Life Sciences Grade 12 Paper 1 Limpopo Mock 2022 Memo

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com _ CUCK HERE PROVINCIAL GOVERNMENT REPUBLIC OF SOUTH AFRICA DEPARTMENT OF ; | EDUCATION _— a * NATIONAL SENIOR CERTIFICATE | [ GRADE 12 4 a LIFE SCIENCES — PAPER 1 ; " SEPTEMBER 2022 . MARKS: 150. DURATION: 22 HOURS II This question paper consists of 17 pages Copyright reserved Please turn over

Life Science: Downloaded from hlayiso, Cort ember 200 Downloaded from Stanmorephysics.com INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. 2. 3. 8. 9. Answer ALL the questions. Write ALL the answers in the ANSWER BOOK. Start the answers to each question at the top of a NEW page. Number the answers correctly according to the numbering system used in this question paper. Present your answers according to the instructions of each quest Do ALL drawings in pencil and label them in blue or black ink Draw diagrams, flow charts or tables only when askedto, lo SO. The diagrams in this question paper are NOT ren drawn to scale. Do NOT use graph paper. - (© 10. You must use a non-programmable caléilator, protractor and compass, where necessary. & PA 11.Write neatly and legibly. & Copyright reserved Please turn over

Life Sciences P1 Downloaded from hlayiso.com LithpopoDoE/September 2022 Downloaded from Stanmorepftysics.com 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 to D) next to the question number (1.1.1 to 1.1.10) in the ANSWER BOOK, e.g. 1.1.11 D. 1.1.1. Ifa cell from the human body has 23 chromosomes, it is... A. a zygote B. diploid C. a gamete D. a somatic cell & 1.1.2 Which part of the brain interprets impulses from the retina of the eye? A. medulla oblongata . ° B. cerebrum AG) C. cerebellum \? D. corpus callosum A. Receives and interprets sensory information B. The centre for control of breathi C. The maintenance of equilibriu! balance D. The centre for regulation Ki y temperature 1.1.3. Which ONE of the following is the nga cerebellum? increases, the... A. lens becomes 4 nvex B. eye is focuss' r distant vision C. pupil dilate D. lens bi 1.1.5 In hui ertilisation takes place in the... A. ‘loptan tubes B ina uterus ave. ovary 1.1.6 When a person drinks 340ml of water more than the daily quantity, then approximately 340ml more urine should be excreted. If an amount of salt is ingested with water, less urine will be produced. The reason is that: A. Salt water is absorbed by the tissues B. The renal tubules will reabsorb less water C. The renal tubules will reabsorb more water D. Less aldosterone will be secreted 1.1.4 When the tension of the alien ligaments in the human eye Please turn over Copyright reserved

Life Sciences P1 Downloaded from hlayiso.com. ssa. Downloaded from Stanmore}fysics.com poDol 1.1.7 The list below shows the stages involved in the negative feedback mechanism: (i). Effectors bring about corrective responses (ii). A receptor detects a change in the internal environment (iii). Factor brought back to normal (iv). Hormonal messages are sent to the effectors Which of the following shows the correct order in which these stages occur? A. (ii), (iv), (iii), (i) B. (iv), (ii), (ii), (i) C. (ii), (iv), (i), (iii) D. (iv), (ii), (i), (iii) 1.1.8 The hormone responsible for the development of female secondary sexual characteristics is...? A. testosterone B. progesterone C. oestrogen D. FSH 1.1.9 Which ONE of the following occurs as a result of the regular cutting of the apical buds of a tree? A. The tree grows shorter B. The tree grow towards the source of light C. The tree remains the same size D. The tree produces more lateral buds 1.1.10 Which ONE of the following structures plays a role in cooling the human body? A. Blood capillaries in the skin B. Medulla oblongata C. Renal tubules r c D. Mammary glands (10x2) (20) Copyright reserved Please turn over

Life Sciences P Downloaded from hlayiso. com popoDoE/September 2022 Downloaded from Stanmorephysics. com 1.2 Lad 1.2.2 1.2.3 1.2.4 125 1.2.6 Lat 1.2.8 1.2.9 1.2.10 The process whereby diploid cells in the testes give rise to sperm cells 1.3 Give the correct biological term for each of the following description Write only the term next to the question numbers (1.2.1 to 1.2.10) in the ANSWER BOOK. The unpaired gland in the male reproductive system that secretes an alkaline fluid Membranes that surround and protect the brain and spinal cord The hormone that prepares the body for an emergency by increasing the heart rate and the breathing rate The structure in the sperm cell that contains enzymes to digest the outer layer of the ovum The structure in the ear that absorbs excess vibrations to prevent echoes An embryo consisting of a hollow ball of cells Specialised cells that receive the stimulus of light and convert it to an impulse The ability to see with both eyes where each eye produces a slightly different image of the same object and allows one to judge distance The breaking of the inner lining of the uterus that is aESOKOpanle by bleeding (10 x 1) (10) Indicate whether each of the statements in COLUMN | applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write A only, B only, Both A and B or None next to the question number (1.3.1 to 1.3.3) in the ANSWER BOOK. [_ COLUMN | COLUNN II 1.3.1 Secreted by the corpus A. Oestrogen luteum B. Progesterone 1.3.2. A brain disorder that A. Alzheimer's disease causes memory loss B. Astigmatism 1.3.3 Causes the conversion of glucose to glycogen A. TSH B. Aldosterone Copyright reserved (3x2) (6) Please turn over

Downloaded from hlayiso.com a Life Sciences P1 6 . ay'So.com. 2022 Downloaded from Stanmoreptftysics.com 1.4. The diagram below represents a reflex arc wy, 4.4.1. Give the LETTER and the NAME of the part that: (a) Transmits impulses to the central nervous system (2) (b) Is probably damaged if a person is able to detect the stimulus, but cannot respond. (2 (c) Responds to the original stimulus (2) 4.4.2 State if the nerve impulse travels from A to G or from G to A (1) (7) Copyright reserved Please turn over

Downloaded from hlayiso. com Life Sciences P1 Downloaded from Stanmorephysics. com 1.5 The diagram below shows some structures in the human body 1.5.1 Identify part: (a) A (b) E 1.5.2 Give the LETTER and NAME of the structure that: (a) Controls the secretions of other endocrine glands (b) Secretes a hormone that regulates metabolic rate 1.5.3 Name the condition where gland labelled C enlarges due to a deficiency in iodine TOTAL SECTION A: LimpopoDoE/September 2022 (1) (1) (2) (2) (1) (7) 50 Please turn over Copyright reserved

Downloaded from hlayiso.com Life Sciences P1 . LimpopoDoE/September 2022 Downloaded from Stanmorepbysics.com SECTION B QUESTION 2 2.1. The diagram below represents the developing foetus in the female's body. 2.1.1 Identify the parts labelled: (a) D (1) (b) E (1) 2.1.2 Name TWO substances present in high concentrations in the artery found in structure D. (2) 2.1.3 State THREE functions of the fluid labelled A. (3) 2.1.4 Explain how the part labelled B is structurally suited to perform its function during the process of birth. (2) 2.1.5 Name TWO systems in the baby’s body that take over the functions of C once the baby is born (2) (11) Copyright reserved Please turn over

“lectus pO OWNIoaded from hlayiso.com Downloaded from Stanmorephysics.com”” Aee 2.2 Explain the consequence on human reproduction if a male wears tight-fitting underwear all the time (3) —" , ales use an ovulation monitor so that they can be aware of e days when they are fertile. These monitors measure the level of prepiise) s in the blood (a) Why would females want to know when they are fertile? (1) (b) Explain which hormone is likely to be monitored by the ovulation monitor (3) (4) 2.4 Grade 12 learners investigated the effects of two plant growth substances, Gibberellins and Auxins on apical dominance. The apical buds of nine pea plants of the same species, age and height were removed. These plants were then divided into three groups. In each group the cut surface of the remaining shoot (growing stem) of the pea plants was treated in one of the following ways: Group 1: Coated with a paste containing gibberellins of the same concentration Group 2: Coated with a paste containing auxins of the same concentration Group 3: Coated with a paste only (containing no plant growth hormones) The hormones diffuse into the plant until no more hormones remain in the paste The treated plants were all grown under the same conditions in the laboratory. The length of the lateral branches of each plant was measured after every two days for a period of 12 days. Measurements were taken at the same time for all treated plants and the average for each group was calculated Copyright reserved Please turn over

Downloaded from hlayiso.com H6iinloaded from Stanmorepaysics.com” pcre. The results of the investigation are shown in the graph below Average length of lateral branches for three groups over time 160 _ = 140 —— cE 120 - $3 100 ss gos ¢ —-— Auxins 25 60 WA a2 —— Gibberellins £5 40 a ~~~ Paste only = 20 far > ee ae ae ee 0+ T T T T : : 0 2 4 6 8 10 12 Days after treatment 2.4.1 State ONE function of the gibberellins that led to the results obtained in this investigation. (1) 2.4.2 Calculate the difference in the average length of the lateral branches between the plants treated with gibberellins and the plants treated with the paste only on the 8" day after the treatment. Show ALL working. (3) 2.4.3 State TWO ways in which the reliability of the results could be increased. (2) 2.4.4 State TWO factors that should have been kept constant in all the groups. (2) 2.4.5 Use the results to explain the effect of auxins on the growth of lateral branches. (4) (12) ight reserved Copyrigh Please turn over

Downloaded from hlayiso. com Life Sciences P1 popoDoE/September 2022 Downloaded from Stanmorephysics. com 2.5 Read the following extract on multiple sclerosis Multiple sclerosis is a disorder that causes inflammation of nervous tissue in any area | of the central nervous system (CNS) and affects about 1 in 1600 people in South Africa. The first signs of multiple sclerosis are vision problems, weakness or fatigue, pains and spasms, cognitive problems and problems with bladder control. It is thought that multiple sclerosis is caused by a combination of factors, such as viruses, heredity, the environment and auto-immunity. Auto-immunity is when the body attacks its own nervous tissue. In the case of multiple sclerosis, the myelin sheath of the axons break up and there is inflammation of white matter in the CNS. Drugs are used to treat people with multiple sclerosis, but there is no cure. ————_— — 2.5.1. Name the structures that make up the CNS (2) 2.5.2 State TWO functions of the myelin sheath (2) 2.5.3 Give TWO possible causes of multiple sclerosis (2) 2.5.4 From the extract, name TWO symptoms of multiple sclerosis (2) (8) 26 Describe the structure and functioning of the autonomic nervous system (4) ver Copyright reserved Please turn o

___ Downloaded from hlayiso.com DiWAaed from Stanmorephysics.con ae 2.7 The diagram below show different reproductive strategies in animals. Diagram 1 2.7.1 Identify the developmental strategy shown in: (a) Diagram 1 (1) (b) Diagram 2 (1) 2.7.2 State TWO characteristics of the young, born of organisms to your answer in QUESTION 2.7.1(b) (2) 2.7.3. Explain the advantage of ovovivipary over ovipary as a reproductive strategy (4) (8) TOTAL QUESTION: [50] Copyright reserved Please turn over

Downloaded from hlayiso.com Life Scjences,P1 3. ui DoE/September 2022 Downloaded from Stanmorepkysics.com eae QUESTION 3 3.1. The diagram below represents the structure of the human eye. c B { ¥ D | a _ _p— — eee F E 3.1.1. Give the LETTER of the part which: ~ (a) Supplies nutrients and oxygen to the eye (1) 4 (b) | Transmits impulses to the cerebrum (1) 3.1.2 Name the visual defect that is shown in the diagram (1) 3.1.3. State TWO causes of the defect mentioned in QUESTION 3.1.2 (2) 3.1.4 Explain why when looking at a flower directly in front of you, the flower appears clear, but the trees in the distance appear blurred (4) (9) Copyright reserved Please turn over

Downloaded from hlayiso.com Life nces P1 . LimpopoDoE/September 2022 Downloaded from Stanmoreghysics.com 3.2 Dale took part in an experiment on the eye's response to light. A lamp was placed at six different positions from Dale's face. The diameter of Dale's pupil was measured at each position. The results are shown in the table below. Position of the lamp Diameter of the pupil (mm) A 2,2 2,8 3,4 4,0 46 5,2 nm) m| Oo} O| @ 3.2.1 (a) At which position was the lamp furthest away fromthe eye? = (1) (b) Explain your answer to Question 3.2.1 (a). (2) 3.2.2 When the lamp was moved from position E to position F, describe the process that caused the change in the diameter of the pupil (4) (7) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences P1 1 . popoDoE/September 2022 Downloaded from Stanmorephysics.com 3.3. An investigation was conducted to determine the change in the diameter of a healthy follicle in the human ovary over the different days of the menstrual cycle. A sample of 100 women aged between 25 and 30, with regular menstrual cycles, was used for this investigation. rage follicle diameters of all 100 women during their menstrual cycles easured and recorded The following results were obtained from this investigation. "DAYS WHEN FOLLICLES WERE _ | AVERAGE DIAMETERS OF THE MEASURED FOLLICLES (mm) | 5 69 10 13,3 f 13 18,8 — 14 22,0 |— 20 3,4 - 25 2.6 Lu = 3.3.1 For the investigation, state the: (a) Dependent variable (1) (b) Independent variable (1) 3.3.2 Name THREE planning steps that had to be considered before carrying out the investigation (3) 3.3.3 Explain the changes in the follicle diameters from day 14 to day 25 (3) 3.3.4. Explain how the results would probably differ if all the women used contraceptive pills that contained a high level of progesterone (3) (11) Copyright reserved Please turn over

Downloaded from hlayiso.com sans Downleaiied from Stanmoreph{ysics. cohrerent Sores 3.4 Study the diagram of the human ear 3.4.1 Identify structures: os (1) nl (1) 3.4.2 Explain how structures B and C contribute to the amplification of sound (2) 3.4.3 Describe how structure E restores balance when the position of the head changes (5) (9) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sci Downloade d fi 1 . LitnpopoDoE/September 2022 oade rom Stanmorep ‘sics.com 3.5 The flow diagram below shows the homeostatic control of blood glucose Glucose level Too HIGH Too LOW Detection by an endocrine gland Hormone A Hormone B Response Response 3.5.1. What is an endocrine gland? (2) 3.5.2 Identify: (a) Hormone A (1) (b) Hormone B (1) 3.5.3 Name the gland that secretes the hormones mentioned in QUESTION 3.5.2 (1) xplain the consequences for a person if the gland entioned in question 3.5.3 fails to secrete hormone A (4) (9) 5e osmoregulation in humans when a person has not had water to drink (5) TOTAL QUESTION 3: [50] TOTAL SECTION B: 100 GRAND TOTAL: 150 Copyright reserved

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com LIMPOPO PROVINCIAL GOVERNMENT REPUBLIC OF SOUTH AFRICA DEPARTMENT OF EDUCATION MARKS: 150 This MARKING GUIDELINES consists of 11 pages Copyright reserved Please turn over

Downloaded from hlayiso.com Grewaknaster, From Stanmorephysics. contimpopo DOE/Prep 2022 10. 11. 12. 13. NSC PRINCIPLES RELATED TO MARKING LIFE SCIENCES If more information than marks allocated is given Stop marking when maximum marks is 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 are incorrect, do not credit. If sequence and links becomes correct again, resume credit. 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. 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. Copyright reserved Please turn over

Downloaded from hlayiso.com Greiwaknaster, From Stanmoreghysics. contimpopo DOE/Prep 2022 14, 15. 16. 17. 18. NSC If only letter is asked for and only name is given (and vice versa) No credit. If units are not given in measurements Memorandum will allocate marks for units separately, except where it is already given in the question. Be sensitive to the sense of an answer, which may be stated in a different way. Caption Credit will be given for captions to all illustrations (diagrams, graphs, tables, etc.) except where it is already given in the question. 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

Downloaded from hlayiso.com Grewatnaster, From Stanmoreghysics. contimpopo DOE/Prep 2022 SECTION A QUESTION 1 1.1 1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7 1.1.8 1.1.9 1.1.10 1.2 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 1.2.10 Copyright reserved NSC Cvv BYY cvv BYY AVY cvv cvv cvv Dvv AVY (10 x 2) Prostate glandv Meningesv” Adrenalin’ Acrosomev Round windowv /fenestra rotunda Blastulay /Blastocyst Photoreceptorsv Stereoscopicy vision/binocular Menstruation’ (20) Spermatogenesisv (10x 1) (10) Please turn over

Downloaded from hlayiso.com Greiwaknaster] From Stanmorephysics. contimpopo DOE/Prep 2022 NSC 1.3 1.3.1 B onlyvv 1.3.2 A only vv 1.3.3 Noney ¥ (3 x 2) (6) 1.4 1.4.1 (a) BY —Sensory neurony (2) (b) |= FY —Motor neurony (2) (C)> 9—eGv — Effector v/ muscle (2) 1.4.2 AtoGv (1) (7) 15 reph 1.5.1 (a) Hypothalamus” (1) (b) Adrenal glandv (1) 1.5.2 (a) BY — Pituitary glandY/Hypophysis (2) (b) Cv- Thyroid glandY (2) 1.5.3 Goitre v (1) (7) TOTAL QUESTION 1: [50] TOTAL SECTION A: 50 Copyright reserved Please turn over

Downloaded from hlayiso.com Grewatnaster, From Stanmoreghysics. contimpopo DOE/Prep 2022 NSC SECTION B QUESTION 2 2.1 2.1.1 (a) Umbilical cordv (1) (b) | Endometriumy/uterus wall (1) - Carbon dioxide” - Nitrogenous wastesv/ examples (2) - It allows free movement of the foetus” - It acts as a shock absorber”/prevents mechanical injury to the foetus - It protects the foetus against dehydration’ It protects the foetus against temperature changesY (Mark first TWO only) Any (3) 2.1.4 - Uterine walls are made up of musclesY which contract and relax to push foetusv /afterbirth forward (1 x 2) (2) 2.1.5 - Respiratory” /Gaseous exchange system - Digestive system - ExcretoryY system (Mark first TWO only) Any (2) (11) 2.2 - Fertility is reducedv - because the temperature is always highY - This will lead to production of abnormal sperms/no sperms/fewer sperms” (3) 2.3 (a) for family planning’’/to know when they can get pregnant (1) (b) LH V/FSH/Oestrogen - There is a rise in levelsY of LH/FSH/Oestrogen - around the time of ovulation’ (3) (4) (18) Copyright reserved Please turn over

Downloaded from hlayiso.com Greiwalnaster] From Stanmorephysics. contimpopo DOE/Prep 2022 NSC 2.4 2.4.1 - Gibberellins stimulates cell elongationy/cell enlargement/ elongation of internodes/cell growth (1) 2.4.2 (120-80) v mm = 40V mmv (3) 2.4.3 - Increase the number of plants used in each treatment” - Repeat the investigation” - Increase the period of the investigation’ (Mark first TWO only) Any (2) 24.4 - Same species of pea plantsY - Same agev - Same height” - Same environmental conditions” - Same number of pea plants” (Mark first TWO only) Any (2) 2.4.5 Auxins diffused from the paste into the plants” Inhibiting growth of the lateral branchesY Once all the auxins were used up” from the paste The growth of the lateral branches increasedY (4) (12) 2.5 2.5.1 Brainy and spinal cordv (2) 2.5.2 - (Electrical) insulation’ - Speed up the transmission of impulses” (2) 2.5.3 Virusesv Heredity” Environment’ Auto-immunityY Any (2) 2.5.4 Vision problemsY Weakness¥ /fatigue PainsY SpasmsY Cognitive problemsY Problems with bladder control” Any (2) (8) 2.6 - Every organ and gland is controlled by two sets of nervesv /double innervations - that act antagonistically/oppose each other” - to control involuntary actions~/brings about homeostasis - Sympatheticy nerves - stimulates a responsev/example - Parasympatheticv nerves - inhibits a responsev/example Any (4) Copyright reserved Please turn over

Downloaded from hlayiso.com Grewalnaster] From Stanmoreghysics. contimpopo DOE/Prep 2022 2.7 2.7.1 2.7.2 NSC (a) Altricialv development (1) (b) Precocialv development (1) - Eyes are open when they are born’ - Their bodies are covered with fur ~ - They are able to move about soon” after birth - They are able to feed themselvesY =They are independent of their parents” Any (2) 2.7.3 The Chances of producing offsprings are greater” in ovovivipary Copyright reserved ) since the eggs are protectedy within the mother the young ones are better developed to cope in the environmentY In ovipary many eggs laid may be eaten by predators” the young are not well developed v and therefore have a smaller chance of survivalY Any (2 x 2) (4) (8) TOTAL QUESTION 2: 50 Please turn over

Downloaded from hlayiso.com Greiwaknaster] From Stanmorephysics. contimpopo DOE/Prep 2022 QUESTION 3 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.2 3.2.1 3.2.2 3.3 3.3.1 3.3.2 Copyright reserved NSC (a) CY (1) (b) Ev (1) Long sightedness” /hypermetropia/hyperopia (1) The eyeball being too roundedv the inability of the lens of the eye to become more convexY = (2) - The eyes are focused on the flower” - The lens of the eye adjusts its convexity” to accommodate - the distance between the flower and the lensY” - The trees are at a different distance from the lensv - The lens cannot adjust its convexity to accommodate two different distances at the same time” Any (4) (9) (a) Fv (1) (b) - Diameter of the pupil is the largestv - indicating dim light conditions” (2) -*Pupillary mechanismv - Radial muscles of the iris contractv - Circular muscles relax” - The pupil dilatesv /becomes wider/bigger * 1 COMPULSORY MARK (4) (7) (a) Diameters of the follicles~ (1) (b) Days Yof the menstrual cycle (1) - Seek permission from participants” - Decide on the sample sizev - Decide on the equipment for measuring” - Decide on the age- group of participants” - Decide on using women with regular menstrual cycles” - Decide on the recording tool”/instrument/method - Decide on the duration’ - Learning how to use the equipment Any (3) Please turn over

Downloaded from hlayiso.com Grewatnasted: From Stanmorephysics. contimpopo DOE/Prep 2022 3.3.3 3.3.4 3.4 3.4.1 3.4.2 3.4.3 3.5 3.5.1 3.5.2 3.5.3 3.5.4 Copyright reserved NSC - The follicles decrease in sizev - as ovulation has taken placev - The resulting corpus luteum becomes smalier~ - because fertilisation did not take placeY Any (3) - The production of FSHY - will be inhibited” - which will stop/inhibit the development/growth of a folliclew - therefore the follicle will remain the samev Any (3) (11) (a) OssiclesY (1) (b) | CochleaY (1) Structure C (tympanic membrane) has a larger surface area than BY v (oval window) (2) - Maculae” are stimulated - by changes in the position of the headv - and convert the stimulus to nerve impulses” - The impulses are transmitted by the vestibular/auditory nerveY - to the cerebellum” to be interpreted - The cerebellum sends impulses via motor neuron” to skeletal musclesv to restore balance Any (5) (9) - Gland that secretes hormones” - directly into the blood ” (2) (a) Insulin vv (1) (b) GlucagonY (1) Pancreasv (1) - There will be no conversion of glucose into glycogen” - in the liver”/muscles - no absorption of glucose by the cells” - the blood glucose levels will remain highY - and may lead to diabetes mellitusW Any (4) (9) Please turn over

Downloaded from hlayiso.com Grewatnaster, From Stanmorephysics. contimpopo DOE/Prep 2022 NSC 3.6 - The receptor cells in the hypothalamus are stimulated” - the hypothalamus sends impulses to the pituitary glandv - which secretes ADHY - ADH causes the permeability of renal tubules to increaseY - this causes the renal tubules to reabsorb more waterY to theysurrounding blood vessels~ - the blood becomes more dilutev ~aismaller volume of concentrated urine is excreted” Any (5) TOTAL QUESTION 3: [50] TOTAL SECTION B: [100] GRAND TOTAL: 150 Copyright reserved Please turn over