NEET Biology Sensory Organs MCQs Set 05

Download NEET MCQs for NEET Biology: Sensory Organs

Review structured MCQ sets for NEET Biology Sensory Organs. Built according to official NEET guidelines, these downloadable questions support daily revision and core concept reinforcement.

Chapter-wise Objective Questions: Sensory Organs

Access the complete set of multiple-choice questions for Sensory Organs below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official NEET textbooks.

Multiple Choice Questions

Question 1: Choose the correct option regarding changes in the iris: contraction of radial dilator muscle (RDM) or relaxation of circular sphincter muscle (CSM) under the control of a nervous system (A) changes the pupil diameter (D) and gives (E).
(a) Parasympathetic NS: RDM contracts, CSM relaxes, pupil diameter increases, mydriasis
(b) Sympathetic NS: CSM contracts, RDM relaxes, pupil diameter decreases, miosis
(c) Parasympathetic NS: CSM contracts, RDM relaxes, pupil diameter increases, miosis
(d) Sympathetic NS: RDM contracts, CSM relaxes, pupil diameter increases, mydriasis
Show Answer & Explanation

Answer: (d) Sympathetic NS: RDM contracts, CSM relaxes, pupil diameter increases, mydriasis

Explanation:
1. Sympathetic stimulation contracts the radial dilator muscles and relaxes the circular sphincter muscles, so the pupil widens (mydriasis).

Teacher's Note:
1. Parasympathetic stimulation does the reverse and causes miosis.

Question 2: In our eyes, the optic nerve leaves and retinal blood vessels enter at a point called the optic disc. Which is characteristic of this point for all except one?
(a) Located medial to and slightly above the posterior pole
(b) Photoreceptor cells are absent
(c) Thinned out portion of retina where visual acuity is greatest
(d) Located on the lateral side of the macula lutea
Show Answer & Explanation

Answer: (c) Thinned out portion of retina where visual acuity is greatest

Explanation:
1. The optic disc is the blind spot, which has no photoreceptors.

Teacher's Note:
1. The thinned out region of greatest visual acuity is the fovea.

Question 3: The direction of light striking the retina will be:
(a) Photosensory cells, bipolar neuron layer, ganglionic cells, sensory nerve
(b) Sensory nerve, bipolar neurons, ganglionic cells, photosensory cells
(c) Sensory nerve fibre, ganglionic cells, bipolar cells, photosensory cells
(d) Photoreceptor cells, ganglionic cells, bipolar cells, optic nerve
Show Answer & Explanation

Answer: (c) Sensory nerve fibre, ganglionic cells, bipolar cells, photosensory cells

Explanation:
1. The retinal layers from inside to outside are ganglion cells, bipolar cells and photoreceptors, so light passes through the ganglion and bipolar layers before reaching the photoreceptors.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 4: Visual acuity is greatest in the retinal fovea because of all except:
(a) Only cones are present in the fovea
(b) Each foveal cone has its own optic nerve fibre
(c) Cones of the fovea are slightly above the posterior pole and few rods are also found
(d) Blood vessels and ganglionic cells do not cover the foveal cones
Show Answer & Explanation

Answer: (c) Cones of the fovea are slightly above the posterior pole and few rods are also found

Explanation:
1. The fovea has only cones, each connected to its own nerve fibre, and the layers above are thinned out.

Teacher's Note:
1. No rods are found in the fovea, and it lies at the posterior pole of the eye.

Question 5: Which of the following are not functions of rods? (A) day light vision (B) twilight vision (C) scotopic vision (D) colour vision (E) photopic vision (F) dim light vision
(a) A, D, F
(b) B, C, D
(c) A, D, E
(d) All except B, D, F
Show Answer & Explanation

Answer: (c) A, D, E

Explanation:
1. Rods work in dim light and give twilight (scotopic) vision.

Teacher's Note:
1. Day light (photopic) vision and colour vision are functions of the cones.

Question 6: Which of the following statements is false?
(a) Light induces dissociation of the retinal from opsin
(b) Action potential is generated in photoreceptor cells
(c) When red, green and blue cones are stimulated equally, the sensation of white light is produced
(d) Action potential is transmitted by the optic nerve to the visual cortex area of the brain
Show Answer & Explanation

Answer: (b) Action potential is generated in photoreceptor cells

Explanation:
1. Photoreceptors produce graded (receptor) potentials, and action potentials are generated in the ganglion cells and carried by the optic nerve.

Teacher's Note:
1. The other statements are correct.

Question 7: Which of the following pairs is not matched correctly?
(a) Photopic vision - cones
(b) Scotopic vision - rods
(c) Retinal - ketone of vitamin A
(d) Opsin - protein
Show Answer & Explanation

Answer: (c) Retinal - ketone of vitamin A

Explanation:
1. Retinal is the aldehyde of vitamin A, and not a ketone.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 8: Which of the following pairs is not matched correctly?
(a) Cataract - lens becomes opaque
(b) Night blindness - deficiency of vitamin A
(c) Myopia - image formed behind the retina
(d) Xerophthalmia - keratinisation of conjunctiva
Show Answer & Explanation

Answer: (c) Myopia - image formed behind the retina

Explanation:
1. In myopia the image is formed in front of the retina, and the eyeball is too long.

Teacher's Note:
1. In hypermetropia the image forms behind the retina.

Question 9: Which of the following statements is false?
(a) The layers of cells in the retina from inside to outside are ganglion cells, bipolar cells and photoreceptor cells
(b) The eyeball contains a transparent crystalline lens held in place by ligaments attached to the iris only
(c) The anterior portion of the fibrous layer is termed the cornea
(d) The choroid layer helps in the prevention of internal reflection
Show Answer & Explanation

Answer: (b) The eyeball contains a transparent crystalline lens held in place by ligaments attached to the iris only

Explanation:
1. The lens is held in position by the suspensory ligaments attached to the ciliary body, and not to the iris.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 10: Colour vision, scotopic vision, photopic vision, white and black vision, iodopsin, dim light, rhodopsin, bright light, photoreceptor. How many of these are related to rods?
(a) Five
(b) Six
(c) Seven
(d) Eight
Show Answer & Explanation

Answer: (a) Five

Explanation:
1. Rods are related to scotopic vision, white and black vision, dim light, rhodopsin and being photoreceptors, which makes five.

Teacher's Note:
1. Colour vision, photopic vision, iodopsin and bright light are related to cones.

Question 11: Which part of the ear is influenced by gravity and movement?
(a) Vestibular apparatus
(b) Cochlea
(c) Organ of Corti
(d) Ear ossicle
Show Answer & Explanation

Answer: (a) Vestibular apparatus

Explanation:
1. The vestibular apparatus (semicircular canals, saccule and utricle) senses the position of the head and movement.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 12: The Eustachian tube connects:
(a) External ear with middle ear
(b) External ear with internal ear
(c) Middle ear with internal ear
(d) Middle ear with pharynx
Show Answer & Explanation

Answer: (d) Middle ear with pharynx

Explanation:
1. The Eustachian tube links the middle ear cavity with the pharynx.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 13: Air pressure in the middle ear is maintained by:
(a) Tympanic membrane
(b) Ear ossicles
(c) Eustachian tube
(d) Round window
Show Answer & Explanation

Answer: (c) Eustachian tube

Explanation:
1. The Eustachian tube opens into the pharynx and equalises the air pressure on the two sides of the tympanic membrane.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 14: In the organ of Corti, above the rows of hair cells a thin elastic membrane is present, called:
(a) Reissner's membrane
(b) Basilar membrane
(c) Tectorial membrane
(d) Tympanic membrane
Show Answer & Explanation

Answer: (c) Tectorial membrane

Explanation:
1. The tectorial membrane lies over the hair cells of the organ of Corti, and the hair cells bend against it when sound waves pass.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 15: At the base of the cochlea, the scala vestibuli ends at the __(a)__ window, while the scala tympani terminates at the __(b)__ window, which opens to the middle ear.
(a) a round, b oval
(b) a oval, b round
(c) a spherical, b fenestra rotundus
(d) a circular, b spherical
Show Answer & Explanation

Answer: (b) a oval, b round

Explanation:
1. The scala vestibuli ends at the oval window, and the scala tympani ends at the round window.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 16: Static equilibrium is the function of which of the following?
(a) Cochlea
(b) Crista
(c) Cupula
(d) Macula
Show Answer & Explanation

Answer: (d) Macula

Explanation:
1. The macula of the utricle and saccule senses static (position) balance, and the cristae sense dynamic balance.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 17: Which of the following pairs is not matched correctly?
(a) Stapes - smallest bone of the body
(b) Incus - anvil shaped
(c) Malleus - stirrup shaped
(d) Incus - formed by modification of the quadrate bone
Show Answer & Explanation

Answer: (c) Malleus - stirrup shaped

Explanation:
1. The malleus is hammer shaped, and the stapes is stirrup shaped.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 18: Match: I Malleus, II Incus, III Stapes, IV Pinna with (a) yellow elastic cartilage (b) articular bone (c) quadrate bone (d) hyomandibular bone and (i) hammer shape (ii) muscles vestigeal (iii) anvil shape (iv) stirrup shape.
(a) I-c-i, II-b-ii, III-d-iv, IV-a-ii
(b) I-b-i, II-d-iii, III-c-iv, IV-a-ii
(c) I-b-i, II-c-iv, III-d-iii, IV-a-ii
(d) I-b-i, II-c-iii, III-d-iv, IV-a-ii
Show Answer & Explanation

Answer: (d) I-b-i, II-c-iii, III-d-iv, IV-a-ii

Explanation:
1. The malleus comes from the articular bone and is hammer shaped, the incus comes from the quadrate and is anvil shaped, the stapes comes from the hyomandibular and is stirrup shaped, and the pinna has yellow elastic cartilage with vestigial muscles.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

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NEET Biology Sensory Organs Objective Test Questions

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