NEET Biology Sensory Organs MCQs Set 03

Multiple Choice Questions (MCQs) for NEET Biology: Sensory Organs

Access targeted multiple-choice questions for Sensory Organs designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Practice Sensory Organs MCQs for NEET Biology

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Multiple Choice Questions

Question 1: Which structure of the eye is related to focussing of the eye?
(a) Lens
(b) Cornea
(c) Retina
(d) Aqueous and vitreous humor
Show Answer & Explanation

Answer: (a) Lens

Explanation:
1. The lens changes its curvature to focus on near or far objects.

Teacher's Note:
1. The cornea does the major refraction.

Question 2: Which statement is wrong about the conjunctiva?
(a) Ectodermal origin
(b) Present on the central part of cornea
(c) Vascular
(d) Covers the anterior part of sclera
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Answer: (b) Present on the central part of cornea

Explanation:
1. The conjunctiva covers the sclera and inner eyelids but is absent over the central cornea, which has to remain transparent.

Teacher's Note:
1. It is vascular and ectodermal.

Question 3: When the canal of Schlemm is blocked, what condition is developed?
(a) Intraocular pressure is increased
(b) Retina starts damage
(c) Person may become blind
(d) All of the above
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Answer: (d) All of the above

Explanation:
1. Blockage causes a rise in intraocular pressure, retinal and optic nerve damage and possible blindness, as in glaucoma.

Teacher's Note:
1. The canal drains aqueous humor.

Question 4: Corneal transplant in humans is almost never rejected. This is because:
(a) It is composed of enucleated cells
(b) It is a non-living layer
(c) Its cells are least penetrable by bacteria
(d) It has no blood supply
Show Answer & Explanation

Answer: (d) It has no blood supply

Explanation:
1. The cornea has no blood vessels, so immune cells and antibodies rarely reach it, and rejection is rare.

Teacher's Note:
1. It is nourished by aqueous humor.

Question 5: Maximum refraction of light takes place at the:
(a) Cornea
(b) Lens
(c) Iris
(d) Aqueous humor
Show Answer & Explanation

Answer: (a) Cornea

Explanation:
1. The curved cornea, with a large difference in refractive index between air and the eye, bends light the most.

Teacher's Note:
1. The lens does the fine focusing.

Question 6: The vitreous humor contains:
(a) Mucoprotein
(b) Water
(c) Mucoid connective tissue
(d) All of the above
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Answer: (d) All of the above

Explanation:
1. The vitreous humor is a transparent jelly of water, mucoprotein (vitrin) and a mucoid network.

Teacher's Note:
1. It maintains the shape of the eyeball.

Question 7: Only rods are present in the eyes of:
(a) Pigeon
(b) Squirrel
(c) Fowl
(d) Owl
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Answer: (d) Owl

Explanation:
1. Owls are nocturnal and have only rods in the retina.

Teacher's Note:
1. Pigeons, squirrels and fowl have mostly cones.

Question 8: The organ of Corti is found in the:
(a) Kidneys
(b) Heart
(c) Nasal chamber
(d) Internal ear
Show Answer & Explanation

Answer: (d) Internal ear

Explanation:
1. The organ of Corti, the receptor of hearing, is in the cochlea of the internal ear.

Teacher's Note:
1. It lies on the basilar membrane.

Question 9: The fluid found in the semicircular canals of the internal ear is:
(a) Perilymph
(b) Endolymph
(c) Haemolymph
(d) Lymph
Show Answer & Explanation

Answer: (b) Endolymph

Explanation:
1. The membranous semicircular canals contain endolymph, and perilymph surrounds them.

Teacher's Note:
1. Endolymph is also in the cochlear duct.

Question 10: The chief function of the semicircular canals of the internal ear is:
(a) Balancing and hearing
(b) To perceive sound vibrations of high frequency
(c) To maintain dynamic equilibrium of the body while the body is in balance
(d) To transmit sound vibration to the auditory nerve
Show Answer & Explanation

Answer: (c) To maintain dynamic equilibrium of the body while the body is in balance

Explanation:
1. The semicircular canals detect rotational movements and help dynamic equilibrium.

Teacher's Note:
1. The utricle and saccule detect static position.

Question 11: In mammals, the organ of Corti occurs in the:
(a) Main canal
(b) Cochlear canal
(c) Tympanum
(d) Eustachian tube
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Answer: (b) Cochlear canal

Explanation:
1. The organ of Corti is located on the basilar membrane inside the cochlear canal (scala media).

Teacher's Note:
1. It has hair cells that detect sound.

Question 12: The organ of Corti is concerned with the sense of:
(a) Smell
(b) Hearing
(c) Taste
(d) Equilibrium
Show Answer & Explanation

Answer: (b) Hearing

Explanation:
1. It converts sound vibrations to nerve impulses.

Teacher's Note:
1. The vestibular apparatus is for balance.

Question 13: Which structure helps a person to maintain equilibrium?
(a) Cochlea
(b) Eustachian tube
(c) Semicircular canals
(d) Hammer like bone
Show Answer & Explanation

Answer: (c) Semicircular canals

Explanation:
1. The semicircular canals and the otolith organs maintain balance.

Teacher's Note:
1. The cochlea is for hearing.

Question 14: The cochlea of the mammalian ear is concerned with:
(a) Balancing of the body
(b) Hearing
(c) Perception of atmospheric pressure
(d) Both balancing and hearing
Show Answer & Explanation

Answer: (b) Hearing

Explanation:
1. The cochlea is the hearing organ.

Teacher's Note:
1. The vestibule is for balance.

Question 15: The external ear (pinna) is characteristic of:
(a) Mammals
(b) Reptiles
(c) Amphibians
(d) Fishes
Show Answer & Explanation

Answer: (a) Mammals

Explanation:
1. The external ear or pinna is a feature of mammals.

Teacher's Note:
1. Birds and reptiles have no pinna.

Question 16: Our ear can hear sound waves of the frequency:
(a) Above 20,000 cycles per sec
(b) 5 to 100 cycles per sec
(c) 50 to 20,000 cycles per sec
(d) 20 to 20,000 cycles per sec
Show Answer & Explanation

Answer: (d) 20 to 20,000 cycles per sec

Explanation:
1. The human audible range is about 20 to 20,000 Hz.

Teacher's Note:
1. Above this range is ultrasound.

Question 17: The fluid surrounding the membranous labyrinth of humans is called:
(a) Perilymph
(b) Endolymph
(c) Haemolymph
(d) Cerebrospinal fluid
Show Answer & Explanation

Answer: (a) Perilymph

Explanation:
1. The bony labyrinth is filled with perilymph, which surrounds the endolymph-filled membranous labyrinth.

Teacher's Note:
1. The two fluids are separated.

Question 18: The cochlea contains:
(a) Scala vestibuli
(b) Scala tympani
(c) Scala media
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. The cochlea has three canals: scala vestibuli, scala media and scala tympani.

Teacher's Note:
1. The scala media holds the organ of Corti.

Question 19: By the stimulation of which structure of the human ear are sound waves perceived by the brain?
(a) Basilar membrane
(b) Tectorial membrane
(c) Meissner's membrane
(d) Sensory hair cells of the organ of Corti
Show Answer & Explanation

Answer: (d) Sensory hair cells of the organ of Corti

Explanation:
1. Sound waves cause the basilar membrane to vibrate, which bends the hair cells that generate impulses.

Teacher's Note:
1. The impulses go through the auditory nerve.

Question 20: Which of the following is NOT an ear ossicle?
(a) Incus
(b) Malleus
(c) Humerus
(d) Stapes
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Answer: (c) Humerus

Explanation:
1. The ear ossicles are the malleus, incus and stapes. The humerus is a bone of the arm.

Teacher's Note:
1. The three ossicles are the smallest bones of the body.

Question 21: The cochlea arises from the:
(a) Utriculus
(b) Sacculus
(c) Middle ear
(d) Semicircular canals
Show Answer & Explanation

Answer: (b) Sacculus

Explanation:
1. The cochlea is an outgrowth of the sacculus in development.

Teacher's Note:
1. Its upper part forms the vestibular system.

Question 22: Another name for the internal ear is:
(a) Utriculus
(b) Membranous labyrinth
(c) Sacculus
(d) Ductus endolymphaticus
Show Answer & Explanation

Answer: (b) Membranous labyrinth

Explanation:
1. The inner ear consists of the membranous labyrinth within the bony labyrinth.

Teacher's Note:
1. It includes the cochlea and the vestibular apparatus.

Question 23: The external auditory meatus contains the following gland:
(a) Ceruminous gland
(b) Lachrymal gland
(c) Harderian gland
(d) Meibomian gland
Show Answer & Explanation

Answer: (a) Ceruminous gland

Explanation:
1. Ceruminous glands produce earwax, which traps dust and insects.

Teacher's Note:
1. Meibomian glands are on the eyelid.

Question 24: Which of the following statements is correct regarding the structure of the ear?
(a) The ear ossicles increase the efficiency of transmission of sound waves
(b) The malleus is attached to the oval window
(c) The Eustachian tube connects the middle ear cavity with the larynx
(d) The middle ear contains three ear ossicles called malleus, incus and sphenoid
Show Answer & Explanation

Answer: (a) The ear ossicles increase the efficiency of transmission of sound waves

Explanation:
1. The ossicles amplify and transmit sound. The malleus is attached to the tympanic membrane and the stapes to the oval window. The Eustachian tube connects to the pharynx, and the third ossicle is stapes.

Teacher's Note:
1. Check each detail separately.

Question 25: Otoliths (otoconia) are CaCO3 particles found in:
(a) Perilymph
(b) Endolymph
(c) Bones
(d) Vitreous humor
Show Answer & Explanation

Answer: (b) Endolymph

Explanation:
1. Otoliths are calcium carbonate crystals in the endolymph of the utricle and saccule.

Teacher's Note:
1. They help to sense gravity and linear motion.

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