NEET Biology Sensory Organs MCQs Set 02

Practice 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.

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Multiple Choice Questions

Question 1: Colour blindness in human beings is due to:
(a) Vitamin A deficiency
(b) Sex linked inheritance
(c) Over activity of the adrenal gland
(d) Excessive drinking of alcohol
Show Answer & Explanation

Answer: (b) Sex linked inheritance

Explanation:
1. Red-green colour blindness is an X-linked recessive trait.

Teacher's Note:
1. It is more common in males.

Question 2: How many oblique and rectus muscles are found to move the eye ball in the orbit?
(a) Two
(b) Four
(c) Six
(d) Eight
Show Answer & Explanation

Answer: (c) Six

Explanation:
1. Six extrinsic muscles, four rectus and two oblique, move each eye.

Teacher's Note:
1. Two oblique plus four rectus equals six.

Question 3: A small region on the retina of the eye which contains only cones is called:
(a) Area centralis
(b) Fovea centralis
(c) Blind spot
(d) Ora serrata
Show Answer & Explanation

Answer: (b) Fovea centralis

Explanation:
1. The fovea centralis in the yellow spot contains only cones.

Teacher's Note:
1. It gives the sharpest vision.

Question 4: In man, the nictitating membrane is:
(a) Absent
(b) Vestigial
(c) Non-functional
(d) Functional
Show Answer & Explanation

Answer: (b) Vestigial

Explanation:
1. The nictitating membrane is reduced to a small fold, the plica semilunaris, which is vestigial.

Teacher's Note:
1. It is functional in birds and frogs.

Question 5: For the synthesis of rhodopsin, which of the following foods is needed?
(a) Mango
(b) Rice
(c) Carrot
(d) Tomatoes
Show Answer & Explanation

Answer: (c) Carrot

Explanation:
1. Carrot is rich in carotene, a precursor of vitamin A, which is needed for retinal.

Teacher's Note:
1. Mango is also rich, but the standard answer is carrot.

Question 6: No image formation occurs on the blind spot of the retina because:
(a) It is not present on the optical axis of the eye
(b) Here cones and rods are absent
(c) On this part only cones are present
(d) The nerve fibres of this region do not contribute to the formation of the optic chiasma
Show Answer & Explanation

Answer: (b) Here cones and rods are absent

Explanation:
1. Photoreceptors are absent where the optic nerve leaves the retina.

Teacher's Note:
1. So the region is insensitive to light.

Question 7: 'Telescopic vision' is found in:
(a) Amphibians
(b) Mammals
(c) Birds
(d) None of these
Show Answer & Explanation

Answer: (c) Birds

Explanation:
1. Birds like eagles have deep foveae that give a magnified, telescopic view.

Teacher's Note:
1. Many birds have two foveae.

Question 8: Binocular vision is found in:
(a) Man
(b) Monkey
(c) Apes
(d) All the above
Show Answer & Explanation

Answer: (d) All the above

Explanation:
1. Animals with forward-facing eyes, including man, monkeys and apes, have binocular vision.

Teacher's Note:
1. This gives depth perception.

Question 9: The highly vascular and pigmented layer of the human eye is:
(a) Retina
(b) Sclerotic
(c) Choroid
(d) None of these
Show Answer & Explanation

Answer: (c) Choroid

Explanation:
1. The choroid is a thin, vascular, pigmented layer between the sclera and the retina.

Teacher's Note:
1. It supplies nutrients and absorbs stray light.

Question 10: The part of the human eye which acts like the diaphragm of a camera is:
(a) Pupil
(b) Iris
(c) Lens
(d) Cornea
Show Answer & Explanation

Answer: (b) Iris

Explanation:
1. The iris adjusts the pupil size just like a camera diaphragm.

Teacher's Note:
1. The pupil is just the opening.

Question 11: Which of the following medicines is used to dilate the pupil?
(a) Atropine
(b) Cocaine
(c) Belladonna
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Atropine, belladonna and cocaine all dilate the pupil.

Teacher's Note:
1. Atropine is the commonly used mydriatic.

Question 12: A circular canal found in the limbus part of the eye is called:
(a) Hyaloid canal
(b) Canal of Schlemm
(c) Canal of Cloquet
(d) Eustachian tube
Show Answer & Explanation

Answer: (b) Canal of Schlemm

Explanation:
1. The canal of Schlemm drains aqueous humor into the veins.

Teacher's Note:
1. Blockage raises intraocular pressure (glaucoma).

Question 13: Three layers of the eye ball from inside to outside are:
(a) Retina, choroid, sclerotic
(b) Choroid, retina, sclerotic
(c) Sclerotic, choroid, retina
(d) Sclerotic, retina, choroid
Show Answer & Explanation

Answer: (a) Retina, choroid, sclerotic

Explanation:
1. The retina is the innermost layer, followed by the vascular choroid and then the outer tough sclera.

Teacher's Note:
1. The tunics are neural, vascular and fibrous.

Question 14: The image formed on the retina in the eye is:
(a) Erect and real
(b) Erect and virtual
(c) Inverted and real
(d) Inverted and virtual
Show Answer & Explanation

Answer: (c) Inverted and real

Explanation:
1. The lens forms a real, inverted image on the retina, which the brain interprets as upright.

Teacher's Note:
1. The brain corrects the orientation.

Question 15: Aqueous humor and vitreous humor are separated by:
(a) Cornea
(b) Conjunctiva
(c) Lens
(d) All
Show Answer & Explanation

Answer: (c) Lens

Explanation:
1. The lens lies between the aqueous chamber in front and the vitreous chamber behind.

Teacher's Note:
1. The lens is held by suspensory ligaments.

Question 16: In glaucoma:
(a) The eye ball elongates
(b) The eye ball is shortened
(c) Fluid pressure increases in the eye
(d) The cornea becomes opaque
Show Answer & Explanation

Answer: (c) Fluid pressure increases in the eye

Explanation:
1. In glaucoma the intraocular pressure increases because aqueous humor does not drain properly, damaging the optic nerve.

Teacher's Note:
1. It can lead to blindness.

Question 17: The space between the cornea and lens is the:
(a) Aqueous chamber
(b) Vitreous chamber
(c) Fovea centralis
(d) Canal of Schlemm
Show Answer & Explanation

Answer: (a) Aqueous chamber

Explanation:
1. The aqueous chamber lies between the cornea and the lens and is filled with aqueous humor.

Teacher's Note:
1. The vitreous chamber lies behind the lens.

Question 18: The cavity of the aqueous humor lies:
(a) Behind the lens
(b) In front of the lens
(c) Between choroid and sclerotic
(d) None of these
Show Answer & Explanation

Answer: (b) In front of the lens

Explanation:
1. The aqueous chamber lies in front of the lens.

Teacher's Note:
1. It is filled with a watery fluid.

Question 19: Trachoma disease is due to infection by:
(a) Chlamydia trachomatis
(b) Bacillus
(c) E. coli
(d) Salmonella
Show Answer & Explanation

Answer: (a) Chlamydia trachomatis

Explanation:
1. Trachoma is caused by Chlamydia trachomatis infecting the conjunctiva and cornea.

Teacher's Note:
1. It may lead to blindness.

Question 20: The eye defect astigmatism can be corrected using:
(a) Convex lens
(b) Concave lens
(c) Cylindrical lens
(d) Surgery
Show Answer & Explanation

Answer: (c) Cylindrical lens

Explanation:
1. Cylindrical lenses compensate for the irregular curvature of the cornea.

Teacher's Note:
1. Astigmatism blurs vision in one axis.

Question 21: The mucoprotein found in the vitreous humor is:
(a) Albumin
(b) Vitrin
(c) Globulin
(d) Lysozyme
Show Answer & Explanation

Answer: (b) Vitrin

Explanation:
1. Vitrin is the mucoprotein of the vitreous humor, which is a transparent jelly.

Teacher's Note:
1. It keeps the eyeball shape.

Question 22: 'Miosis' in the eye refers to:
(a) Reduction in diameter of pupil
(b) Increased diameter of pupil
(c) Reduction division in retina
(d) Shrinkage of eye ball
Show Answer & Explanation

Answer: (a) Reduction in diameter of pupil

Explanation:
1. Miosis is the constriction of the pupil. Mydriasis is its dilation.

Teacher's Note:
1. Bright light causes miosis.

Question 23: Astigmatism develops when:
(a) The lens becomes opaque
(b) The curvature of the conjunctiva is changed
(c) The lens becomes nonflexible
(d) The curvature of the cornea is changed
Show Answer & Explanation

Answer: (d) The curvature of the cornea is changed

Explanation:
1. An irregular curvature of the cornea (or lens) causes light to focus at different points.

Teacher's Note:
1. It is corrected with cylindrical lenses.

Question 24: What conditions are developed after deficiency of vitamin A?
(a) Night blindness
(b) Keratinisation of cornea
(c) Keratinisation of conjunctiva
(d) All the above
Show Answer & Explanation

Answer: (d) All the above

Explanation:
1. Vitamin A deficiency causes night blindness, xerophthalmia and keratinisation of the cornea and conjunctiva.

Teacher's Note:
1. Retinol is needed for epithelial health and vision.

Question 25: When a person comes into bright light, what will happen?
(a) Synthesis of rhodopsin
(b) Mydriasis
(c) Miosis
(d) None of the above
Show Answer & Explanation

Answer: (c) Miosis

Explanation:
1. Bright light constricts the pupil (miosis) by contraction of circular iris muscles.

Teacher's Note:
1. Dim light causes mydriasis.

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