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NEET 2025 : Biology MCQ Question with Answer 1 - 55

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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

Which of the following is the smallest unit of the genetic material?

a) Codon
b) Gene
c) Nucleotide
d) Chromosome
Answer: c) Nucleotide

Which of the following is an example of a symbiotic nitrogen-fixing bacterium?

a) Nitrosomonas
b) Rhizobium
c) Azotobacter
d) Clostridium
Answer: b) Rhizobium

Which hormone regulates the basal metabolic rate (BMR) in the human body?

a) Thyroxine
b) Insulin
c) Glucagon
d) Cortisol
Answer: a) Thyroxine

Which of the following processes occurs during meiosis but not during mitosis?

a) DNA replication
b) Crossing over
c) Cytokinesis
d) Chromosome alignment
Answer: b) Crossing over

What is the role of antibodies in the immune system?

a) Produce red blood cells
b) Bind to antigens to neutralize them
c) Destroy cancer cells directly
d) Stimulate hormone release
Answer: b) Bind to antigens to neutralize them

Which type of connective tissue stores fat in the human body?

a) Areolar tissue
b) Adipose tissue
c) Fibrous connective tissue
d) Cartilage
Answer: b) Adipose tissue

Which of the following is an example of an autosomal recessive disorder?

a) Huntington's disease
b) Cystic fibrosis
c) Down syndrome
d) Turner syndrome
Answer: b) Cystic fibrosis

Which of the following is the causative agent of malaria?

a) Trypanosoma
b) Plasmodium
c) Leishmania
d) Wuchereria
Answer: b) Plasmodium

What is the function of xylem in plants?

a) Transport of water and minerals
b) Transport of sugars
c) Photosynthesis
d) Storage of food
Answer: a) Transport of water and minerals

Which part of the brain is responsible for regulating heart rate and breathing?

a) Cerebellum
b) Medulla oblongata
c) Hypothalamus
d) Cerebrum
Answer: b) Medulla oblongata

In which phase of the cell cycle does the cell grow and prepare for DNA replication?

a) G₁ phase
b) G₂ phase
c) S phase
d) M phase
Answer: a) G₁ phase

Which of the following is an example of a vestigial structure in humans?

a) Wisdom teeth
b) Heart valves
c) Adrenal gland
d) Salivary glands
Answer: a) Wisdom teeth

Which organelle is involved in the synthesis of lipids?

a) Rough endoplasmic reticulum
b) Smooth endoplasmic reticulum
c) Golgi apparatus
d) Ribosome
Answer: b) Smooth endoplasmic reticulum

Which of the following is a water-soluble vitamin?

a) Vitamin A
b) Vitamin D
c) Vitamin C
d) Vitamin E
Answer: c) Vitamin C

Which one of the following is a greenhouse gas?

a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Hydrogen
Answer: c) Carbon dioxide

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