Eye

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Eye

This section covers the human eye

Which part of the eye absorbs excess light? *

2 points

retina

blind spot

choroid

optic nerve

Which diagram, with a corresponding reason, represents a person looking at an object 10 meters away? *

2 points

Diagram A because the suspensory ligaments are taut/tight and the lens is less convex

Diagram A because the lens is more convex and the suspensory ligaments are slack

Diagram B because the lens is more convex and the suspensory ligaments are slack

Diagram B because the suspensory ligaments are taut/tight and the lens is less convex

A function of the iris of the eye is to... *

2 points

refract light to form a clear image

control the amount of light that enters the eye

convert the light stimuli into impulses

prevent reflection of light within the eye

The results of this investigation show that... *

2 points

binocular vision reduces depth perception

using one eye only increases depth perception

the number of eyes used has no effect on depth perception

binocular vision increases depth perception

The general conclusion that can be made from the data is that... *

2 points

as the distance from the eye increased up to 100 cm, the thickness of the lens increased, after which it remained constant

as the distance from the eye decreased, the thickness of the lens remained constant

as the distance from the eye increased up to 100 cm, the thickness of the lens decreased, after which it remained constant

the thickness of the lens increased with an increase in distance from the eye

Which TWO diagrams above show the result when the ciliary muscles contract and the circular muscles of the iris relax? *

2 points

The diagram above shows the human eye under different conditions

1 and 3

3 and 2

1 and 4

4 and 2

A learner conducted an investigation to determine the percentage of people that are long-sighted. The factor that is LEAST likely to affect such an investigation is the... *

2 points

light intensity of the room in which the test was conducted

height of the people

age of the people in the sample

distance between the tool used to test the sight and the person being tested

Which ONE of the following is a part of the ear where grommets are inserted? *

2 points

Oval window

Semi-circular canal

Tympanic membrane

Pinna

Which ONE of the following represents the CORRECT combination of a visual defect, its nature and the corrective measure?

2 points

Clear selection

Which ONE of the following objects is closest to the human eye? *

2 points

The graph above shows the curvature of the human lens when viewing objects at different distances

How was the validity of the investigation below decreased? *

2 points

The person's reaction time was measured in the absence of alcohol the first time

reaction time was measured by the time it took to catch a ruler

reaction time was measured in different light conditions

only ten measurements were recorded

Which ONE of the following represent the correct sequence in which the changes occur? *

2 points

(i) -> (ii) -> (iii) -> (iv)

(ii) -> (iv) -> (iii) ->(i)

(i) -> (iii) -> (ii) -> (iv)

(ii) -> (iii) -> (i) -> (iv)

When a person spends most of his/her time looking at a cellphone or a computer screen the ciliary muscles of the eye are in a constant state of contraction. The muscles cannot return to their relaxed position. As a result the muscles are unable to change the... *

2 points

Shape of the lens to focus on distant objects

shape of the lens to focus on nearby objects

size of the pupil to let morel ight into the eye

size of the pupil to reduce the amount of light entering the eye

A person with a middle ear infection is usually advised not to fly in an aeroplane because the...

2 points

maculae in the semi-circular canals are unable to receive the stimulus

round window is unable to absorb sound waves, leading to echoes

Eustachian tube is unable to equalise the pressure on either side of the tympanic membrane

optic nerve will be damaged, leading to hearing loss

Clear selection

Which ONE of the following statements is CORRECT regarding the eyes represented in the diagram below?

2 points

Clear selection

A light stimulus is converted into a nerve impulse in the...

2 points

iris

retina

optic nerve

sclera

Clear selection

Which ONE of the following occurs when you look up from reading a book on a clear, sunny day to focus on a mountain more than 100 meters away>

2 points

Radial muscles of the iris contract

Pupil becomes dilated

Ciliary muscles relax

Lens becomes more convex

Clear selection

Which ONE of the following is the dark-coloured layer of the eye, which is rich in blood vessels? *

2 points

Conjunctiva

Sclera

Cornea

Choroid

Which ONE of the following parts of the eye contains the photoreceptors? *

2 points

Retina

Iris

Sclera

Vitreous humour

Which structures in the eye are responsible for the refraction of light? *

2 points

Pupil and Iris

Blind spot and yellow spot

Cornea and lens

Sclera and suspensory ligaments

Colour vision is difficult at night, because under dim light conditions... *

2 points

rods are not stimulated

the pupil dilates

cones are not stimulated

the lens cannot change shape

Clear form

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