles Darwin
d) Alfred Wallace
Answer: c) Charles Darwin
Which structure is known as the "powerhouse of the cell"?
a) Ribosome
b) Mitochondria
c) Lysosome
d) Nucleus
Answer: b) Mitochondria
The breakdown of fat into fatty acids and glycerol is called:
a) Glycolysis
b) Lipolysis
c) Gluconeogenesis
d) Beta-oxidation
Answer: b) Lipolysis
Which of the following organisms is considered a primary producer in a food chain?
a) Herbivores
b) Carnivores
c) Green plants
d) Decomposers
Answer: c) Green plants
Which of the following is the largest part of the human brain?
a) Cerebrum
b) Cerebellum
c) Medulla oblongata
d) Pons
Answer: a) Cerebrum
Which of the following is a characteristic of dicots?
a) Parallel venation
b) Fibrous root system
c) Two cotyledons
d) Flowers in multiples of three
Answer: c) Two cotyledons
C4 plants are more efficient in photosynthesis because:
a) They absorb more water
b) They store more starch
c) They reduce photorespiration
d) They have larger leaves
Answer: c) They reduce photorespiration
Which vitamin is essential for blood clotting?
a) Vitamin C
b) Vitamin K
c) Vitamin D
d) Vitamin B12
Answer: b) Vitamin K
Which of the following organelles is known as the “suicide bag” of the cell?
a) Golgi apparatus
b) Mitochondria
c) Lysosomes
d) Nucleus
Answer: c) Lysosomes
Which hormone is known as the "stress hormone"?
a) Insulin
b) Glucagon
c) Cortisol
d) Thyroxine
Answer: c) Cortisol
Which of the following is the excretory organ in earthworms?
a) Flame cells
b) Nephridia
c) Malpighian tubules
d) Kidneys
Answer: b) Nephridia
Which of the following blood vessels carries oxygenated blood?
a) Pulmonary artery
b) Pulmonary vein
c) Superior vena cava
d) Inferior vena cava
Answer: b) Pulmonary vein
Which is the first step in the process of protein synthesis?
a) Transcription
b) Translation
c) Replication
d) Mutation
Answer: a) Transcription
Which of the following is a photosynthetic pigment in plants?
a) Chlorophyll
b) Hemoglobin
c) Myoglobin
d) Keratin
Answer: a) Chlorophyll
Which organ in the human body is primarily responsible for the detoxification of drugs?
a) Kidney
b) Liver
c) Lungs
d) Heart
Answer: b) Liver
The ABO blood group system is an example of:
a) Complete dominance
b) Incomplete dominance
c) Multiple alleles
d) Polygenic inheritance
Answer: c) Multiple alleles
The process of programmed cell death is called:
a) Necrosis
b) Apoptosis
c) Mitosis
d) Meiosis
Answer: b) Apoptosis
Which of the following is the main nitrogenous waste excreted by humans?
a) Ammonia
b) Uric acid
c) Urea
d) Nitrites
Answer: c) Urea
Which type of muscle is responsible for voluntary movements in the human body?
a) Smooth muscle
b) Cardiac muscle
c) Skeletal muscle
d) Visceral muscle
Answer: c) Skeletal muscle
Which of the following structures controls the movement of food from the stomach to the small intestine?
a) Pyloric sphincter
b) Cardiac sphincter
c) Ileum
d) Rectum
Answer: a) Pyloric sphincter
The genetic disorder Down syndrome is caused by:
a) Trisomy of chromosome 21
b) Monosomy of chromosome X
c) Mutation in chromosome 15
d) Deletion of chromosome 18
Answer: a) Trisomy of chromosome 21
Which of the following is a function of bile in digestion?
a) Digestion of proteins
b) Emulsification of fats
c) Breakdown of carbohydrates
d) Absorption of vitamins
Answer: b) Emulsification of fats
The structure that connects bone to bone is called:
a) Tendon
b) Ligament
c) Cartilage
d) Synovial fluid
Answer: b) Ligament