Gr 12 RESPONDING TO ENVIRONMENT- NERVOUS SYSTEM: EXAM BOOKLET MCQ PART 1

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Mrs Clulow

Mrs Vissian

Ms Viljoen

1.1. The part of the brain that regulates breathing is the... *

medullla oblongata.

cerebrum.

corpus callosum.

cerebellum.

1.2. Grommets may be used in the treatment of... *

astigmatism.

cataracts.

middle ear infections.

long-sightedness.

1.3. The part of the brain that interprets impulses from the retina of the eye is the... *

cerebrum.

cerebellum.

medulla oblongata.

corpus callosum.

1.4. Damage to the dendrites of a motor neuron in a reflex arc would probably prevent... *

a receptor from receiving a stimulus.

synaptic contact with a sensory neuron.

an impulse from being transmitted to an effector organ.

an impulse from being transmitted to the spinal cord.

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

iris.

retina.

optic nerve.

choroid.

1.6. Which part of the human brain controls balance and equilibrium? *

Cerebrum

Cerebellum

Medulla oblongata

Corpus callosum

1.7. The diagrams below show the human eye under different conditions. Which TWO diagrams show the result when the cilliary muscles contract and the circular muscles of the iris relax? *

1 and 3

3 and 2

1 and 4

4 and 2

1.8. 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... *

light intensity of the in which the test was conducted.

height of the person.

age of the people in the sample.

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

1.9. The part of the central nervous system that protects the human body from serious injuries when a person steps barefoot on a thorn is the... *

cerebellum.

medulla oblongata.

spinal cord.

cerebrum.

1.10. Which ONE of the following is the correct sequence in which impulses are transmitted in a reflex action? *

Receptor --> sensory neuron --> interneuron --> motor neuron --> effector

Receptor --> motor neuron --> sensory neuron --> interneuron --> effector

Receptor --> motor neuron --> interneuron --> sensory neuron --> effector

Receptor --> interneuron --> sensory neuron --> motor neuron --> effector

1.11. The pupil of a human eye is covered by the... *

cornea and retina.

conjunctiva and cornea.

conjunctiva and sclera.

retina and sclera

1.12. Which ONE of the following CORRECTLY matches a visual defect and its corrective treatment? *

Cataracts: concave lens

Short-sightedness: convex lens

Astigmatism: concave lens

Long-sightedness: convex lens

1.13. The part of the brain that is stimulated when a learner is exposed to a change in environmental temperature: *

Cerebellum

Cerebrum

Hypothalamus

Corpus callosum

1.14. Below is a list of changes that occur in the human eye when viewing an object closer than 6 meters. Which ONE of the following represent the correct sequence in which the changes take place? (i) The lens becomes more convex. (ii) The ciliary muscles contract. (iii) There is less tension on the lens. (iv) The suspensory ligaments slacken. *

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

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

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

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

1.15. 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... *

shape of the lens to focus on distant objects.

shape of the lens to focus on nearby objects.

size of the pupil to let more light into the eye.

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

1.16. The diagram below shows a reflex arc. Which part represents the effector? *

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

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.

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