# Life Sciences Grade 12 KZN March Test 2025 Memo

> Grade 12 Life Sciences memorandum from the KZN March Test 2025, 7 pages. Read online or get the free PDF download, question paper linked when available.

- Page: https://www.hlayiso.com/library/life-sciences-grade-12-nsc-memo-march-2025-kzn/0da6b0d9-a319-464a-a903-bef1a7ced149
- Updated: 2026-09-27
- Subject: Life Sciences
- Grade: Grade 12
- Document type: Memorandum
- Year: 2025
- Exam period: KZN March Test
- Curriculum: CAPS
- Pages: 7

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## About this document

Life Sciences · Grade 12 · KZN March Test · 2025. Memorandum, 7 pages. Read online or download the PDF.

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

## Document text

Text extracted from the PDF. Layout, diagrams and tables may not survive extraction.

### Page 1

KWAZULU-NATAL PROVINCE

EDUCATION
REPUBLIC OF SOUTH AFRICA

NATIONAL
SENIOR CERTIFICATE

GRADE 12

; LIFE SCIENCES
COMMON ASSESSMENT TASK

MARCH 2025 TEST

MARKS: 50

This marking guideline consists of 6 pages

### Page 2

Life Sciences Grade 12 Marking guidelines March 2025

2

PRINCIPLES RELATED TO MARKING LIFE SCIENCES MARCH 2025

1.

10.

11.

12.

13.

14.

If more information than marks allocated is given
Stop marking when maximum marks are reached and put a wavy line and ‘max’ in
the right-hand margin.

If, for example, three reasons are required and five are given
Mark the first three irrespective of whether all or some are correct/incorrect.

If whole process is given when only part of it is required
Read all and credit relevant part.

If comparisons are asked for and descriptions are given
Accept if differences / similarities are clear.

If tabulation is required but paragraphs are given
Candidates will lose marks for not tabulating.

If diagrams are given with annotations when descriptions are required
Candidates will lose marks

If flow charts are given instead of descriptions
Candidates will lose marks.

If sequence is muddled and links do not make sense
Where sequence and links are correct, credit. Where sequence and links is
incorrect, do not credit. If sequence and links becomes correct again, resume credit.

Non-recognised abbreviations
Accept if first defined in answer. If not defined, do not credit the unrecognized
abbreviation but credit the rest of answer if correct.

Wrong numbering
If answer fits into the correct sequence of questions but the wrong number is given,
it is acceptable.

If language used changes the intended meaning
Do not accept.

Spelling errors
If recognizable accept provided it does not mean something else in Life Sciences or
if it is out of context.

If common names given in terminology
Accept provided it was accepted at the National memo discussion meeting.

If only letter is asked for and only name is given (and vice versa)
No credit

Copyright reserved Please turn over

### Page 3

Life Sciences Grade 12 Marking guidelines March 2025

15.

16.

Its

18.

3

If units are not given in measurements
Candidates will lose marks. Memorandum will allocate marks for units separately

Be sensitive to the sense of an answer, which may be stated in a different way.

Caption
All illustrations (diagrams, graphs, tables, etc.) must have a caption

Code-switching of official languages (terms and concepts)
A single word or two that appears in any official language other than the learners’
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.

Copyright reserved Please turn over

### Page 4

Life Sciences Grade 12 Marking guidelines
4
SECTION A
QUESTION 1

1.1 BYv

DY
CvvY
DvvY

Gyo eee.
Peacoat ee
Rwryos

1.2 1.2.1 Luteinising hormonev/ LH
1.2.2 Non-disjunctionY”
1.2.3 Cytokinesis~

1.3 1.3.1 AonlyYv
1.3.2 Bonlyvv

1.4.1. (a) Centromerev
(b) Chromatidy

1.4.2 (a) Crossing overY
(b) Metaphase 1”

14.3 1v

SECTION B
QUESTION 2

2.1 2.1.1 (a) tRNAVY
(b) mRNAY
2.1.2 Translation”
2.1.3 GAAY
2.1.4 - Brings specific amino acidsY

- tothe ribosomeY
- For the formation of the required protein’

Copyright reserved

March 2025

(4 x 2)

(3 x 1)

(2 x 2)

TOTAL SECTION A:

Please turn over

(8)

(3)

(4)

(1)
(1)

(1)
(1)

(1)
(5)

20

(1)
(1)
(1)
(1)

(3)

### Page 5

Life Sciences Grade 12 Marking guidelines March 2025
5

2.1.5 - Different protein will be formedY
- since anticodon GGAv/ DNA triplet GGA
- changed to GUAY/ DNA triplet GTA
- and amino acid tyrosineY
- will be replaced by serinev in a protein
OR
- Different / same protein will be formedY
- Since anticodon GGA will changeY
- to anticodon GUAY

- Bringing different / same amino acidY Any (3)
(10)
2.2 2.2.1 Man2v (1)

2.2.2 - Some(three) black bars of Susan’s DNA profile correspond with that
of the motherY
- The remaining (two) black bars of Susan’s DNA profile correspond with

that of Man 2¥ (2)
2.2.3. DNA of each individual is unique, except in the case of identical twinsY (1)
(Mark the first ONE only)

2.2.4 - To identify criminals/ resolve disputes

To identify organisms from their remainsv /dead bodies

To identify family relationships other than paternity e.g. siblings
To diagnose genetic disordersY

- To establish matching tissues” /for tissue typing Any (1)
(Mark the first ONE only) (5)
QUESTION 3
3.1. 3.1.1. Zinc supplementY (1)
3.1.2 50 (healthy) males in each group Y participated in the investigation (1)
(Mark the first ONE only)
3.1.3. - Type of zinc supplementY
- Concentration of zincv/ Volume of zinc Any (1)
(Mark the first ONE only)
3.1.4 - Group B did not receive the zinc supplementY
- If testosterone level increases in group A, it will be due to zinc
supplementv (2)
3.1.5 639.4 -348.4v
= 291V (2)
(7)

Copyright reserved Please turn over

### Page 6

Life Sciences

3:2). 3.231

3.2.2

3.2.3

3.2.4

3.2.5

Grade 12 Marking guidelines March 2025
6

(a) OestrogenY
(b) ProgesteroneY
14v

As the structure C / corpus luteum degeneratesv the level of hormone
B /progesterone decreasesY¥

- There will be no thickening of the endometriumY
- for the implantation / attachment of embryoY

No inhibition of pituitary gland from producing FSHY
(Mark the first ONE only)
TOTAL SECTION B:

GRAND TOTAL:

Copyright reserved

### Page 7

GRADE 12 Alternatives
Q2.1.5

- The codon CCU code for same amino acid/tyrosine as DNA triplet GGAv

- The codon CCU changed to codon CAU which code for same amino acid/serine
as the DNA triplet GTA’

- Therefore, the amino acid serine will replace tyrosinev

- Resulting with the different protein formedv

Q2.2.3
- DNA cannot be alteredv
Q2.2.4
- Tracing of ancestryyY
Q3.1.2
- 100 men divided into two equal groupsY
Q3.1.4

- To verify that zinc supplement is the only cause of increasing the level of
testosterone in group AY

Q3.2.4

- May results in no stimulation of pituitary gland to release more LHY
- resulting ovulation not taking placev

Q3.2.5

- It will result in the endometrium breaking downv/there will be no further
development of the endometrium/endometrium will no longer be maintained.
OR
- FSH level will increasev
- stopping further thickening of endometriumv
- Implantation will not take placev

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