BIOLOGY SENSE ORGANS
Topic 9: Senses; Human Eye 7. Where are the greatest concentrations of cone
receptors found?
1. What is the receptor? Receptors are structures A) In the sclera B) In the fovea ++
specialized to receive certain environmental stimuli C) In the choroid D) In the iris
and change them into nerve impulses. E) In the cornea
Topic 10: External Structure of Eye and Eye Defects
1. Explain the structures and functions of the following
terms:
2. How many receptor organs are found in human and a) Orbit: cavity where eye is located, protects eye from
what are they? There are 5 receptor organs, the external hazards
eye, ears, skin, nose and tongue.
b) Eyelid: protect eye from harm like dust
3. As the light passes into human eye, it goes c) Eyebrows: an eyelid is a thin fold of skin that covers and
through which of the following first? protects the eye. It’s vital that the surface of the eye (the
A) Pupil B) Cornea ++ cornea) remains constantly moist, so the eyelid is
C) Lens D) Retina responsible for spreading the tear film evenly across the
E) Choroid surface:
4. Write the parts of eye structure.
e) Tear Apparatus: moistens the eye sphere
2. What is the problem in Myopia eye defect? Explain.
Myopia is a vision condition in which people can see close
objects clearly, but objects farther away appear blurred.
3. Which eye defect can be corrected by using convex
lens?
A) Hypermetropia ++ B) Astigmatism
C) Myopia D) Night blindness
A. …lens……………………………………… E) Cataract
B. …ciliary zonule………………………………………
4. What is the Cataract? A cataract is a clouding of the
C. anterior chamber…………………………………… normally clear lens of your eye.
D. …cornea………………………………………
E. …retina………………………………………
G.…blind spot………………………………………
5. _Myopia__________ is an eye defect in which the image
F. …optic nerve……………………………………… focuses in front of the retina.
5. What is the name of the layer that gives white 6. In hypermetropia the image focuses _behind of the
color to eye ball? retina______________.
A) Cornea B) Sclera ++
C) Choroid D) Fovea 7. Because of uneven cornea the image is constantly
E) Retina unclear.
This condition is called ____Astigmatism______________.
6. What is the main function of the Cone cells in the 8. Due to age the lenses lose their elasticity. This condition
eye? is known as _____Prestism___________.
A) color vision B) vision in full sunlight ++
C) vision in dim light D) under water vision 9. Eye defect’s properties:
E) none of the above ▪ Light rays focus in front of retina
Date: ____/_____________/ 2012 Signature: _____________________
BIOLOGY SENSE ORGANS
▪ Eye ball is longer than normal condition B) Hypermetropia (Far Sightedness)
▪ Eye defect can be corrected by wearing glasses C) Astigmatism
with concave lenses. D) Prestism
According to above explanations, what is the name E) Color Blindness
of eye defect? Myopia
10. Which kind of problem causes colorblind disease in
A) Myopia (Nearsightedness) human body?
Topic 11: The Ears
1. What is / are the function (s) of the ears? Hearing
and maintaining equilibrium.
2. Complete the table about the ear parts given
below.
Function
Outer Ear Directs sound waves to tympanic
membrane
A: pinna C: Ear Drum
Middle Ear Picks up and amplifies sound waves B: External Canal
D: Hammer E: Stirrup F: Anvil
H: G: I: Cochlea
Inner Ear Hearing and maintenance of equilibrium semicircula Eustachian
r canals K: Tube
Auditory
3. What is the role of ear about body balance? Explain.
nerve
The semicircular canals contain liquid, and when we
Topic 12: The Skin
tilt our head as for example the liquid moves
maintaining the body’s balance.
1. State the functions of skin. Some functions are:
protection of inner layers of the body, prevention of water
loss, gas exchange, secretion of fat, etc.
4. Which of the following is not the property of the
eardrum?
A) It separates the outer from the middle ear. B)
2. Write the parts and layers of skin
The eardrum has two states: relaxed and
contracted.
C) It is composed of collagen fibers.
D) It converts the vibration into the impulses. ++
E) It has contact with ear bones.
5. A baby is born without otoliths in the ears. What
would expect the baby’s sensory?
A) Totally deaf
B) Unable to determine the direction of sound ++
C) Unable to determine the position of the head with
respect to gravity
D) Unable to produce vibration of sound
E) All of the above
6. Label the parts of ear given figure below.
A. …sweat gland………………………………………………
B. …fat………………………………………………………
C. …sebaceous gland…………………………………………
D. …nerve………………………………………………………
Date: ____/_____________/ 2012 Signature: _____________________
BIOLOGY SENSE ORGANS
E. ………hair root……………………………… Which of the following combination describes the size of
the structures above in ascending order?
F. ………dermis………………………………………H.
A) I-II-III B) III-II-I C) III-I-II++
………epidermis…………………………………… D) II-I-III E) I-III-II
3. Which kind of receptors is found in olfactory region?
3. Outermost layer of skin is A) Termoreceptor B) Photoreceptor
_________epidermis___________. D) Mechanoreceptor D) Chemoreceptor ++
E) Georeceptor
4. The epidermis doesn’t contain ___blood
vessels________. 4. The human nasal mucosa may contain _______
million receptor cells.
5. Where is the melanin pigment located in the A) 10 B) 25 ++ C) 50 D) 80
skin?
A) In dermis and epidermis 5. The message of smell is carried to the brain by the
B) In malphigian layer __________.
C) Everywhere in upper skin ++ A) Nasal chamber B) Auditory nerve
D) Everywhere in lower skin C) Olfactory nerve ++ D) Nostrils
E) In fat glands E) Optic nerve
6. Our skin is an effective barrier against invasion 6. Which of the following is NOT one of four tastes we
by bacteria because___. detect on our tongues?
A) It is a tough mechanical barrier A) Sweet B) Hot ++ C) Salty
B) It secretes substances that are toxic to some D) Bitter E) Sour
bacteria C) Upper layers of cells are constantly
worn away, taking bacteria with them+++ 7. Four types of taste buds are delivered on our tongue 4
D) It is composed of many layers of cells different regions. Show their locations on the image?
E) All of the above
7. The skin contains two types of glands, they are:
______sweat______________,
____sebaceous______________.
8. Which one of the following is NOT a function of
skin?
A) Protection B) Sensory
C) Excretion D) Manufacture of vitamin D
E) Containing chemoreceptor ++
green: bitter
Red : sour Blue: Salty Orange: Sweet
1. Write the parts of nose.
A) ……olfactory bulb…………………………………….
B) ……olfactory epithelium………………………..
C) ……nasal cavity……………………………………..
2. I. Papilla
II. Taste bud
III. Receptor
Date: ____/_____________/ 2012 Signature: _____________________
