Biology MCQs – Set 3: High-Level Questions for UPSC/PSC/SSC CGL Prep

Which part of the brain controls hunger and thirst?
(A) Cerebrum
(B) Cerebellum
(C) Medulla
(D) Hypothalamus
Answer: (D)
Which type of muscles are found in the walls of internal organs?
(A) Skeletal
(B) Cardiac
(C) Smooth
(D) Voluntary
Answer: (C)
Which part of the eye controls the amount of light entering?
(A) Retina
(B) Iris
(C) Cornea
(D) Lens
Answer: (B)
Which element is required for the synthesis of thyroxine?
(A) Iron
(B) Iodine
(C) Zinc
(D) Calcium
Answer: (B)
The color of human skin is due to –
(A) Hemoglobin
(B) Keratin
(C) Melanin
(D) Myosin
Answer: (C)
What is the basic unit of heredity?
(A) DNA
(B) Gene
(C) Chromosome
(D) Nucleus
Answer: (B)
What is the function of red blood cells?
(A) Fight infection
(B) Clot blood
(C) Carry oxygen
(D) Regulate pH
Answer: (C)
Which vitamin is synthesized in the skin with sunlight?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin D
(D) Vitamin K
Answer: (C)
The process by which green plants make food is –
(A) Transpiration
(B) Respiration
(C) Photosynthesis
(D) Digestion
Answer: (C)
The functional unit of the nervous system is –
(A) Neuron
(B) Axon
(C) Dendrite
(D) Synapse
Answer: (A)
Which blood vessels carry blood away from the heart?
(A) Veins
(B) Arteries
(C) Capillaries
(D) Venules
Answer: (B)
What is the largest organ in the human body?
(A) Liver
(B) Skin
(C) Lungs
(D) Brain
Answer: (B)
Which vitamin prevents scurvy?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
Answer: (C)
Which organ removes nitrogenous wastes from the blood?
(A) Liver
(B) Kidney
(C) Spleen
(D) Lungs
Answer: (B)
The process of inhaling oxygen and exhaling carbon dioxide is called –
(A) Respiration
(B) Digestion
(C) Circulation
(D) Breathing
Answer: (D)
Which part of the flower develops into fruit?
(A) Ovary
(B) Anther
(C) Petal
(D) Sepal
Answer: (A)
What is the normal pH of human saliva?
(A) 4–5
(B) 5–6
(C) 6–7
(D) 6.5–7.5
Answer: (D)
Which protein helps in blood clotting?
(A) Hemoglobin
(B) Fibrinogen
(C) Insulin
(D) Albumin
Answer: (B)
Which enzyme is present in gastric juice?
(A) Amylase
(B) Pepsin
(C) Lipase
(D) Trypsin
Answer: (B)
The outermost layer of skin is –
(A) Dermis
(B) Endodermis
(C) Epidermis
(D) Hypodermis
Answer: (C)
What is the full form of DNA?
(A) Deoxyribonucleic Acid
(B) Deoxyribonitric Acid
(C) Dinitronucleic Acid
(D) Deoxynucleic Acid
Answer: (A)
Which hormone is known as the ‘stress hormone’?
(A) Adrenaline
(B) Thyroxine
(C) Insulin
(D) Estrogen
Answer: (A)
What is the unit of heredity located on chromosomes?
(A) Enzyme
(B) Ribosome
(C) Gene
(D) Mitochondria
Answer: (C)
The blood vessel that brings blood to the kidneys is –
(A) Renal vein
(B) Renal artery
(C) Aorta
(D) Vena cava
Answer: (B)
The disease caused by the bite of a rabid animal is –
(A) Anthrax
(B) Malaria
(C) Rabies
(D) Dengue
Answer: (C)
The organ responsible for filtration of blood is –
(A) Liver
(B) Spleen
(C) Kidney
(D) Heart
Answer: (C)
Which vitamin is necessary for vision?
(A) Vitamin A
(B) Vitamin B
(C) Vitamin C
(D) Vitamin D
Answer: (A)
The male gamete in humans is –
(A) Sperm
(B) Ovum
(C) Zygote
(D) Embryo
Answer: (A)
Which of the following diseases is hereditary?
(A) Diabetes
(B) Cancer
(C) Hemophilia
(D) Asthma
Answer: (C)
Which plant tissue is responsible for transport of water?
(A) Phloem
(B) Xylem
(C) Parenchyma
(D) Collenchyma
Answer: (B)
Which hormone lowers blood glucose levels?
(A) Glucagon
(B) Adrenaline
(C) Insulin
(D) Estrogen
Answer: (C)
Which organ regulates body temperature?
(A) Brain
(B) Skin
(C) Heart
(D) Liver
Answer: (B)
The process of cell eating solid particles is called –
(A) Pinocytosis
(B) Phagocytosis
(C) Exocytosis
(D) Endocytosis
Answer: (B)
Which part of the brain controls voluntary actions?
(A) Cerebrum
(B) Cerebellum
(C) Medulla
(D) Thalamus
Answer: (A)
Which of the following is an autotroph?
(A) Fungi
(B) Algae
(C) Human
(D) Cow
Answer: (B)
Which of these is a disease of the respiratory system?
(A) Rickets
(B) Pneumonia
(C) Jaundice
(D) Goitre
Answer: (B)
In photosynthesis, the gas released is –
(A) CO2
(B) O2
(C) H2
(D) N2
Answer: (B)
Which part of the brain controls heartbeat and breathing?
(A) Medulla
(B) Cerebellum
(C) Pons
(D) Cerebrum
Answer: (A)
Which gland secretes adrenaline?
(A) Pituitary
(B) Adrenal
(C) Thyroid
(D) Parathyroid
Answer: (B)
Which process converts glucose into energy in cells?
(A) Digestion
(B) Photosynthesis
(C) Respiration
(D) Fermentation
Answer: (C)
What is the function of hemoglobin?
(A) Fight infections
(B) Carry oxygen
(C) Clot blood
(D) Regulate hormones
Answer: (B)
Which is the main nitrogenous waste in humans?
(A) Uric acid
(B) Ammonia
(C) Urea
(D) Creatinine
Answer: (C)
Which part of the plant is responsible for sexual reproduction?
(A) Leaf
(B) Root
(C) Flower
(D) Stem
Answer: (C)
How many pairs of ribs are there in the human body?
(A) 10
(B) 11
(C) 12
(D) 13
Answer: (C)
The lens of the eye is –
(A) Concave
(B) Convex
(C) Cylindrical
(D) Plano-convex
Answer: (B)
Which mineral is essential for hemoglobin synthesis?
(A) Calcium
(B) Iron
(C) Zinc
(D) Magnesium
Answer: (B)
Which of the following causes polio?
(A) Bacteria
(B) Virus
(C) Fungus
(D) Protozoa
Answer: (B)
Which protein is found in muscles?
(A) Actin and myosin
(B) Hemoglobin
(C) Albumin
(D) Keratin
Answer: (A)
Which vitamin is water-soluble?
(A) A
(B) D
(C) C
(D) K
Answer: (C)
What type of joint is the shoulder joint?
(A) Hinge
(B) Ball and socket
(C) Pivot
(D) Saddle
Answer: (B)

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