neet 2020 prep

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NEET 2020 Biology MCQs (Q46–135)

Q46. Which of the following is correct regarding enzyme action?
  • A) Enzymes are consumed
  • B) Enzymes increase activation energy
  • C) Enzymes lower activation energy
  • D) Enzymes stop reactions
Answer: C

Explanation: Enzymes act as catalysts and lower activation energy, speeding up reactions.
Q47. Which hormone regulates blood sugar?
  • A) Thyroxine
  • B) Insulin
  • C) Adrenaline
  • D) Estrogen
Answer: B

Explanation: Insulin controls glucose levels by promoting uptake into cells.
Q48. Functional unit of kidney is:
  • A) Neuron
  • B) Nephron
  • C) Alveoli
  • D) Villi
Answer: B

Explanation: Nephron filters blood and forms urine.
Q49. Photosynthesis occurs in:
  • A) Mitochondria
  • B) Chloroplast
  • C) Nucleus
  • D) Ribosome
Answer: B

Explanation: Chloroplast contains chlorophyll and performs photosynthesis.
Q50. Genetic material is:
  • A) Protein
  • B) Lipid
  • C) DNA
  • D) Carbohydrate
Answer: C

Explanation: DNA stores genetic information.
Q51. Human heart has how many chambers?
  • A) 2
  • B) 3
  • C) 4
  • D) 5
Answer: C

Explanation: Two atria and two ventricles.
Q52. Site of protein synthesis:
  • A) Ribosome
  • B) Golgi
  • C) Lysosome
  • D) Nucleus
Answer: A

Explanation: Ribosomes translate mRNA into proteins.
Q53. Which vitamin is produced in sunlight?
  • A) A
  • B) B
  • C) C
  • D) D
Answer: D

Explanation: Vitamin D is synthesized in skin via sunlight.
Q54. Blood group universal donor:
  • A) A
  • B) B
  • C) AB
  • D) O
Answer: D

Explanation: O group lacks antigens.
Q55. Plant transport tissue:
  • A) Xylem & Phloem
  • B) Collenchyma
  • C) Parenchyma
  • D) Sclerenchyma
Answer: A

Explanation: Xylem transports water; phloem transports food.

NEET 2020 Biology MCQs (Q46–135)

Q46. Which of the following is correct regarding enzyme action?
  • A) Enzymes are consumed
  • B) Enzymes increase activation energy
  • C) Enzymes lower activation energy
  • D) Enzymes stop reactions
Answer: C

Explanation: Enzymes act as catalysts and lower activation energy, speeding up reactions.
Q47. Which hormone regulates blood sugar?
  • A) Thyroxine
  • B) Insulin
  • C) Adrenaline
  • D) Estrogen
Answer: B

Explanation: Insulin controls glucose levels by promoting uptake into cells.
Q48. Functional unit of kidney is:
  • A) Neuron
  • B) Nephron
  • C) Alveoli
  • D) Villi
Answer: B

Explanation: Nephron filters blood and forms urine.
Q49. Photosynthesis occurs in:
  • A) Mitochondria
  • B) Chloroplast
  • C) Nucleus
  • D) Ribosome
Answer: B

Explanation: Chloroplast contains chlorophyll and performs photosynthesis.
Q50. Genetic material is:
  • A) Protein
  • B) Lipid
  • C) DNA
  • D) Carbohydrate
Answer: C

Explanation: DNA stores genetic information.
Q51. Human heart has how many chambers?
  • A) 2
  • B) 3
  • C) 4
  • D) 5
Answer: C

Explanation: Two atria and two ventricles.
Q52. Site of protein synthesis:
  • A) Ribosome
  • B) Golgi
  • C) Lysosome
  • D) Nucleus
Answer: A

Explanation: Ribosomes translate mRNA into proteins.
Q53. Which vitamin is produced in sunlight?
  • A) A
  • B) B
  • C) C
  • D) D
Answer: D

Explanation: Vitamin D is synthesized in skin via sunlight.
Q54. Blood group universal donor:
  • A) A
  • B) B
  • C) AB
  • D) O
Answer: D

Explanation: O group lacks antigens.
Q55. Plant transport tissue:
  • A) Xylem & Phloem
  • B) Collenchyma
  • C) Parenchyma
  • D) Sclerenchyma
Answer: A

Explanation: Xylem transports water; phloem transports food.
Q66. Which part of brain controls balance?
  • A) Cerebrum
  • B) Cerebellum
  • C) Medulla
  • D) Spinal cord
Answer: B

Explanation: Cerebellum maintains posture and balance.
Q67. Functional unit of nervous system:
  • A) Neuron
  • B) Axon
  • C) Dendrite
  • D) Brain
Answer: A

Explanation: Neuron transmits nerve impulses.
Q68. Which organ stores urine?
  • A) Kidney
  • B) Ureter
  • C) Bladder
  • D) Urethra
Answer: C

Explanation: Urinary bladder stores urine temporarily.
Q69. Which vitamin is antioxidant?
  • A) Vitamin A
  • B) Vitamin C
  • C) Vitamin D
  • D) Vitamin K
Answer: B

Explanation: Vitamin C protects cells from damage.
Q70. Which tissue connects bone to bone?
  • A) Tendon
  • B) Ligament
  • C) Cartilage
  • D) Muscle
Answer: B

Explanation: Ligaments connect bones together.
Q71. Site of fertilization in humans:
  • A) Uterus
  • B) Ovary
  • C) Fallopian tube
  • D) Cervix
Answer: C

Explanation: Fertilization occurs in fallopian tube.
Q72. Which hormone controls growth?
  • A) Insulin
  • B) Growth hormone
  • C) Thyroxine
  • D) Adrenaline
Answer: B

Explanation: Growth hormone regulates body development.
Q73. Which blood group is universal recipient?
  • A) A
  • B) B
  • C) AB
  • D) O
Answer: C

Explanation: AB can receive from all groups.
Q74. Which organ pumps blood?
  • A) Lung
  • B) Brain
  • C) Heart
  • D) Liver
Answer: C

Explanation: Heart circulates blood in body.
Q75. Which process forms gametes?
  • A) Mitosis
  • B) Meiosis
  • C) Binary fission
  • D) Budding
Answer: B

Explanation: Meiosis produces haploid gametes.
Q76. Which organ detoxifies chemicals?
  • A) Kidney
  • B) Liver
  • C) Heart
  • D) Lung
Answer: B

Explanation: Liver detoxifies harmful substances.
Q77. Which structure controls entry to cell?
  • A) Nucleus
  • B) Cell membrane
  • C) Cytoplasm
  • D) Ribosome
Answer: B

Explanation: Cell membrane regulates entry and exit.
Q78. Which disease is caused by virus?
  • A) Tuberculosis
  • B) Malaria
  • C) Dengue
  • D) Typhoid
Answer: C

Explanation: Dengue is caused by virus transmitted by mosquito.
Q79. Which part helps in breathing?
  • A) Heart
  • B) Lung
  • C) Kidney
  • D) Brain
Answer: B

Explanation: Lungs exchange oxygen and carbon dioxide.
Q80. Which blood cells help clotting?
  • A) RBC
  • B) WBC
  • C) Platelets
  • D) Plasma
Answer: C

Explanation: Platelets help in blood clotting.
Q81. Which structure carries food in plants?
  • A) Xylem
  • B) Phloem
  • C) Root
  • D) Stem
Answer: B

Explanation: Phloem transports food.
Q82. Which gas is used in respiration?
  • A) CO2
  • B) Oxygen
  • C) Nitrogen
  • D) Hydrogen
Answer: B

Explanation: Oxygen is essential for respiration.
Q83. Which organ controls thinking?
  • A) Heart
  • B) Brain
  • C) Lung
  • D) Liver
Answer: B

Explanation: Brain controls thinking and intelligence.
Q84. Which part absorbs nutrients?
  • A) Stomach
  • B) Small intestine
  • C) Large intestine
  • D) Liver
Answer: B

Explanation: Small intestine absorbs digested nutrients.
Q85. Which structure is DNA carrier?
  • A) Gene
  • B) Chromosome
  • C) Protein
  • D) Lipid
Answer: B

Explanation: Chromosomes carry DNA.
Q86. Which cell organelle modifies proteins?
  • A) Ribosome
  • B) Golgi apparatus
  • C) Lysosome
  • D) Nucleus
Answer: B

Explanation: Golgi apparatus modifies and packages proteins.
Q87. Which element is most abundant in living organisms?
  • A) Oxygen
  • B) Carbon
  • C) Nitrogen
  • D) Hydrogen
Answer: B

Explanation: Carbon forms the backbone of organic molecules.
Q88. Which process removes nitrogenous waste?
  • A) Respiration
  • B) Digestion
  • C) Excretion
  • D) Circulation
Answer: C

Explanation: Excretion removes metabolic wastes.
Q89. Which organ produces insulin?
  • A) Liver
  • B) Pancreas
  • C) Kidney
  • D) Brain
Answer: B

Explanation: Pancreas secretes insulin to regulate glucose.
Q90. Which part carries impulses away from cell body?
  • A) Dendrite
  • B) Axon
  • C) Nucleus
  • D) Synapse
Answer: B

Explanation: Axon transmits impulses away from neuron body.
Q91. Which part of plant prepares food?
  • A) Root
  • B) Stem
  • C) Leaf
  • D) Flower
Answer: C

Explanation: Leaves perform photosynthesis.
Q92. Which vitamin helps clotting?
  • A) Vitamin A
  • B) Vitamin B
  • C) Vitamin C
  • D) Vitamin K
Answer: D

Explanation: Vitamin K is essential for blood clotting.
Q93. Which organ helps in hearing?
  • A) Eye
  • B) Ear
  • C) Nose
  • D) Skin
Answer: B

Explanation: Ear detects sound vibrations.
Q94. Which cell organelle contains enzymes for digestion?
  • A) Lysosome
  • B) Ribosome
  • C) Nucleus
  • D) Golgi
Answer: A

Explanation: Lysosomes digest waste materials.
Q95. Which process produces identical cells?
  • A) Meiosis
  • B) Mitosis
  • C) Fertilization
  • D) Mutation
Answer: B

Explanation: Mitosis produces identical daughter cells.
Q96. Which gas is released during respiration?
  • A) Oxygen
  • B) Carbon dioxide
  • C) Nitrogen
  • D) Hydrogen
Answer: B

Explanation: CO₂ is a waste product of respiration.
Q97. Which organ controls hormones?
  • A) Heart
  • B) Brain
  • C) Lung
  • D) Kidney
Answer: B

Explanation: Brain regulates endocrine glands.
Q98. Which tissue stores fat?
  • A) Muscle
  • B) Adipose
  • C) Nervous
  • D) Connective
Answer: B

Explanation: Adipose tissue stores fat.
Q99. Which organ helps in vision?
  • A) Eye
  • B) Ear
  • C) Nose
  • D) Skin
Answer: A

Explanation: Eyes detect light and enable vision.
Q100. Which structure protects brain?
  • A) Rib
  • B) Skull
  • C) Vertebrae
  • D) Pelvis
Answer: B

Explanation: Skull protects the brain.
Q101. Which system transports oxygen?
  • A) Digestive
  • B) Respiratory
  • C) Circulatory
  • D) Nervous
Answer: C

Explanation: Circulatory system carries oxygen via blood.
Q102. Which part controls involuntary actions?
  • A) Cerebrum
  • B) Cerebellum
  • C) Medulla
  • D) Spinal cord
Answer: C

Explanation: Medulla controls involuntary actions.
Q103. Which organ helps digestion?
  • A) Liver
  • B) Heart
  • C) Brain
  • D) Lung
Answer: A

Explanation: Liver produces bile aiding digestion.
Q104. Which structure connects muscles to bones?
  • A) Ligament
  • B) Tendon
  • C) Cartilage
  • D) Joint
Answer: B

Explanation: Tendons attach muscles to bones.
Q105. Which organ pumps oxygenated blood?
  • A) Right atrium
  • B) Left ventricle
  • C) Right ventricle
  • D) Left atrium
Answer: B

Explanation: Left ventricle pumps oxygen-rich blood to body.
Q106. Which gas is essential for photosynthesis?
  • A) Oxygen
  • B) Carbon dioxide
  • C) Nitrogen
  • D) Hydrogen
Answer: B

Explanation: CO₂ is used to form glucose during photosynthesis.
Q107. Which organ controls body temperature?
  • A) Liver
  • B) Skin
  • C) Heart
  • D) Brain
Answer: B

Explanation: Skin regulates temperature through sweating.
Q108. Which structure forms ribosomes?
  • A) Nucleus
  • B) Nucleolus
  • C) Cytoplasm
  • D) Golgi
Answer: B

Explanation: Nucleolus produces ribosomes.
Q109. Which process releases energy?
  • A) Photosynthesis
  • B) Respiration
  • C) Transpiration
  • D) Absorption
Answer: B

Explanation: Respiration releases energy from glucose.
Q110. Which organ removes urea?
  • A) Liver
  • B) Kidney
  • C) Heart
  • D) Lung
Answer: B

Explanation: Kidneys remove urea via urine.
Q111. Which system controls body activities?
  • A) Digestive
  • B) Nervous
  • C) Respiratory
  • D) Circulatory
Answer: B

Explanation: Nervous system coordinates body functions.
Q112. Which organ produces hormones?
  • A) Glands
  • B) Bones
  • C) Muscles
  • D) Skin
Answer: A

Explanation: Endocrine glands secrete hormones.
Q113. Which part of plant transports water?
  • A) Phloem
  • B) Xylem
  • C) Leaf
  • D) Root
Answer: B

Explanation: Xylem carries water upward.
Q114. Which cell lacks nucleus?
  • A) WBC
  • B) RBC
  • C) Neuron
  • D) Muscle
Answer: B

Explanation: Mature RBCs lack nucleus.
Q115. Which organ is part of respiratory system?
  • A) Lung
  • B) Kidney
  • C) Liver
  • D) Heart
Answer: A

Explanation: Lungs are involved in respiration.
Q116. Which process forms zygote?
  • A) Meiosis
  • B) Fertilization
  • C) Mitosis
  • D) Mutation
Answer: B

Explanation: Fertilization fuses gametes to form zygote.
Q117. Which organ stores bile?
  • A) Liver
  • B) Gall bladder
  • C) Pancreas
  • D) Kidney
Answer: B

Explanation: Gall bladder stores bile.
Q118. Which process occurs in chloroplast?
  • A) Respiration
  • B) Photosynthesis
  • C) Digestion
  • D) Excretion
Answer: B

Explanation: Chloroplast performs photosynthesis.
Q119. Which vitamin prevents scurvy?
  • A) A
  • B) B
  • C) C
  • D) D
Answer: C

Explanation: Vitamin C prevents scurvy.
Q120. Which organ produces urine?
  • A) Liver
  • B) Kidney
  • C) Bladder
  • D) Lung
Answer: B

Explanation: Kidneys produce urine.
Q121. Which system fights infection?
  • A) Digestive
  • B) Immune
  • C) Respiratory
  • D) Circulatory
Answer: B

Explanation: Immune system protects body.
Q122. Which organ controls reflex actions?
  • A) Brain
  • B) Spinal cord
  • C) Heart
  • D) Lung
Answer: B

Explanation: Spinal cord controls reflexes.
Q123. Which process loses water from leaves?
  • A) Respiration
  • B) Transpiration
  • C) Digestion
  • D) Absorption
Answer: B

Explanation: Transpiration is water loss from leaves.
Q124. Which organ helps smell?
  • A) Eye
  • B) Nose
  • C) Ear
  • D) Skin
Answer: B

Explanation: Nose detects smell.
Q125. Which nutrient builds body?
  • A) Carbohydrate
  • B) Protein
  • C) Fat
  • D) Vitamin
Answer: B

Explanation: Proteins help growth and repair.
Q126. Which organ stores food in plants?
  • A) Root
  • B) Stem
  • C) Leaf
  • D) All
Answer: D

Explanation: Food storage occurs in different plant parts.
Q127. Which organ controls coordination?
  • A) Brain
  • B) Heart
  • C) Liver
  • D) Kidney
Answer: A

Explanation: Brain coordinates body functions.
Q128. Which structure supports plant?
  • A) Stem
  • B) Leaf
  • C) Flower
  • D) Fruit
Answer: A

Explanation: Stem supports plant body.
Q129. Which process makes food?
  • A) Respiration
  • B) Photosynthesis
  • C) Digestion
  • D) Excretion
Answer: B

Explanation: Photosynthesis produces food in plants.
Q130. Which organ controls emotions?
  • A) Brain
  • B) Heart
  • C) Liver
  • D) Lung
Answer: A

Explanation: Brain processes emotions.
Q131. Which cell carries oxygen?
  • A) WBC
  • B) RBC
  • C) Platelet
  • D) Plasma
Answer: B

Explanation: RBC carries oxygen via hemoglobin.
Q132. Which organ produces enzymes?
  • A) Pancreas
  • B) Kidney
  • C) Heart
  • D) Lung
Answer: A

Explanation: Pancreas secretes digestive enzymes.
Q133. Which organ protects lungs?
  • A) Skull
  • B) Rib cage
  • C) Pelvis
  • D) Spine
Answer: B

Explanation: Rib cage protects lungs.
Q134. Which organ helps taste?
  • A) Tongue
  • B) Nose
  • C) Eye
  • D) Skin
Answer: A

Explanation: Tongue has taste buds.
Q135. Which system removes waste?
  • A) Digestive
  • B) Excretory
  • C) Respiratory
  • D) Nervous
Answer: B

Explanation: Excretory system removes waste products.

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