Life Science Questions And Answers

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Life Sciences/P1

3
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DBE/Feb. – Mar. 2011

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

(6 x 2)

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(12)

Life Sciences/P1

1.2

5
NSC

DBE/Feb. – Mar. 2011

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 related

1.2.3

Structure in the sperm cell containing enzymes that break down the membrane of the ovum

1.2.4

The release of an ovum from a follicle

1.2.5

The period from fertilisation to birth

1.2.6

The tube that transports the sperm from the testis to the urethra

1.2.7
1.3

All the genes in all the chromosomes of a particular species

A hormone produced in females to stimulate milk production

(7)

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 – 1.3.5) in the ANSWER BOOK.
COLUMN I
1.3.1 Possible ways of improving of

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