Class 10 Sense Organs Mock Test (ICSE)

Topics in Sense Organs

• Structure of the eye
• Defects of vision and their correction
• Structure of the ear
• Hearing and balance

Sense Organs practice questions with answers

1. Q1Multiple choice·1 mark
   The middle layer of the eyeball that contains blood vessels to nourish the eye and absorbs stray light to prevent internal reflection is the:

   1. (a)Sclera
   2. (b)Choroid
   3. (c)Cornea
   4. (d)Retina
   Show answer and step marks

   1. Correct option: (b) Choroid+1

   Answer: (b)
2. Q2Multiple choice·1 mark
   The part of the human ear responsible for dynamic balance (body balance during movement) is the:

   1. (a)Utriculus and sacculus
   2. (b)Cochlea
   3. (c)Eustachian tube
   4. (d)Semi-circular canals
   Show answer and step marks

   1. Correct option: (d) Semi-circular canals+1

   Answer: (d)
3. Q3Multiple choice·1 mark
   Myopia or short-sightedness can be corrected by using a:

   1. (a)Convex lens
   2. (b)Cylindrical lens
   3. (c)Bifocal lens
   4. (d)Concave lens
   Show answer and step marks

   1. Correct option: (d) Concave lens+1

   Answer: (d)
4. Q4Multiple choice·1 mark
   The actual receptors for hearing (auditory receptors) are present in the:

   1. (a)Utriculus and sacculus
   2. (b)Organ of Corti
   3. (c)Eustachian tube
   4. (d)Semicircular canals
   Show answer and step marks

   1. Correct option: (b) Organ of Corti+1

   Answer: (b)
5. Q5Long answer·4 marks
   Answer the following questions regarding the human ear: (a) Name the three ear ossicles in correct anatomical sequence starting from the tympanic membrane, and state their collective function. (b) Give the exact location and function of the Eustachian tube.
   Show answer and step marks

   1. (a) Sequence from the tympanic membrane: Malleus, Incus, Stapes.+1
   2. (a) Collective function: they amplify the sound vibrations and transmit them from the eardrum to the inner ear (oval window).+1
   3. (b) Location: the Eustachian tube connects the middle ear cavity to the pharynx (throat).+1
   4. (b) Function: it equalises the air pressure on either side of the tympanic membrane (eardrum).+1

   Answer: (a) Malleus, Incus, Stapes; together they amplify sound vibrations and transmit them from the eardrum to the inner ear. (b) It connects the middle ear to the pharynx and equalises air pressure on both sides of the eardrum.
6. Q6Long answer·4 marks
   Answer the following questions regarding the human ear: (a) Name the three main divisions of the human ear. (b) State the exact location and function of the Eustachian tube. (c) Name the three ear ossicles in their correct anatomical sequence starting from the tympanic membrane.
   Show answer and step marks

   1. (a) Outer ear, Middle ear, and Inner ear.+1
   2. (b) Location: it connects the middle ear cavity to the pharynx.+1
   3. (b) Function: it equalises air pressure on either side of the eardrum (tympanic membrane).+1
   4. (c) Malleus, Incus, and Stapes.+1

   Answer: Divisions: Outer, Middle, Inner ear; Eustachian tube connects middle ear to pharynx and equalizes pressure; Ossicles: Malleus, Incus, Stapes.

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