GRADE 12
LIFE SCIENCES
INFORMAL TEST 4 (REPRODUCTION)
MARKS: 50
TIME: 50 minutes
This question paper consists of 6 page
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Life 2 April
Sciences NSC – Grade 12 Informal 2021
INSTRUCTIONS AND INFORMATION test 4
Read the following instructions carefully before answering the questions.
1. Answer ALL the questions.
2. Write ALL the answers in the ANSWER BOOK.
3. Start the answers to EACH question at the top of a NEW page.
4. Number the answers correctly according to the numbering system
used in this question paper.
5. Present your answers according to the instructions of each
6. question. Do ALL drawings in pencil and label them in blue or
7. black ink.
8. Draw diagrams or flow charts only when asked to do so.
9. The diagrams in this question paper are NOT necessarily drawn to
10. scale. Do NOT use graph paper.
You must use a non-programmable calculator, protractor and a
11. compass, where necessary.
Write neatly and legibly.
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SECTION A test 4
QUESTION 1
1.1 Various options are provided as possible answers to the following
questions. Choose the correct answer and write only the letter (A to D)
next to the question
number (1.1.1 to 1.1.2) in the ANSWER BOOK, for example 1.1.3 D.
1.1.1 The specialised cells of the testes that secrete the male
hormone are…
A Sertoli
B cells.
C Acrosomes
D . Leydig
cells.
Seminal
vesicles.
1.1.2 What is the name of the hormone that promotes the
production of
follicles in the ovary?
A AD
B H
C FSH
D LH (4)
TSH (2 x 2)
1.2 Give the correct biological term for each of the following descriptions.
Write only
the term next to the question number (1.2.1 to 1.2.3) in the ANSWER
BOOK.
1.2.1 The attachment of the blastocyst to the wall of the
1.2.2 endometrium The production of ova through meiosis
1.2.3 The membrane that forms finger-like projections which grows
into the uterine wall
(3 x 1) (3)
1.3 Indicate whether each of the statements in COLUMN I applies to A only, B
only, both A and B or none of the items in COLUMN II. Write A only, B
only, both A
and B, or none next to the question number (1.3.1 to 1.3.8) in the
ANSWER BOOK.
COLUMN I COLUMN II
1.3.1 The development in some birds where A Precocial
the B Altricial
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Sciences NSC – Grade 12 Informal 2021
young that hatch are mobile and
test 4
independent
1.3.2 Place where fertilisation occurs in A Cervix
humans Fallopian
B tube
1.3.3 Parts of a spermatozoa A Acrosome
B Tail
(3 x 1) (3)
TOTAL SECTION A: 10
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Sciences NSC – Grade 12 Informal 2021
SECTION B test 4
QUESTION 2
2.1 The diagram below shows a type of fertilisation taking place in a fish.
The fish released a large number of eggs to be fertilised.
2.1.1 State the type of fertilisation illustrated above. (1)
2.1.2 State TWO visible ways in which the chances of fertilization in
these fish
are increased. (2)
2.1.3 Explain TWO adaptations of the amniotic egg for reproduction (4)
2.1.4 What type of reproduction strategy is shown in the diagram (1)
above?
(8)
2.2 The diagram below represents the human female reproductive system.
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2.2.1 Identify parts B and C. test 4 (2)
2.2.2 State ONE function of part D. (1)
2.2.3 During tubal ligation, part A is surgically cut or tied. Explain
how this procedure prevents pregnancy. (3)
2.2.4 Give the NAME of:
(a) the part that breaks down when the level of progesterone (1)
drops.
(1)
(b)the part where zygote will be formed. (8)
16
QUESTION 3
3.1 Study the diagrams below and answer the questions that follow.
3.1.1 Name the parts labelled B, C and G. (3)
3.1.2 State ONE function each of C and F respectively. (2)
3.1.3 Explain why it is necessary for part D to hang outside the body
of the
male. (2)
3.1.4 Name the cells in the testes that secrete a male sex hormone. (1)
3.1.5 Describe what will happen to the ability to reproduce if the part
labelled
B is surgically cut out during vasectomy. (3)
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test 4
3.1.6 Describe the process through which the sperm cell is produced. (4)
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Sciences NSC – Grade 12 Informal 2021
test 4
3.1.7 State ONE way in which the process mentioned in QUESTION 3.1.6
differs from oogenesis. (2)
(17)
3.2 The diagram below represents two different human gametes.
3.2. Name the cell formed when G fuses with D. (1)
1
Which of the gametes (A or B), contributes mitochondria to (1)
3.2. the cell mentioned in QUESTION 3.2.1.
2
Name the part labelled H. (1)
3.2. Explain TWO structural adaptations of gamete B that allows it (4)
3 to fertilise gamete A. (7)
3.2. 24
4
TOTAL SECTION B: 40
GRAND TOTAL: 50
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