Life sciences Grd 12 Test your self – paper 1 June 2018

Which part of the male reproductive system secretes testosterone?

A  Cowper’s glands

B  Prostate gland

C  Testis

D  Epididymis

Which ONE of the following represents the CORRECT sequence of development in humans?
A  Zygote – morula – blastocyst – foetus
B  Morula – blastocyst – zygote 0 foetus
C Foetus – morula-  blastocyst –  zygote
D Zygote – foetus –  morula – blastocyst

A function of the medulla oblongata is to …

A control higher thought processes.
B regulate blood glucose levels.
C regulate breathing.
D inhibit voluntary movement.

A disorder of the brain that is characterised by memory loss and confusion is …
A Alzheimer’s disease.
B haemophilia.
C multiple sclerosis.
D Down syndrome.

Which ONE of the following is a part of the ear where grommets are inserted?
A Oval window
B Semi-circular canal
C Tympanic membrane
D Pinna

Depth perception refers to the ability to judge distance. An investigation was carried out to determine the effect of using  one eye only or both eyes on depth perception.
Participants were asked to thread a needle as a test of depth perception.

The number of attempts needed to successfully thread the needle was counted when using one eye only and then when using both eyes. The results of the investigation are provided in the table below.

The results of this investigation show that …
A binocular vision reduces depth perception.
B using one eye only increases depth perception.
C the number of eyes used has no effect on depth perception.
D binocular vision increases depth perception.

Which ONE of the following refers to a part of the nervous system
that is involved in the regulation of body temperature?
A Corpus callosum
B Cerebellum
C Hypothalamus
D Spinal cord

DBE/2018
A person experiences the following symptoms:
• Loses weight easily
• Is always hungry
• Never feels cold
The most likely explanation for this combination of symptoms is
that the person …
A secretes too much growth hormone.
B has an overactive thyroid gland.
C is diabetic and just had an insulin injection.
D has an underactive hypothalamus. Please turn over

The diagram below represents a cell during the early stages of prophase I.

“Which diagrams, (i) to (iv), are possible representations of the” chromosomes at the poles of the cell during telophase I of normal meiosis?
A (iii) and (iv) only
B (i) and (ii) only
C (i) and (iii) only
D (i), (ii) and (iv) only