Which organ is responsible for vision?
A) Ear
B) Nose
C) Eye ✅
D) Skin Explanation: The eye is the sensory organ for vision.
Which part of the ear helps in maintaining balance?
A) Cochlea
B) Pinna
C) Semicircular canals ✅
D) Tympanic membrane Explanation: Semicircular canals detect rotational movements of the head.
Which sensory organ detects sound?
A) Eye
B) Skin
C) Tongue
D) Ear ✅ Explanation: The ear detects sound waves and aids in hearing.
The colored part of the eye is called the:
A) Lens
B) Iris ✅
C) Cornea
D) Retina Explanation: The iris controls the size of the pupil and gives eye color.
Which organ helps in the sensation of taste?
A) Tongue ✅
B) Nose
C) Skin
D) Ear Explanation: The tongue contains taste buds for detecting flavors.
Which structure in the nose detects smell?
A) Olfactory bulb ✅
B) Nasal septum
C) Sinuses
D) Turbinates Explanation: The olfactory bulb processes smell signals.
Which layer of the eye contains photoreceptors?
A) Sclera
B) Retina ✅
C) Cornea
D) Iris Explanation: The retina contains rods and cones that detect light.
What part of the tongue is most sensitive to sweetness?
A) Tip ✅
B) Sides
C) Back
D) Middle Explanation: Sweet taste is primarily detected at the tip.
The transparent front part of the eye is the:
A) Cornea ✅
B) Iris
C) Retina
D) Lens Explanation: The cornea helps focus incoming light.
Which cells in the retina are responsible for color vision?
A) Rods
B) Cones ✅
C) Bipolar cells
D) Ganglion cells Explanation: Cones are sensitive to color and bright light.
The skin is the sensory organ for:
A) Vision
B) Hearing
C) Touch ✅
D) Smell Explanation: Skin detects touch, temperature, and pain.
The eardrum is also known as the:
A) Pinna
B) Tympanic membrane ✅
C) Cochlea
D) Oval window Explanation: It vibrates in response to sound waves.
Which taste cannot be detected by humans?
A) Bitter
B) Sweet
C) Spicy ✅
D) Umami Explanation: Spicy is sensed as pain, not taste.
Which part of the ear contains the organ of Corti?
A) Outer ear
B) Middle ear
C) Inner ear ✅
D) Eustachian tube Explanation: The organ of Corti is the hearing receptor inside the cochlea.
Which part of the eye focuses light onto the retina?
A) Iris
B) Cornea
C) Lens ✅
D) Sclera Explanation: The lens adjusts shape to focus light accurately.
The sense of smell is called:
A) Gustation
B) Olfaction ✅
C) Tactile
D) Audition Explanation: Olfaction is the detection of airborne molecules.
The pinna is a part of which organ?
A) Eye
B) Tongue
C) Ear ✅
D) Nose Explanation: The pinna collects sound waves and directs them into the ear.
Which part of the skin is rich in touch receptors?
A) Epidermis
B) Dermis ✅
C) Hypodermis
D) Subcutaneous tissue Explanation: The dermis contains touch, pressure, and pain receptors.
Which type of papillae contains most taste buds?
A) Filiform
B) Fungiform
C) Foliate
D) Vallate ✅ Explanation: Vallate papillae have the highest concentration of taste buds.
The blind spot in the eye lacks:
A) Blood vessels
B) Ganglion cells
C) Photoreceptors ✅
D) Pigment Explanation: The optic disc lacks rods and cones, forming the blind spot.
🟡 Moderate Level (21–40)
Which part of the eye changes shape to focus on near or far objects?
A) Iris
B) Retina
C) Lens ✅
D) Cornea Explanation: The lens changes shape for accommodation.
Which cranial nerve is associated with hearing and balance?
A) Trigeminal
B) Facial
C) Vestibulocochlear ✅
D) Optic Explanation: The 8th cranial nerve carries auditory and balance information.
Which structure transmits vibrations from the eardrum to the inner ear?
A) Cochlea
B) Semicircular canals
C) Auditory ossicles ✅
D) Eustachian tube Explanation: The malleus, incus, and stapes conduct sound vibrations.
Which fluid fills the anterior chamber of the eye?
A) Vitreous humor
B) Aqueous humor ✅
C) Synovial fluid
D) Perilymph Explanation: Aqueous humor nourishes the cornea and lens.
Which receptors are responsible for detecting pain?
A) Mechanoreceptors
B) Thermoreceptors
C) Nociceptors ✅
D) Photoreceptors Explanation: Nociceptors respond to harmful stimuli.
Which part of the ear is connected to the pharynx?
A) Eustachian tube ✅
B) Cochlea
C) Semicircular canals
D) Auditory canal Explanation: It equalizes pressure between the ear and throat.
Which taste receptor detects umami?
A) Glucose receptor
B) Glutamate receptor ✅
C) Salt receptor
D) Bitter receptor Explanation: Umami taste detects amino acids like glutamate.
Which cells support photoreceptors in the retina?
A) Bipolar cells
B) Muller cells ✅
C) Rods
D) Cones Explanation: Muller cells provide structural and functional support.
How many semicircular canals are present in each ear?
A) Two
B) Three ✅
C) Four
D) Five Explanation: The three canals detect head movement in all planes.
Which part of the brain interprets visual information?
A) Cerebellum
B) Parietal lobe
C) Occipital lobe ✅
D) Temporal lobe Explanation: The occipital lobe processes signals from the eyes.
What causes the eye’s pupil to constrict?
A) Dim light
B) Parasympathetic stimulation ✅
C) Sympathetic stimulation
D) Distant vision Explanation: Parasympathetic nerves narrow the pupil in bright light.
Which part of the eye contains the highest density of cones?
A) Retina
B) Blind spot
C) Fovea centralis ✅
D) Iris Explanation: The fovea provides sharp central vision.
How many primary taste sensations are recognized by the tongue?
A) 3
B) 4
C) 5 ✅
D) 6 Explanation: Sweet, sour, salty, bitter, and umami are the primary tastes.
Which eye structure helps drain excess aqueous humor?
A) Iris
B) Canal of Schlemm ✅
C) Retina
D) Cornea Explanation: The canal maintains intraocular pressure.
Where are olfactory receptors located?
A) Tongue
B) Nasal cavity roof ✅
C) Sinuses
D) Throat Explanation: The upper nasal cavity has olfactory receptor neurons.
Which part of the ear converts vibrations into nerve signals?
A) Cochlea ✅
B) Tympanic membrane
C) Malleus
D) Semicircular canal Explanation: The cochlea contains hair cells that convert vibrations into electrical impulses.
Which receptors detect changes in temperature?
A) Thermoreceptors ✅
B) Mechanoreceptors
C) Chemoreceptors
D) Nociceptors Explanation: Thermoreceptors respond to heat and cold.
Which fluid fills the posterior chamber of the eye?
A) Perilymph
B) Aqueous humor
C) Vitreous humor ✅
D) Cerebrospinal fluid Explanation: Vitreous humor maintains eye shape.
Which sensory receptor detects pressure and vibration?
A) Ruffini corpuscle
B) Pacinian corpuscle ✅
C) Meissner’s corpuscle
D) Merkel cells Explanation: Pacinian corpuscles respond to deep pressure.
Which structure maintains equilibrium during linear acceleration?
A) Cochlea
B) Semicircular canals
C) Utricle and saccule ✅
D) Oval window Explanation: These detect changes in head position relative to gravity.
🔴 Hard Level (41–50)
Which cranial nerve carries olfactory information?
A) I – Olfactory ✅
B) II – Optic
C) V – Trigeminal
D) VII – Facial Explanation: The olfactory nerve transmits smell signals.
The lens is held in place by:
A) Iris muscles
B) Suspensory ligaments ✅
C) Ciliary body
D) Retina Explanation: Zonules or suspensory ligaments connect the lens to the ciliary body.
Which part of the skin senses deep touch?
A) Free nerve endings
B) Meissner’s corpuscles
C) Pacinian corpuscles ✅
D) Thermoreceptors Explanation: Pacinian corpuscles detect deep pressure and vibration.
Which part of the eye is avascular?
A) Retina
B) Cornea ✅
C) Choroid
D) Iris Explanation: The cornea lacks blood vessels for transparency.
Which molecule binds odorants in the nasal cavity?
A) Mucin
B) Odorant-binding proteins ✅
C) Albumin
D) Enzymes Explanation: OBPs help transport odorants to receptors.
The ciliary body controls lens shape by:
A) Pupil dilation
B) Aqueous humor secretion
C) Contracting and relaxing ✅
D) Focusing light Explanation: It alters lens curvature for focusing.
Which part of the ear converts sound waves into electrical signals?
A) Stapes
B) Organ of Corti ✅
C) Tympanic membrane
D) Semicircular canal Explanation: The organ of Corti contains sensory hair cells.
Which papillae are most numerous but lack taste buds?
A) Fungiform
B) Foliate
C) Filiform ✅
D) Circumvallate Explanation: Filiform papillae are for texture, not taste.
The fovea centralis is located within the:
A) Retina ✅
B) Lens
C) Cornea
D) Choroid Explanation: It’s the area of sharpest vision.
Which nerve carries taste from the anterior 2/3 of the tongue?
A) Glossopharyngeal
B) Vagus
C) Trigeminal
D) Facial nerve ✅ Explanation: The facial nerve (VII) transmits taste from the anterior tongue.