Sense Organs Practice Questions
19 free Sense Organs practice questions for the General Science. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
The receptors for hearing, known as hair cells, are located within which structure of the ear?
- A Semicircular canals
- B Oval window
- C Organ of Corti
- D Eustachian tube
Correct answer: Organ of Corti
The Organ of Corti sits inside the cochlea of the inner ear. It contains hair cells that convert mechanical sound vibrations into electrical nerve impulses sent to the brain.
Which type of photoreceptor cell in the retina is responsible for color vision and visual acuity in bright light?
- A Rods
- B Cones
- C Bipolar cells
- D Ganglion cells
Correct answer: Cones
Cones are concentrated in the fovea centralis and are sensitive to different wavelengths of light, allowing us to see color. Rods, by contrast, are more sensitive to low light but do not perceive color.
What is the function of the Eustachian tube in the human ear?
- A To amplify sound vibrations passing to the inner ear
- B To maintain balance during head movement
- C To equalize air pressure across the eardrum
- D To produce earwax that protects the ear canal
Correct answer: To equalize air pressure across the eardrum
The Eustachian tube connects the middle ear to the nasopharynx. By opening during swallowing or yawning it keeps the pressure on both sides of the eardrum equal, preventing pain, damage and muffled hearing.
The olfactory receptors responsible for the sense of smell are located in the upper part of which cavity?
- A Oral cavity
- B Nasal cavity
- C Thoracic cavity
- D Cranial cavity
Correct answer: Nasal cavity
Olfactory sensory neurons are located in the olfactory epithelium at the roof of the nasal cavity. These neurons detect volatile chemical molecules and send signals directly to the olfactory bulb in the brain.
Which of the following are the tiny bumps on the surface of the tongue that contain taste buds?
- A Alveoli
- B Villi
- C Papillae
- D Microvilli
Correct answer: Papillae
Papillae provide the tongue with its rough texture and house the gustatory receptors (taste buds). There are different types, including fungiform, circumvallate, and foliate papillae.
Which part of the ear is responsible for maintaining dynamic equilibrium and sensing rotational movement of the head?
- A Cochlea
- B Semicircular canals
- C Auditory ossicles
- D External auditory canal
Correct answer: Semicircular canals
The three semicircular canals lie in different planes and contain a fluid called endolymph. When the head rotates, the fluid lags behind and bends hair cells in the ampullae, informing the brain about changes in orientation.
What is the medical term for the 'blind spot' in the human eye where the optic nerve exits the retina?
- A Fovea centralis
- B Optic disc
- C Macula
- D Cornea
Correct answer: Optic disc
The optic disc lacks photoreceptor cells (rods and cones) because it is the point where nerve fibers and blood vessels pass through the back of the eye. Consequently, light falling on this specific area cannot be detected.
Which of the following is the correct order of the three small bones (ossicles) in the middle ear, starting from the eardrum?
- A Stapes, Incus, Malleus
- B Incus, Malleus, Stapes
- C Malleus, Incus, Stapes
- D Malleus, Stapes, Incus
Correct answer: Malleus, Incus, Stapes
The Malleus (hammer) is attached to the eardrum, the Incus (anvil) is in the middle, and the Stapes (stirrup) connects to the oval window of the inner ear. They work together to amplify sound vibrations.
Which vitamin is essential for the synthesis of rhodopsin, the pigment found in rod cells required for night vision?
- A Vitamin C
- B Vitamin D
- C Vitamin A
- D Vitamin K
Correct answer: Vitamin A
Vitamin A is a precursor to retinal, which combines with opsin to form rhodopsin. A deficiency in Vitamin A can lead to nyctalopia, commonly known as night blindness.
Which layer of the skin contains the majority of sensory receptors for touch, pressure, and temperature?
- A Epidermis
- B Dermis
- C Hypodermis
- D Fascia
Correct answer: Dermis
The dermis houses specialized receptors such as Meissner's corpuscles for light touch and Pacinian corpuscles for deep pressure. The epidermis carries only free nerve endings, so the dermis is the main sensory layer.
The transparent, protective outer layer of the eye that also helps to refract (bend) light is called the:
- A Lens
- B Choroid
- C Cornea
- D Vitreous humor
Correct answer: Cornea
The cornea is the eye's outermost lens. It functions like a window that controls and focuses the entry of light into the eye, providing about two-thirds of the eye's total optical power.
Which taste sensation is triggered by the detection of amino acids like glutamate, often described as 'savory'?
- A Sour
- B Bitter
- C Salty
- D Umami
Correct answer: Umami
Umami is one of the five basic tastes. It is sensed by specific receptors that respond to glutamate, a common amino acid in protein-rich foods like meat, cheese, and mushrooms.
What is the primary function of the lacrimal glands?
- A To produce earwax
- B To produce tears
- C To secrete oil
- D To produce saliva
Correct answer: To produce tears
The lacrimal glands lie above the outer corner of each eye and continually release tears that moisten, nourish and protect the surface of the eye from infection and debris.
The ability of the eye lens to change its shape to focus on objects at varying distances is called:
- A Accommodation
- B Reflection
- C Presbyopia
- D Dark adaptation
Correct answer: Accommodation
Accommodation is achieved by the ciliary muscles, which alter the curvature of the flexible lens. This keeps the image of an object sharp on the retina as its distance from the eye changes.
Which cranial nerve carries visual information from the retina to the brain?
- A Optic nerve (II)
- B Olfactory nerve (I)
- C Vagus nerve (X)
- D Trigeminal nerve (V)
Correct answer: Optic nerve (II)
The optic nerve is the second cranial nerve. It transmits electrical impulses from the photoreceptors in the retina to the visual cortex in the occipital lobe of the brain.
What is the primary function of the Pinna (Auricle)?
- A To collect sound waves and direct them inward
- B To amplify vibrations within the middle ear
- C To protect the inner ear from infection
- D To convert sound vibrations into nerve impulses
Correct answer: To collect sound waves and direct them inward
The pinna is the visible, cartilaginous part of the outer ear. Its funnel shape gathers sound waves from the environment and channels them into the external auditory canal towards the eardrum.
Which condition is characterized by increased intraocular pressure that can damage the optic nerve and lead to vision loss?
- A Glaucoma
- B Cataracts
- C Astigmatism
- D Myopia
Correct answer: Glaucoma
Glaucoma occurs when the drainage of aqueous humor is obstructed, leading to a buildup of pressure. If left untreated, the high pressure can permanently damage the nerve fibers of the optic nerve.
The 'Gustatory' sense refers to which of the following?
- A Sense of Sight
- B Sense of Touch
- C Sense of Hearing
- D Sense of Taste
Correct answer: Sense of Taste
Gustation is the chemical sense that allows us to perceive different flavors. It works closely with the olfactory sense to create the complex perception of food flavor.
Which structure in the eye contains the highest concentration of cone cells and provides the sharpest vision?
- A Optic disc
- B Suspensory ligament
- C Ciliary body
- D Fovea centralis
Correct answer: Fovea centralis
The fovea centralis is a small pit at the centre of the macula lutea of the retina, packed almost entirely with cones. It gives the high-acuity central vision needed for reading and driving.