Special Senses Worksheet

Chapter 15 The Senses

1. The diagram shows an eye of a mammal. In the table below add the names of the structures indicated by the letters.




 * '''CHOICES: Aqueous humour; choroid; conjunctiva; fovea; optic nerve; cornea; iris; lens; retina; sclera; vitreous humour; pupil

'''

2.Insert the correct term in the table below. Some terms may be used more than once.


 * CHOICES: Aqueous humour; Choroid; Conjunctiva; Iris; Fovea; Optic nerve; Blind spot; Cornea;                   Sclera;   Retina;  Vitreous humour;  Pupil;   Nictitating membrane

3. Are these statements about the eye true or false? If false give the correct answer.
 * 1. 	Prey animals like the rabbit have a large area of binocular vision. T/F
 * 2. 	The rods of the retina function in dim light and do not respond well to colour. T/F
 * 3. 	The lacrimal glands secrete fluid that washes the outer surface of the eye and keeps it moist. T/F
 * 4. 	The conjunctiva is the inner lining of the eyeball. T/F
 * 5. 	When the eye focuses both the lens and the cornea change in shape. T/F
 * 6. 	The cones of the retina are more numerous in the region of the eye known as the fovea. T/F
 * 7. 	Vitamin E is required in the diet to make the visual pigment found in the cells of the retina. T/F
 * 8. 	The size of the pupil changes in different light intensities. T/F
 * 9. 	The parasympathetic nervous system brings about dilation (expansion)of the pupil. T/F
 * 10. 	Nocturnal animals are usually colour-blind. T/F

4. Match the terms in the list below to the descriptions in the table.
 * Auditory ossicles; Pinna;  Tympanic membrane;  Cochlea;  Ear canal;  Eustachian tube;  Vestibular organ;   Middle ear   Inner ear; Auditory nerve

5. The diagram below shows an ear of a mammal. Add the labels below to the diagram.


 * Auditory ossicles; Pinna;  Tympanic membrane;  Cochlea;  Ear canal; Eustacian tube;    Semicircular canals;   Outer ear; Middle ear; Inner ear;   Auditory nerve



6. Rearrange these parts of the ear in the order in which sound waves travel to stimulate the cochlea.
 * Auditory ossicles; Tympanic membrane;  Ear canal;   Inner ear

7. Complete the statements below by adding the words in bold.

tongue;   temperature;    otoliths;   olfactory;   hairs;   nose;   pressure;  vestibular; touch; cerebellum;  semicircular canals


 * There are two parts to the vestibular organ. The first part consists of the ..................... which respond to changes in speed and direction of movement of the body.
 * The canals are filled with fluid and fine ...................... that are stimulated when the head moves.
 * The receptor cells send nerve impulses along the ......................nerve to the .....................in the brain.
 * The otolith organs form the second part of the vestibular organ. They contain tiny pieces of chalk called .........................that stimulate hair cells and tell the animal which way up it is.
 * The special sense organ for taste are located on the ........................
 * The sensory cells concerned with smell are called the ......................organ. This is located in the ..................
 * In the skin, cells that sense ...................., ......................and ..................are found.

Special Senses Worksheet Answers