# Life Sciences Grade 12 P2 Eastern Cape Mock 2012 Memo (Eng) > Grade 12 Life Sciences Paper 2 memorandum from the Eastern Cape Mock Exam 2012 (English), 9 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/lfsc-p2-gr12-sep2012-memo-eng/ac05f9f4-7155-425d-b707-6115a3c8df88 - Updated: 2026-09-27 - Subject: Life Sciences - Grade: Grade 12 - Document type: Memorandum - Year: 2012 - Exam period: Eastern Cape Mock Exam - Paper: 2 - Curriculum: CAPS - Pages: 9 Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 12](https://www.hlayiso.com/library/grade-12) › [Life Sciences](https://www.hlayiso.com/library/grade-12/life-sciences) › [Life Sciences Grade 12 P2 Eastern Cape Mock 2012 Memo (Eng)](https://www.hlayiso.com/library/lfsc-p2-gr12-sep2012-memo-eng/ac05f9f4-7155-425d-b707-6115a3c8df88) ## About this document Life Sciences · Grade 12 · Eastern Cape Mock Exam · 2012. Memorandum, 9 pages. 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Layout, diagrams and tables may not survive extraction. ### Page 1 Downloaded from hlayiso.com Province of the EASTERN CAPE EDUCATION NATIONAL SENIOR CERTIFICATE GRADE 12 SEPTEMBER 2012 LIFE SCIENCES P2 MEMORANDUM MARKS: 150 This memorandum consists of 9 pages. ### Page 2 Downloaded from hlayiso.com 2 LIFE SCIENCES P2 (SEPTEMBER 2012) SECTION A QUESTION 1 1.1 1.1.1 A √√ 1.1.2 A √√ 1.1.3 B √√ 1.1.4 C √√ 1.1.5 A √√ 1.1.6 A √√ 1.1.7 C √√ 1.1.8 D √√ 1.1.9 D √√ (9 x 2) (18) 1.2 1.2.1 Endometrium √ 1.2.2 Herbivore √ 1.2.3 Predator √ 1.2.4 Fertilisation √ 1.2.5 Symbiosis √ 1.2.6 Population √ 1.2.7 Census/Counting √ 1.2.8 Decomposers √ 1.2.9 Interspecific competition √ (9 x 1) (9) ### Page 3 Downloaded from hlayiso.com (SEPTEMBER 2012) LIFE SCIENCES P2 3 1.3 1.3.1 Both A and B √√ 1.3.2 Both A and B √√ 1.3.3 A only √√ 1.3.4 None √√ 1.3.5 Both A and B √√ 1.3.6 A only √√ 1.3.7 B only √√ 1.3.8 B only √√ (8 x 2) (16) 1.4 1.4.1 B√ C√ A√ D√ (in this sequence) (4) 1.4.2 D√ (1) 1.4.3 B√ (1) 1.4.4 Primary succession √ (1) TOTAL SECTION A: 50 ### Page 4 Downloaded from hlayiso.com 4 LIFE SCIENCES P2 (SEPTEMBER 2012) SECTION B QUESTION 2 2.1 2.1.1 (a) 3√ (1) (b) 2√ (1) 2.1.2 - Amniotic fluid √ (1) 2.1.3 - Act as a shock absorber √/ protect foetus against injury - Maintain constant body temperature/ - Medium for free movement of foetus. √ - Prevents dehydration of the foetus. √ (Mark first TWO answers only) (2) 2.1.4 Placenta. √ / chorion villi (1) 2.1.5 - Provides nourishment for the embryo √ - Supplies oxygen/ removes carbon dioxide √ - For attaching the embryo to the mother √ - Allow for diffusion of nitrogenous excretory wastes from the foetus to the mother. √ - secretes its own progesterone after ±12 weeks to maintain pregnancy √ (Mark first TWO answers only.) (2) 2.1.6 - umbilical cord √ (1) 2.2 2.2.1 A – Hypophysis / Pituitary gland √ B – Thyroid gland √ C – Pancreas √ (3) 2.2.2 (a) B √ (b) A √ (2) 2.2.3 - The pituitary gland (A) secretes the hormone TSH √ which - stimulates the thyroid gland (B) to secrete thyroxin. √ - an increase in thyroxin in the blood inhibits the pituitary (A) - which secretes less TSH. √ - this cause the thyroid gland to secrete less thyroxin. √ - which in turn reduce the inhibitory effect on the pituitary gland √ - which will then increase the amount of TSH that it secretes. √ (Any 4 x 1) (4) ### Page 5 Downloaded from hlayiso.com (SEPTEMBER 2012) LIFE SCIENCES P2 5 2.3 2.3.1 A – Semi-Circular Canals. √ (1) B – Ampulla √ (1) C – Utriculus √ (1) D – Sacculus √ (1) E – Cochlea √ (1) F – Auditory nerve √ (1) 2.3.2 (a) head movement √/ nodding / speed and direction of head movement (1) (b) changes in the body position √/ gravity (1) (c) sound waves √ (1) 2.3.3 - by the bony labyrinth. √ (1) 2.3.4 (a) cerebellum √ (1) (b) cerebrum √ (1) [30] ### Page 6 Downloaded from hlayiso.com 6 LIFE SCIENCES P2 (SEPTEMBER 2012) QUESTION 3 3.1 3.1.1 This visual courtship display in peacocks is a way that the males attract a mate √ of the same species as a prelude to mating √ (Any 2 x 1) (2) 3.1.2 The embryo within the egg is protected √ from drying out by a shell, √ is nourished by the yolk √ and albumin and is able to develop successfully √ on land. (Any 2 x 1) (2) 3.1.3 Many eggs are eaten by predators √ or washed away √ by the currents and never are fertilised. So thousands off eggs are laid to ensure that some will be fertilised √ and developed into codfish. (Any 2 x 1) (2) 3.1.4 Release of sperm and eggs is synchronised √ which increase the probability that external √ fertilisation of the eggs will occur since the gametes are released in the same places √ at the same time. (Any 2 x 1) (2) 3.1.5 Providing parental care increases the probability √ that the offspring will survive until they are independent √ and fully mature to produce their own offspring. √ (Any 2 x 1) (2) 3.2 3.2.1 The estimated population size of Species A and B over eight weeks 2000 1800 1600 Estimated population size 1400 1200 1000 Species B 800 Species A 600 400 200 0 1 2 3 4 5 6 7 8 Time (weeks) ### Page 7 Downloaded from hlayiso.com (SEPTEMBER 2012) LIFE SCIENCES P2 7 Guideline for the assessing of the graph Correct type of graph and the 1 joining of points Title of graph 1 Correct label and scale x-axes 1 Correct label and scale y-axes 1 Key/ labelling of species A and B 1 Plotting of points 1: 1 to 6 points plotted correctly 2: 7 to 12 points plotted correctly 3: 13 to 15 points plotted correctly 4: all 16 points plotted correctly (9) NOTE: If the wrong type of graph is drawn, 5 marks will be lost for:  ‘Correct type of graph and joining of points’  ‘Plotting of points’ If labels of the axes are transpose then 2 marks will be lost for:  * ‘Correct label and scale for X and Y axes 3.2.2 As the numbers of Species B increases the number of Species A decrease because they (Species A) are the food for Species B √ / In week 1 the numbers of Species A increase more than Species B because they had enough food √/ If Species B would have been the prey, their numbers in week two would have been less because than there would have been more predators (species A) in week 1. √ (Any 1 x 1) (1) 3.2.3 Both would die, √ because the food for Species A would be finished and species A will die leaving Species B without food and they will also die. √ (2) 3.2.4 Species A numbers will increase √ because there will be no predators to kill them. √ (2) 3.3 3.3.1 - The natural resources vary/ - Changing ecosystems - Building of new houses, etc. - Population growth - Increase in waste √ (Any 1 x 1) (1) 3.3.2 - Since 1961 – 1975 the ecological footprint is higher than the biocapacity. √ - After that (1976) the ecological footprint drop below the biocapacity /biocapacity increase above the ecological footprint. √ - During the 1980’s and 1990’s the ecological footprint remained more or less constant. √ - and even dropped slightly in the late 90’s early 2000’s √ (Any 3 x 1) (3) ### Page 8 Downloaded from hlayiso.com 8 LIFE SCIENCES P2 (SEPTEMBER 2012) 3.3.3 - Those countries having higher ecological footprints than their biocapacity will acquire resources from neighbouring countries, √ - thus increasing competition for the resources √/ lead to unrest/war (1) 3.3.4 - 12/13 years √ (1) [30] TOTAL SECTION B: 60 SECTION C QUESTION 4 4.1 4.1.1 Extinct – species that no longer exists √ / last individual of the species have died. Endemic – Organisms which are only found in a restricted area / country / part of a country. √ (2) 4.1.2 - Alien trees were removed from the area. √ (1) 4.1.3 - If endemic species go extinct, they are lost forever √/ as they do not occur anywhere else √ in the world. (Any 1 x 1) (1) 4.2 4.2.1 - James’s hearing is better/not /same/different  than Sandra’s √ - James’s hearing of lower frequencies is higher/lower/the same/different √ than that of Sandra’s √ - Sandra’s hearing of higher frequencies is higher/lower/the same/different √ than that of James. √ (Any 2 x 1) (2) 4.2.2 - James can hear things, √ that Sandra cannot hear. √ (2) 4.2.3 - 19 √ Hz (1) 4.2.4 James. √ He has a range of 19 to 20 300 = 20 281 Hz √ whereas Sandra, has a range of 18 to 20 100 = 20 082 Hz √ (3) 4.2.5 Independent – James and Sandra/person √ Dependent – Lowest and highest frequency √ of sound (2) 4.2.6 No, √ the sound that they(bats) produce have a much higher frequency √ than the range that James can hear. √ (3) 4.2.7 - hammer/maleus, √ anvil/incus √ and stirrup/stapes √ (3) ### Page 9 Downloaded from hlayiso.com (SEPTEMBER 2012) LIFE SCIENCES P2 9 4.3 - When it is hot √ - Heat receptors √ - in the skin √ - and receptors in the hypothalamus √ - are stimulated by the high temperature √ - The stimulus in the skin is converted into an impulse √ - and transmitted to the hypothalamus √ - which acts as the heat regulating centre of the body √ - Impulses are sent from √ the hypothalamus - to the sweat glands √ - and erector muscles √ - More sweat is produced √ - and more heat is lost √ - by evaporation of sweat √ - The erector muscles relax √ - causing the hair √ - to lie flat on the skin √ - trapping very little air between the hair √ - Insulation is thus reduced √ - Dilated blood vessels allow more blood to the skin √ - and more heat is thus lost from the body √ - by radiation/ conduction / convection √ - thus lowering the body temperature to normal √ (Any) (17) ASSESSING THE PRESENTATION OF THE ESSAY Marks Descriptions 3 Well structured – demonstrates insight and understanding of question 2 Minor gaps in the answer 1 Attempted but with significant gaps in the answer 0 Not attempted/nothing written other than question number Synthesis (3) TOTAL SECTION C: 40 GRAND TOTAL: 150 ## Related documents - [Life Sciences P2 Nov 2012 Version 1 Memo Eng](https://www.hlayiso.com/library/life-sciences-p2-nov-2012-version-1-memo-eng/53ca076c-094d-47ab-a446-eeba15e9b01d) — Life Sciences · Memo · 2012 · Eng - [Life Sciences P2 Feb-March 2012 Memo Eng Version 2](https://www.hlayiso.com/library/life-sciences-p2-feb-march-2012-memo-eng-version-2/62f5811f-5098-444d-bb69-1c480216bf8f) — Life Sciences · Memo · 2012 · Eng - [LIFE SCIENCES P2 GR12 MEMO SEPT2022 Afrikaans](https://www.hlayiso.com/library/life-sciences-p2-gr12-memo-sept2022-afrikaans/7cca7322-63ed-4fb0-a67b-5df57d647597) — Life Sciences · Memo · 2022 · Afr - [LIFE SCIENCES P2 MEMO SEPT2021 Sesotho](https://www.hlayiso.com/library/life-sciences-p2-memo-sept2021-sesotho/83f68bb0-0ec1-4a72-a70a-994a6f9af99e) — Life Sciences · Memo · 2021 · Sesotho - [LIFE SCIENCES P2 MEMO SEPT2019 Afrikaans final](https://www.hlayiso.com/library/life-sciences-p2-memo-sept2019-afrikaans-final/88f6122c-22ff-4c15-93fa-fe3e2368921c) — Life Sciences · Memo · 2019 · Afr - [LIFE SCIENCES P2 GR12 MEMO SEPT2015 Afr (final)](https://www.hlayiso.com/library/life-sciences-p2-gr12-memo-sept2015-afr-final/ba98751d-3865-44f0-a283-45a85ee22b81) — Life Sciences · Memo · 2015 · Afr ## More from Grade 12 Life Sciences - [LIFE SCIENCES QP GR12 JUNE 2025 ENG D watermark](https://www.hlayiso.com/library/life-sciences-qp-gr12-june-2025-eng-d-watermark/138939cb-4757-4989-99d7-c9cb21429a5c) — QP · 2025 · Eng - [Life Sciences Grade 12 NSC QP March 2025 KZN](https://www.hlayiso.com/library/life-sciences-grade-12-nsc-qp-march-2025-kzn/b1598f8e-58e0-4c09-b513-b9f61ae73c47) — QP · 2025 - [Life Sciences Grade 12 NSC P2 MEMO September 2025 Mpumalanga](https://www.hlayiso.com/library/life-sciences-grade-12-nsc-p2-memo-september-2025-mpumalanga/17b4cc42-641c-4d7d-9c53-6bac113ce83c) — Memo · 2025 - [Life Sciences Grade 12 NSC P1 QP September 2025 Mpumalanga](https://www.hlayiso.com/library/life-sciences-grade-12-nsc-p1-qp-september-2025-mpumalanga/be917127-6071-4190-b900-3c475d5bfdd4) — QP · 2025 - [Life Sciences Grade 12 NSC P1 QP September 2025 North West](https://www.hlayiso.com/library/life-sciences-grade-12-nsc-p1-qp-september-2025-north-west/9dc29799-a675-40eb-9573-df7341b3572f) — QP · 2025 - [Life Sciences P2 May-June 2025 Afr](https://www.hlayiso.com/library/life-sciences-p2-may-june-2025-afr/f068fe02-7f70-4bf4-91ad-4ead880d1a88) — QP · 2025 · Afr ## Collection - [Grade 12 past papers](https://www.hlayiso.com/grade-12/past-papers) --- Hlayiso: free CAPS and IEB past papers, memos, notes and study guides for South African learners. 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