# Life Sciences Grade 12 P1 Eastern Cape Mock 2022 Memo (Eng) > Grade 12 Life Sciences Paper 1 memorandum from the Eastern Cape Mock Exam 2022 (English), 8 pages. Read online or download the free PDF. - Page: https://www.hlayiso.com/library/life-sciences-p1-gr12-memo-sept2022-english/754ad21d-19f9-4b20-965d-0f081e6063ef - Updated: 2026-09-27 - Subject: Life Sciences - Grade: Grade 12 - Language: English - Document type: Memorandum - Year: 2022 - Exam period: Eastern Cape Mock Exam - Paper: 1 - Curriculum: CAPS - Pages: 8 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 P1 Eastern Cape Mock 2022 Memo (Eng)](https://www.hlayiso.com/library/life-sciences-p1-gr12-memo-sept2022-english/754ad21d-19f9-4b20-965d-0f081e6063ef) ## About this document Life Sciences · Grade 12 · Eastern Cape Mock Exam · 2022 · English. Memorandum, 8 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 Downloaded from hlayiso.com NATIONAL SENIOR CERTIFICATE SENIOR SERTIFIKAAT GRADE 12 SEPTEMBER 2022 LIFE SCIENCES P1 MARKING GUIDELINE MARKS: 150 This marking guideline consists of 8 pages. ### Page 2 Downloaded from hlayiso.com 2 LIFE SCIENCES P1 (EC/SEPTEMBER 2022) PRINCIPLES RELATED TO MARKING LIFE SCIENCES 1. 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. 2. If, for example, three reasons are required and five are given Mark the first three irrespective of whether all or some are correct/incorrect. 3. If whole process is given when only a part of it is required Read all and credit the relevant part. 4. If comparisons are asked for, but descriptions are given Accept if the differences/similarities are clear. 5. If tabulation is required, but paragraphs are given Candidates will lose marks for not tabulating. 6. If 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-recognised abbreviations Accept if first defined in answer. If not defined, do not credit the unrecognised abbreviation, but credit the rest of the 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. Spelling errors If recognisable, accept the answer, provided it does not mean something else in Life Sciences or if it is out of context. 13. If common names are given in terminology Accept, provided it was accepted at the national memo discussion meeting. 14. If only the letter is asked for, but only the name is given (and vice versa) Do not credit. Copyright reserved Please turn over ### Page 3 Downloaded from hlayiso.com (EC/SEPTEMBER 2022) LIFE SCIENCES P1 3 15. If units are not given in measurements 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 appear(s) 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. Copyright reserved Please turn over ### Page 4 Downloaded from hlayiso.com 4 LIFE SCIENCES P1 (EC/SEPTEMBER 2022) SECTION A QUESTION 1 1.1 1.1.1 A ✓✓ 1.1.2 A ✓✓ 1.1.3 B ✓✓ 1.1.4 D ✓✓ 1.1.5 D ✓✓ 1.1.6 C ✓✓ 1.1.7 D ✓✓ 1.1.8 A ✓✓ 1.1.9 A ✓✓ 1.1.10 C ✓✓ (10 x 2) (20) 1.2 1.2.1 Prolactin ✓ 1.2.2 Mitosis ✓ 1.2.3 Reflex arc ✓ 1.2.4 Autonomic ✓nervous system 1.2.5 Synapse ✓ 1.2.6 Cranium ✓ 1.2.7 Gestation ✓ 1.2.8 Thyroid stimulating hormone ✓/ TSH 1.2.9 Osmoregulation ✓ 1.2.10 Corpus callosum ✓ (10 x 1) (10) 1.3 1.3.1 A only ✓✓ 1.3.2 None ✓✓ 1.3.3 A only ✓✓ (3 x 2) (6) 1.4 1.4.1 (a) Hypothalamus ✓ (1) (b) Pituitary ✓gland (1) (c) ADH ✓/ Antidiuretic hormone (1) (d) Renal tubules ✓ /collecting tubule/distal convoluted tubule (1) 1.4.2 Becomes more permeable to water ✓ (1) 1.4.3 Sweating ✓/ breathing (Any ONE) (Mark first ONE only) (1) 1.5 1.5.1 (a) Motor neuron ✓ (1) (b) Sensory neuron ✓ (1) 1.5.2 Cell body ✓ (1) 1.5.3 (a) A ✓ Myelin sheath ✓ (2) (b) C ✓ Dendrites ✓ (2) 1.5.4 II ✓ (1) TOTAL SECTION A: 50 Copyright reserved Please turn over ### Page 5 Downloaded from hlayiso.com (EC/SEPTEMBER 2022) LIFE SCIENCES P1 5 SECTION B QUESTION 2 2.1 2.1.1 T✓ DIAGRAM I DIAGRAM II Has one cervix ✓ Has two cervixes ✓ Has one uterus ✓ Has two uteruses/uteri ✓ (Mark the first TWO only) (Any 2 x 2 + 1) (5) 2.1.2 - Ectopic pregnancy ✓ - Intra-uterine foetal growth restriction ✓ - Abnormal placentation ✓ - Foetal malposition ✓ (Any 2 x 1) (2) (Mark first TWO only) 2.1.3 - The high levels of progesterone ✓ - inhibit the pituitary gland ✓ - from releasing the FSH ✓ - Therefore, no new follicle will develop ✓ - and no ovum will be released ✓/ ovulation takes place - for another fertilisation to occur ✓ (Any 4 x 1) (4) 2.2 - The embryo develops an outer membrane, the chorion ✓ - and an inner membrane, the amnion ✓ - The amnion forms a cavity ✓ - which encloses the amniotic fluid ✓ - The chorionic villi ✓that develops from the chorion - together with the endometrium ✓ - forms the placenta ✓ - A hollow tube called the umbilical cord ✓ attaches - the embryo to the placenta ✓ - The umbilical cord consists of an umbilical artery ✓ - and an umbilical vein ✓ (Any 8 x 1) (8) 2.3 2.3.1 Blood vessels ✓ (1) 2.3.2 - Blood vessels/ part A constricts ✓/vasoconstriction occurs - causing less blood flow to the surface of the skin ✓ - therefore, less heat is lost ✓ to the environment (3) 2.3.3 - There will be a reduced/no supply of oxygen ✓ and - glucose to the skin cells ✓ - resulting in lower/no metabolism ✓/cellular respiration/less heat energy (3) 2.3.4 - Secretion of less/no sweat causes less evaporation ✓/less cooling - which leads to an increase in body temperature ✓/overheating - This will result in the denaturing of the enzymes ✓ - which will cause metabolic processes to stop ✓ (4) Copyright reserved Please turn over ### Page 6 Downloaded from hlayiso.com 6 LIFE SCIENCES P1 (EC/SEPTEMBER 2022) 2.4 2.4.1 - Eyes are closed ✓/ blind - No feathers ✓ - Cannot move ✓ (Any 2 x 1) (Mark first TWO only) (2) 2.4.2 - Not accessible to many predators ✓ - since they cannot run from them ✓ - Therefore, increasing the chances of survival ✓ (3) 2.4.3 - The yolk volume in precocial birds will be more ✓ than in altricial - because it needs more nutrients ✓ - to be born fully developed ✓ (3) 2.5 2.5.1 (a) Zinc supplement ✓ (1) (b) Testosterone levels in the blood ✓ (1) 2.5.2 - Testosterone levels in the blood were measured ✓ - before the administering of the zinc supplement ✓ (2) 2.5.3 - Type of zinc product ✓ - Concentration of zinc ✓ - Volume of zinc ✓ - Way of administering the zinc ✓ - Time of administering the zinc supplement ✓ (Any 2 x 1) (2) (Mark first TWO only) 2.5.4 - 60 males were used ✓ - Investigation was done over a period of 12 weeks ✓/ 6 weeks (Any 2 x 1) (2) (Mark first TWO only) 2.5.5 Zinc supplements increase the testosterone levels in the blood✓✓ (2) 2.5.6 - Stimulates the production of sperm cells ✓ - Stimulates puberty ✓ (Mark first TWO only) (2) [50] Copyright reserved Please turn over ### Page 7 Downloaded from hlayiso.com (EC/SEPTEMBER 2022) LIFE SCIENCES P1 7 QUESTION 3 3.1 3.1.1 Cochlea (1) 3.1.2 Transmits impulses to the brain ✓ (1) (Mark first ONE only) 3.1.3 To prevent echo ✓ (1) 3.1.4 - Sudden changes in the speed and direction of head movement ✓ - stimulates the cristae ✓ - in the semi-circular canals ✓ - A change in the position of the head ✓ - stimulates the maculae ✓ - in the utriculus and sacculus ✓ - to send the impulse ✓ - via the auditory nerve ✓ - to be interpreted in the cerebellum ✓ - Cerebellum sends impulses to skeletal muscles ✓ to restore balance (Any 7 x 1) (7) 3.1.5 - No vibrations will occur ✓ - and no pressure waves will be created in the inner ear ✓ - Organ of Corti/hair cells will not be stimulated ✓ - Therefore, no impulses will be sent to the cerebrum ✓ (4) 3.2 3.2.1 To expose leaves to light for photosynthesis ✓ (1) (Mark first ONE only) 3.2.2 Geotropism ✓/ gravitropism (1) 3.2.3 To eliminate the effect of gravity ✓/ expose the stem to gravity on all sides (1) 3.2.4 - Auxins will move to the lower side of the growing tip ✓ - There will be a high concentration of auxin in the lower side ✓ stem - which will stimulate cell elongation ✓/ growth - Therefore, the lower side will grow faster ✓ - This will cause the stem to bend upwards ✓ (5) 3.2.5 - The auxin ✓ - produced at the tip of the stem ✓ will be removed - Therefore, stem will not grow ✓ - Lateral branches will develop ✓ - in the absence of apical dominance ✓ (Any 4 x 1) (4) 3.2.6 Gibberellins ✓ (1) Copyright reserved Please turn over ### Page 8 Downloaded from hlayiso.com 8 LIFE SCIENCES P1 (EC/SEPTEMBER 2022) 3.3 3.3.1 Cornea ✓ (1) 3.3.2 - The circular muscles relax ✓ - While the radial muscles contract ✓ - to cause the pupil to dilate ✓ (Any 2 x 1) (2) 3.3.3 - Muscles in Part A / ciliary muscles will contract ✓ - Causing the suspensory ligaments to slacken ✓ - Resulting in the lens becoming more rounded ✓/convex (3) 3.3.4 (a) C✓ (1) (b) - If the drainage channels are fully blocked ✓ - the excess fluid accumulates in the eye ✓ (2) (c) - When the photoreceptors are damaged the stimuli cannot be converted to nerve impulses ✓ - The damage to optic nerve prevents the transmission nerve impulses ✓ - to the cerebrum for interpretation ✓ (3) 3.4 3.4.1 (a) Kidney ✓ (1) (b) Aldosterone ✓ (1) 3.4.2 (a) - Salt levels in the blood decreases ✓ - Because less/ no aldosterone is secreted ✓ - Therefore, renal tubules are less permeable ✓ - Less salt is reabsorbed into blood ✓ - since salt levels are above normal in blood ✓ (5) (b) - There will be less salt in the urine ✓ - Because renal tubules are more permeable to salt ✓ - More salt is reabsorbed into blood ✓ - Since salt levels were below normal in the blood ✓ (4) [50] TOTAL SECTION B: 100 GRAND TOTAL: 150 Copyright reserved Please turn over ## Related documents - [LIFE SCIENCES P2 GR12 QP SEPT2022 English Final](https://www.hlayiso.com/library/life-sciences-p2-gr12-qp-sept2022-english-final/48fd8634-2e51-4ca1-b7e3-df271e86c9ec) — Life Sciences · QP · 2022 · Eng - [LIFE SCIENCES P1 QP GR12 SEPT2021 English](https://www.hlayiso.com/library/life-sciences-p1-qp-gr12-sept2021-english/51bdf0cb-548d-43fc-b083-c4f0f664b370) — Life Sciences · QP · 2021 · Eng - [LIFE SCIENCES P1 QP SEPT2019 English final](https://www.hlayiso.com/library/life-sciences-p1-qp-sept2019-english-final/0aee37ba-cb6c-4703-8a28-3bd5d8231c5d) — Life Sciences · QP · 2019 · Eng - 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