SEPTEMBER 2019 LIFE SCIENCES P1 - Modern Classroom

NATIONAL

SENIOR CERTIFICATE

GRADE 12

SEPTEMBER 2019

LIFE SCIENCES P1

MARKS:

150

TIME:

2? hours

*LFSCE1*

This question paper consists of 16 pages.

(EC/SEPTEMBER 2019)

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LIFE SCIENCES P1

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 answer 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, tables 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

where necessary.

11.

Write neatly and legibly.

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LIFE SCIENCES P1

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SECTION A

QUESTION 1

1.1

Various options are provided as possible answers to the following questions.

Choose the answer and write only the letter (A¨CD) next to the question number

(1.1.1¨C1.1.10) in the ANSWER BOOK, for example 1.1.11 D.

1.1.1

Which ONE of the following forms part of the placenta?

A

B

C

D

1.1.2

Chorion

Amnion

Umbilical cord

Uterus

The list below represents some reproductive strategies in animals:

(i)

(ii)

(iii)

(iv)

Amniotic egg

External fertilisation

Oviparous development

Altricial development

Which of the strategies above are applicable to chickens?

A

B

C

D

1.1.3

(i) and (ii) only

(i) and (iii) only

(i), (ii) and (iii) only

(i), (ii) and (iv) only

The diagram below represents a process that takes place during meiosis.

Which ONE of the following statements correctly describes the process?

A

B

C

D

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The process is crossing over and it results in genetically identical

gametes

The process is nondisjunction and it results in gametes with the

same number of chromosomes

The process is crossing over and it results in genetically different

gametes

The process is nondisjunction and it results in gametes with an

abnormal number of chromosomes

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LIFE SCIENCES P1

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The table below shows the average lengths of human foetuses.

TIME (weeks)

FOETAL LENGTH (cm)

Female

Male

1

1

13

14

31

33

43

46

49

51

8

16

24

36

40

Which of the following statements about the information in the table is

correct?

A

B

C

D

1.1.5

The female foetuses grow at the same rate as the male foetuses.

The female foetuses grow faster than the male foetuses.

The male foetuses grow faster than the female foetuses in the

beginning and then the female foetuses will grow faster than the

males at the end.

The male foetuses grow faster than the female foetuses.

The diagram below shows two eyes focused on objects at different

distances from the eye.

M N

O P

X

Q R

S T

Y

The objects on which eye X and Y are focused are ¡­

A

B

C

D

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N and R respectively.

M and T respectively.

O and S respectively.

M and R respectively.

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1.1.6

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LIFE SCIENCES P1

(EC/SEPTEMBER 2019)

The diagram below shows the development of a zygote in humans.

Development of the zygote

1

2

3

4

5

6

The correct sequence of the structures is:

A

B

C

D

1.1.7

Which part of the brain interprets the information from the cristae?

A

B

C

D

1.1.8

menstruation.

puberty.

menarche.

menopause.

Which combination of structures below indicates the correct sequence

in which the sperm travels to meet the ovum in a human female?

A

B

C

D

1.1.10

Cerebellum

Cerebrum

Medulla oblongata

Corpus callosum

The onset of the reproductive age is called ¡­

A

B

C

D

1.1.9

1, 4, 2, 3, 5, 6

6, 4, 2, 5, 3, 1

2, 4, 5, 1, 6, 3

2, 5, 4, 1, 6, 3

Vagina ¡ú cervix ¡ú uterus ¡ú fallopian tube

Vagina ¡ú fallopian tube ¡ú cervix ¡ú uterus

Vagina ¡ú uterus ¡ú cervix ¡ú fallopian tube

Vagina ¡ú fallopian tube ¡ú uterus ¡ú cervix

The list below shows the characteristics of a sperm cell:

(i)

(ii)

(iii)

(iv)

Head with nucleus

Enzyme-rich structure in the head

Many mitochondria

Movable tail

Which of the above characteristics enables the sperm cell to move?

A

B

C

D

(i), (iii) and (iv) only

(ii), (iii) and (iv) only

(ii) and (iii) only

(iii) and (iv) only

(10 x 2) (20)

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