# Life Sciences Grade 12 Paper 1 NSC June 2013 Memo

> Grade 12 Life Sciences Paper 1 memorandum from the NSC June 2013, 10 pages. Read online or get the free PDF download, question paper linked when available.

- Page: https://www.hlayiso.com/library/biology-p1-sg-2013-memo/e689a632-8e33-4b10-8d83-befc4eef3568
- Updated: 2026-09-27
- Subject: Life Sciences
- Grade: Grade 12
- Document type: Memorandum
- Year: 2013
- Exam period: NSC June
- Paper: 1
- Curriculum: CAPS
- Pages: 10

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## About this document

Life Sciences · Grade 12 · NSC June · 2013. Memorandum, 10 pages. Read online or download the PDF.

Read it free online on the page above; download the PDF from there.

## Document text

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### Page 1

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EDUCATION

basic educations -1.;

t: PRIVATE BAG X 14
Departmen’ PRETORIA

Basic Education PUBLI
REPUBLIC OF SOUTH APRIGAUNATIONS |

SENIOR CERTIFICATE EXAMINATION

BIOLOGY P1
STANDARD GRADE

2013
POSSIBLE ANSWERS

MARKS: 150

This memorandum consists of 10 pages.

Copyright reserved : Please turn over

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DEPARTMENT OF BASIC

Biology/SG/P1 2 EGue, 7. ;
SCE — Memorandum
2013 -08- 05
PRINCIPLES RELATED TO MARKING HG & SG BIOLOGY 2012 PRIVATE BAG X 110
1 if more information than marks allocated is given ana)
: ore info ion than mari Ci iv
Stop marking when maximum marks are reached and p' a bUBLIC ONS
the right-hand margin.
2. If, for example, three reasons are required and five are given
Mark the first three irrespective of whether ail or some are correct/incorrect.
3. \f whole process is given when only part of it is required
Read all and credit relevant parts.
4. if comparisons are asked for and descriptions are given
Accept if differences /similarities are clear.
5. If tabulation is required but paragraphs are given
Candidates will lose marks for not tabulating.
6. lf diagrams are given with annotations when descriptions are required
Candidates will lose marks.
7. if flow charts are given instead of descriptions
Candidates will lose marks.
8. If sequence is muddled and links do not make sense
Where sequence and links are correct, credit. Where sequence and links are
incorrect, do not credit. If sequence and links become correct again, resume credit.
9. Non-recognized abbreviations
Accept if first defined in answer. If not defined, do not credit the unrecognised
abbreviation but credit the rest of answer if correct.
10. Wrong numbering
if answer fits into the correct sequence of questions but the wrong number is given,
it is acceptable.
11. If language used changes the intended meaning
Do not accept.
12. Spetling errors
If recognizable, accept provided it does not mean something else in Biology or if it
is out of context.
13. If common names given in terminology
Accept provided it is accepted at the memo discussion.
Copyright reserved Please tum over

fe

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DEPARTMENT GF BASIC |
Biology/SG/P1 3 Epucaprag3 |
SCE — Memorandum “|
f
: ; 2013 -85- 05
14. If only letter is asked for and only name is given (and vice versa) .
No credit RIVATE BAG X 110
: PRETORIA 0001
15. If units are not given in measurements PUBLIC EXAMINATIONS
Candidates will lose marks. Memorandum will allocate marks for units separately.
16. Be sensitive to the sense of an answer, which may be stated in a different way.
17. Caption
All illustrations (diagrams, graphs, tables, etc.) must have a caption.
18. Code-switching of official languages (terms and concepts)
A single word or two that appears in any official language other than the learner's
assessment language used to the greatest extent in his/her answers should be
credited, if it is correct. A marker that is proficient in the relevant official language
should be consulted. This is applicable to all official languages.
19. | No changes must be made to the marking memoranda without consulting the
Provincial Internal Moderator who in turn will consult with the External
Moderator(s).
20. Only memoranda bearing the signatures of the UMALUSI moderators and
distributed by the National Department of Basic Education via the Provinces must
be used.
Copyright reserved Please turn over

fP

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Biology/SG/P1 4 | DEPARTMEDEE GR BASIC
SCE — Memorandum b EDUCATION
SECTION A 2013 -08- 95
PRIVAT!
QUESTION 4 PRETORIA Doo!”
PUBLIC EXAMINATIONS
14 144 AYY
1.1.2 Dvv
1130 AVY
114 BYY
1.15 cvy
1.1.6 Dvv
11.7 AVY
1.18 Cvv
1.1.9 cvv (9x2) (18)

1.2 1.2.1 Oxy-haemoglobinY
1.2.2 Mastication Vv
1.2.3 Peristalsis “
1.2.4 Macronutrients / macroelementsY
1.2.5 CristaeY
1.2.6 Medulla OblongataY

1.2.7 Anaerobic respiration” / fermentation
1.2.8 Lactic AcidY (8x1) (8)
1.3 1.3.1 Cvv
1.3.2 DY¥v
1.3.3 Byv
1.3.4 HYY
1.3.5 AvY
1.3.6 Fvv (6x2) (12)
1.4 1.4.1 (a) ProducersY (1)
(b) (secondary) consumers” (1)
1.4.2 (a) Spacey”
Watery
DiseasesV
Foodv/ nutrients /mineralsY
(Mark first TWO only) (Any 2 x 1) (2)
(b) Poor rainfall”
drought”
extreme temperature changes”
negative human activity” /(deforestation/acid rain/chemical
dumping/pollution)
any natural disasters” /(earthquake/floods/Tsunami/
hurricane / tornado/ volcanoes) (2)
(Mark first TWO only) (Any2x1) (6)
Copyright reserved Please turn over

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Biology/SG/P1 5 DBE/2013
SCE - Memorandum DEPARTMENT GF BASIC
EDUCATION |

1.5 1.5.1 Vitamin Av/Retinol

| 013 -06-
1.5.2 Nightblindness” H 2013 -08- 05
1.5.3 Scurvy” RETORIA 001
| PUBLIC EXAMINATIONS
1.5.4 Vitamin D v’/ Calciferol
155 Rickets” in children / osteomalacia in adults
15.6 Promotes clotting of blood “/ Formation of prothrombin (6)

TOTAL SECTION A: 50

SECTION B
QUESTION 2
21 2.1.1 The glucose concentration of the blood samples increases first”
(from 0 to 8 hours to 128 mg/4 00cm’) and then decreases” (from
42 hours to 82 mg/100cm*) (2)

2.1.2 The individual ate a meal” high” in carbohydrates/glucose”
(causing the blood glucose concentration to increase) (3)

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Biology/SG/P1 6 | DEPARTMEN IDOE ORBITS j
SCE - Memorandum EQUCATION {
2.1.3 | 2013 -05- 05
j PRIVATE BAG X 119
PRETORIA 0004
—— | __.PUBLIC EXAMINATIONS
Blood glucose concentration over a 24-hour
period

5 140

E120

c

ge 100

SZ 80

BE eo

oe

a 40

3 20

&

a 0

4 8 12 16 20 24
Time (h)

Rubric for the mark allocation of the graph:

A Correct type of graph 4
B Title of graph 2
Cc Correct label for X-axis 4
D Correct unit for X-axis 4
E Correct label for Y-axis 4
F Correct unit for Y-axis 1
G Appropriate scale for X-axis | 1
H Appropriate scale for Y-axis | 1
I Plotting of points 1 = 1 to 5 points plotted correctly
2 =All_ points plotted correctly
J All plotted points joined 1

NOTE:
If wrong type of graph drawn:
- Marks will be lost for 'correct type of graph'(A) and ‘plotting of points'(Il)and
all ‘plotted points joined’(J)
- If axes are transposed, marks will ONLY be lost for labelling and units for the
X-axis(C and D) and Y-axis (E and F) (12)
(17)

P Preethlall Please turn over

Copyright reserved UMALUSL

(F

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Biology/SG/P1

2.2 2.2.1
2.2.2

2.2.3
2.2.4

QUESTION 3
3.1 3.1.4

3.1.2

3.1.4
3.1.5

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7 DBE/2013
SCE - Memorandum DEPARTMENT OF BAS}
EQUCATION

4

i
Small intestine” i
7 i 2013 -08- 95
B : (circular) musclev’ layer iL PRIVATE BAG X 119
ETORIA OC
C- villusv” i ORIA ocot

D - Columnar epitheliumy PUBLIC EXAMINATIONS)

Succus entericusv// intestinal juice

-It is finger-like Vto ensure maximum absorption of digested
nutrients”

-has microvilli Vincreases the surface area for absorption”

-thin walls “consist of a single layer of columnar epithelial tissue
for the easy diffusion of nutrients”

-many blood capillaries and lacteal~’ for effective transport ¥

of absorbed nutrients

-secretion of mucus by goblet cells“ enhances diffusion”

(Mark first ONE only) (Any 1 x 2)

A- tracheaY

B - bronchusv/cartilaginous ring
D-ribsY

E - bronchiolesY

Protects internal organsv v /heartiungs
Helps in ventilation/breathingY “
(Mark first TWO only) (Any 2 x 2)

- Contracts” and flattensv

- increases the volume of the chest cavity”

- reduces pressure in lungs“ compared to pressure in the
atmosphere”

- air is drawn intov the lungs (max 3)

Fv -Intercostal muscles”

Lungs would collapse”

Lungs unable to expand/inflatew

no difference in pressure on lungsv/pressure inside equals
pressure outside

no mechanism for breathing/ventilation” /air cannot be drawn in
and out of the lungs (Any 3)

Please turn over

(1)

(2)
[25]

(4)

(4)

(3)
(2)

(3)
(16)

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Biology/SG/P1

3.2 3.2.1
3.2.2
3.2.3

3.2.4

QUESTION 4
41 4.1.1

4.1.2

4.13

4.2 4.2.1

4.2.2

4.2.3

4.3 4.3.1

4.3.2

4.3.3

4.3.4

Copyright reserved

8

SCE — Memorandum a

w
a Sas 8
To show that carbon dioxide” is given off during respir el ad
Bian &
(Clear)Lime waterv S125 °?
sis=

(a) It absorbs the carbon dioxide from the incoming atty o
(b) To test for the presenceY of carbon dioxide” @ i

-Set up the apparatus as in the experiment”

-leave out the living organism/rat in flask CY
OR

Just/remove rat onlyYY

(165 + 135 )v = 300V kl”

1000Y - (600 + 300)Y= 100 kJ” (the final answer must have a
unit)

The chickens are warmer inside” v’/ they huddle together, so

chickens maintain a higher body temperature/ there is less activity

inside

TemperatureY

Enzymes denaturedv (lose shape)/ destroyed /damaged and

the active site of enzyme does not fit into substratev /enzyme

becomes functionless

(a) Test tube 3v

(b) The colour/white precipitate obtained after heating shows no
proteins” present indicating that proteins are digestedvY

Predation” /predator-prey relationship

300V

390v (Accept 385 — 395)

1999

Please turn over

(3)

(3)

(2)
(8)

(1)

(2)
(1)
()
(1)
(1)
(1)

(1)
(4)

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EDUCATION
Biology/SG/P1 9 DBE/20TF
SCE - Memorandum j
2013 -06- 95
44 4.41 360\Y =72Y per minute j PRIVATE BAG x11 (2
5 y oe j PRETORIA oco1 i
|_PUBLIC EXAMINATIONS
4.4.2 It causes the pulse rate to increasevv (2
4.4.3 An increased pulse rate indicates:
-an increase in blood flow to the musclesY
-more O2 supplied to the muscles”
-muscles will increase their rate of respiration’
-more COz2 will be produced in the muscle cellsY”
-more CQ, will be removedY (Max 3) (3)
(7)
[25]
QUESTION 5
5.1 5.1.1 To show that oxygen is released” during photosynthesis” (2)
S32 Temperaturev of the water
Number(amount) of air bubbles(gas/oxygen) releasedv’
(Mark first ONE only) (Any 1 x 1) (1)
5.1.3 Bubbles to be captured in a test tube”
Then insert a glowing splint Vv
The splint will burst into flames” indicating the presence of
oxygen (3)
5.1.4 To ensure that the water bath” is kept at a constant
temperature (2)
(8)
5.2 5.2.1 DestarchY (1)
6.2.2 - to prevent the plant from receiving all factors, e.g. light”
which is necessary for photosynthesis.
- without light, no photosynthesis”
- hence, no sugars and starch formedY (3)
5.2.3 Leaf will be prevented from receiving CO2 ~ for photosynthesis/
foil absorbs heat which will damage leaf tissue
Leaf could eventually diev thus the results will be inconclusive (2)
(6)
5.3 5.3.1 (a) Lean beef “and chickenY (2)
(b)  Milkv (1)
(c) Lean beef “and chicken” (2)
(d) Lean beef and chickenY (2)

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Biology/SG/P1 10 if DBEOTS~y
SCE - Memorandum : a |
5.3.2 -Structural component of cell membranes” i ay i328
-all enzymes are proteins” ixigz oS
-hormones are proteinsY 2] 2o dk
SF HD
-component of chromosomes” Sleo 7
-serve as food reserves and energy source’ 2 s = =
-protective function e.g. antibodies” 3 6
-supporting function e.g. keratin” z
a

-transport function e.g. haemoglobin’
-acts as a buffer’

-muscle building(growth) “

- repair and replace worn out/dead tissue”

(Mark first TWO only) (Any2x1) (2)
§.3.3 - seed contains a lot of stored food as sugars/starch”
- contain a lot of cellulosevin cell walls (2)
(11)
[25]

TOTAL SECTION B: 100
GRAND TOTAL: 150

id kegpahe

0 ALLAY
(NTE RNRL g. Preethlall
MopEeeatue 28 Je s 20/3
23/ S} 2013

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