NEET Biology Sensory Organs MCQs Set 01

Biology Objective Questions and Answers: Sensory Organs

Explore reliable objective questions for Sensory Organs tailored for NEET learners. Utilizing these Biology multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

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Multiple Choice Questions

Question 1: The aperture of the eye can be changed by:
(a) Aqueous humor
(b) Vitreous humor
(c) Ciliary muscles
(d) Iris
Show Answer & Explanation

Answer: (d) Iris

Explanation:
1. The muscles of the iris change the diameter of the pupil, which is the aperture of the eye.

Teacher's Note:
1. The iris works like the diaphragm of a camera.

Question 2: Which is responsible for colour detection?
(a) Cones
(b) Rods
(c) Rods and cones
(d) Choroid
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Answer: (a) Cones

Explanation:
1. Cones, containing photopigments sensitive to red, green and blue light, give colour vision.

Teacher's Note:
1. Rods work in dim light.

Question 3: The pigmented layer in the eye is called:
(a) Cornea
(b) Sclerotic
(c) Retina
(d) All
Show Answer & Explanation

Answer: (c) Retina

Explanation:
1. The retina has a pigmented epithelial layer next to the choroid and a neural layer.

Teacher's Note:
1. The cornea and the sclera are not pigmented.

Question 4: Rhodopsin is a constituent of:
(a) Cornea
(b) Choroid
(c) Rods
(d) Cones
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Answer: (c) Rods

Explanation:
1. Rhodopsin (visual purple) is the photopigment of the rod cells.

Teacher's Note:
1. It is made of opsin and retinal.

Question 5: If the source of bright light in front of the eye suddenly becomes bright:
(a) Pupil contracts
(b) Focus of lens changes
(c) Vitreous humor becomes liquid like
(d) Retina blood supply is cut off
Show Answer & Explanation

Answer: (a) Pupil contracts

Explanation:
1. The iris contracts its circular muscles and the pupil constricts to reduce the light entering.

Teacher's Note:
1. This is the pupillary reflex.

Question 6: The retina of the vertebrate eye consists of:
(a) Neurons and neuroglia
(b) Rods, cones, neurons and neuroglia
(c) Rods, cones and neuroglia
(d) Rods and cones
Show Answer & Explanation

Answer: (b) Rods, cones, neurons and neuroglia

Explanation:
1. The retina has photoreceptors (rods and cones), bipolar and ganglion neurons and supporting neuroglia.

Teacher's Note:
1. It is the neurosensory tunic.

Question 7: The focal length of the lens in the eye is controlled by:
(a) Vitreous humor
(b) Ciliary muscles
(c) Iris muscles
(d) Pupil
Show Answer & Explanation

Answer: (b) Ciliary muscles

Explanation:
1. The ciliary muscles change the curvature of the lens (accommodation) and so its focal length.

Teacher's Note:
1. Iris muscles control the pupil.

Question 8: Night blindness is caused due to:
(a) Hypermetropia
(b) Myopia
(c) Defective cornea
(d) Deficiency of rhodopsin in rods
Show Answer & Explanation

Answer: (d) Deficiency of rhodopsin in rods

Explanation:
1. Vitamin A deficiency lowers rhodopsin synthesis in rods, which impairs vision in dim light.

Teacher's Note:
1. Retinal comes from vitamin A.

Question 9: During night, when the intensity of light is low, it is detected by:
(a) Rods
(b) Cones
(c) Both
(d) Crystalline lens
Show Answer & Explanation

Answer: (a) Rods

Explanation:
1. Rods are very sensitive and work in dim light.

Teacher's Note:
1. Cones need bright light.

Question 10: To correct myopia, one should use:
(a) Convex lens
(b) Concave lens
(c) Plane lens
(d) None
Show Answer & Explanation

Answer: (b) Concave lens

Explanation:
1. A concave (diverging) lens moves the image back onto the retina in myopia.

Teacher's Note:
1. Hypermetropia needs a convex lens.

Question 11: Where is the cavity of the vitreous humor found?
(a) Between sclerotic and choroid
(b) In front of lens
(c) Behind lens
(d) Between choroid and retina
Show Answer & Explanation

Answer: (c) Behind lens

Explanation:
1. The vitreous chamber lies behind the lens, between the lens and the retina.

Teacher's Note:
1. The aqueous chamber lies in front of the lens.

Question 12: The function of the iris is to:
(a) Alter the diameter of the pupil
(b) Close eyelids
(c) Secrete aqueous humor
(d) Move the lens
Show Answer & Explanation

Answer: (a) Alter the diameter of the pupil

Explanation:
1. The iris is a pigmented muscular diaphragm that regulates the size of the pupil.

Teacher's Note:
1. The ciliary body secretes aqueous humor.

Question 13: The pigment found in rods is:
(a) Rhodopsin
(b) Melanin
(c) Photosin
(d) Keratin
Show Answer & Explanation

Answer: (a) Rhodopsin

Explanation:
1. Rhodopsin is the photopigment of the rods.

Teacher's Note:
1. Cones have iodopsins.

Question 14: Which pigment helps some nocturnal animals to see at night?
(a) Haemoglobin
(b) Porphyrin
(c) Guanine
(d) Heparin
Show Answer & Explanation

Answer: (c) Guanine

Explanation:
1. Guanine crystals in the tapetum lucidum reflect light and improve night vision.

Teacher's Note:
1. This gives eye shine.

Question 15: The eye is most sensitive to wavelengths of about:
(a) 20 angstrom
(b) 1000 angstrom
(c) 5000 angstrom
(d) 7000 angstrom
Show Answer & Explanation

Answer: (c) 5000 angstrom

Explanation:
1. The human eye is most sensitive to light of about 5000 angstrom (500 nm), the green-yellow region.

Teacher's Note:
1. Visible light is 4000 to 7000 angstrom.

Question 16: The area of most active vision in the eye where a sharp image is formed is called:
(a) Blind spot
(b) Yellow spot
(c) Lens
(d) Pupil
Show Answer & Explanation

Answer: (b) Yellow spot

Explanation:
1. The yellow spot (macula lutea) with the fovea has the most cones and the highest visual acuity.

Teacher's Note:
1. The blind spot has no photoreceptors.

Question 17: The blind spot in the eye is located:
(a) In the centre of the pupil
(b) In the centre of the lens
(c) In the fovea centralis
(d) Where the optic nerve leaves the retina
Show Answer & Explanation

Answer: (d) Where the optic nerve leaves the retina

Explanation:
1. There are no rods or cones where the optic nerve leaves the eye, so no image forms there.

Teacher's Note:
1. It is also called the optic disc.

Question 18: The lens and retina of the vertebrate eye develop from:
(a) Mesoderm
(b) Ectoderm
(c) Endoderm
(d) Partly from ectoderm and partly from endoderm
Show Answer & Explanation

Answer: (b) Ectoderm

Explanation:
1. The lens develops from surface ectoderm and the retina from the neural ectoderm of the optic cup.

Teacher's Note:
1. Both are ectodermal.

Question 19: The common defect of the eye which develops in old age is:
(a) Glaucoma
(b) Astigmatism
(c) Presbyopia
(d) Myopia
Show Answer & Explanation

Answer: (c) Presbyopia

Explanation:
1. With age the lens becomes less elastic and the ciliary muscles weaken, which makes near vision difficult (presbyopia).

Teacher's Note:
1. It is corrected using convex lenses.

Question 20: Ciliary muscles are found at the:
(a) Junction of choroid and iris in the eye ball
(b) Inside the larynx
(c) Between ribs
(d) Base of cilia in ciliated epithelium
Show Answer & Explanation

Answer: (a) Junction of choroid and iris in the eye ball

Explanation:
1. The ciliary body at the junction of the choroid and iris contains the ciliary muscles.

Teacher's Note:
1. They hold the suspensory ligaments of the lens.

Question 21: The aperture controlling the light entering the eye is called:
(a) Iris
(b) Pupil
(c) Blind spot
(d) Sclerotic layer
Show Answer & Explanation

Answer: (b) Pupil

Explanation:
1. The pupil is the central opening of the iris through which light enters.

Teacher's Note:
1. The iris controls its size.

Question 22: Myopia is a defect in human eyes in which the image is formed:
(a) Behind the retina and can be corrected by convex lens
(b) Behind the retina and can be corrected by concave lens
(c) In front of the retina and can be corrected by concave lens
(d) In front of the retina and can be corrected by convex lens
Show Answer & Explanation

Answer: (c) In front of the retina and can be corrected by concave lens

Explanation:
1. In myopia the eyeball is long or the lens too powerful, so the image forms in front of the retina. A concave lens corrects this.

Teacher's Note:
1. Myopia is short sight.

Question 23: The convex lens is used to correct:
(a) Hypermetropia
(b) Myopia
(c) Cataract
(d) Glaucoma
Show Answer & Explanation

Answer: (a) Hypermetropia

Explanation:
1. In hypermetropia (long sight) the image falls behind the retina, and a convex lens brings it forward.

Teacher's Note:
1. Cataract is clouding of the lens and needs surgery.

Question 24: Owls move freely during the night since they have:
(a) Adjustable pupil
(b) Only cones in retina
(c) Only rods in retina
(d) Vitamin A deficiency
Show Answer & Explanation

Answer: (c) Only rods in retina

Explanation:
1. Owls have only rods, which are sensitive in dim light.

Teacher's Note:
1. Pigeons have only cones.

Question 25: Which one of the following diseases in man belongs to the same category as haemophilia?
(a) Hypermetropia
(b) Rabies
(c) Night blindness
(d) Colour blindness
Show Answer & Explanation

Answer: (d) Colour blindness

Explanation:
1. Haemophilia and colour blindness are both X-linked recessive genetic disorders.

Teacher's Note:
1. Rabies is infectious and night blindness is nutritional.

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Multiple Choice Questions (MCQs) for NEET Biology Sensory Organs

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