Life Sciences Paper 1

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NATIONAL
SENIOR CERTIFICATE

GRADE 12

LIFE SCIENCES P1
FEBRUARY/MARCH 2011

MARKS: 150
TIME: 2½ hours

This question paper consists of 14 pages.

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Life Sciences/P1

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INSTRUCTIONS AND INFORMATION
Read the following instructions carefully before answering the questions. 1.

Answer ALL the questions.

2.

Write ALL the answers in your 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 question.

6.

Do ALL drawings in pencil and label them in blue or black ink.

7.

Draw diagrams or flow charts only when asked to do so.

8.

The diagrams in this question paper are NOT necessarily drawn to scale.

9.

Do NOT use graph paper.

10.

You may use a non-programmable calculator, protractor and a compass.

11.

Write neatly and legibly.

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SECTION A
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 – D) next to the question number (1.1.1 – 1.1.6) in the ANSWER BOOK, for example 1.1.7 D.

1.1.1

The process in which male gametes are formed in humans is
called …
A
B
C
D

1.1.2

When the first child of two parents, without any visible genetic disorder, was born, the child was found to have a serious genetic disorder. The parents were told that a recessive gene had caused the disorder, and that only one pair of genes was involved. If they had a second child this child …

A
B
C
D

1.1.3

was certain to have the disorder.
had a 1 in 2 chance of having the disorder.
had a 1 in 4 chance of having the disorder.
no chance of having the disorder.

Below is a set of steps following fertilisation in humans. Which is the CORRECT order of events?
1.
2.
3.
4.
A
B
C
D

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vasectomy.
spermatogenesis.
oogenesis.
mitosis.

The embryo is embedded in the uterine wall in humans.
A zygote is formed in the Fallopian tube.
Cell division occurs to form a ball of several hundred cells. The blastocyst remains free for several days in the uterus.
2, 3, 4, 1
2, 1, 3, 4
3, 2, 4, 1
1, 3, 2, 4

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QUESTIONS 1.1.4 and 1.1.5 refer to the graph below which shows the growth of the follicle and the ovarian hormone levels.
Hormonal regulation of the menstrual cycle
Growth of follicle
B
A
Ovarian
hormone levels

0

1.1.4

21

28

Progesterone and LH
FSH and LH
Oestrogen and progesterone
Oestrogen and FSH

What is the follicle called after day 14?
A
B
C
D

1.1.6

14

Which hormones are represented by A and B?
A
B
C
D

1.1.5

7

Primary follicle
Graafian follicle
Secondary follicle
Corpus luteum

A ring of DNA (plasmid) is taken from a bacterial cell to produce insulin. The steps which follow are NOT in the correct order below. 1. The gene for insulin is removed from a cell of a human
pancreas.
2. The bacteria make clones of themselves and produce
insulin.
3. The insulin gene is put into the plasmid and into a new
bacterial cell.
4. The bacterial plasmid is cut using enzymes.
The CORRECT order of the steps is …
A
B
C
D

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3, 2, 4, 3.
3, 2, 4, 3.
4, 1, 3, 2.
4, 2, 1, 3.

(6 x 2)

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1.2

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Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 – 1.2.7) in the ANSWER BOOK.
1.2.1
1.2.2

An arrangement of black bars representing DNA fragments that can be used to determine whether people are...
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