Life Sciences Grade 12 P1 Free State June 2025 QP

education Department of Education FREE STATE PROVINCE GRADE 12 LIFE SCIENCES P1 June 2025 TOTAL: 150 TIME: 2/2 HOURS This question paper consists of 15 pages.

Life Sciences P1 2 FS June 2025 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. de 2: 10. 11. 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 question. Make ALL drawings in pencil and label them in blue or black ink. Draw diagrams, tables or flow charts only when asked to do so. The diagrams in this question paper are NOT necessarily drawn to scale. Do NOT use graph paper. You must use a non-programmable calculator, protractor and a compass, where necessary. Write neatly and legibly. Copyright reserved Please turn over

Life Sciences P1 3 FS June 2025 SECTION A QUESTION 1 AeA Various options are given 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 1.1.9) in the ANSWER BOOK, for example 1.1.10 D. 1.1.1. The structure that receives vibrations from the malleus and transmits it to the stapes. A Ossicles B_Incus C Tympanum D_ Round window 1.1.2 The part of the female reproductive system that forms the birth canal during labour. A Uterus B_ Fallopian tube C Vagina D Endometrium 1.1.3. The structure in an amniotic egg that removes waste products. A Amnion B Allantois C Yolk sac D- Chorion 1.1.4 The diagram below represents a cochlear implant in a human ear. Ear Which part of the brain is connected to the cochlear implant? A Cerebellum B Corpus callosum Cc Cerebrum D Medulla oblongata Copyright reserved Please turn over

Life Sciences P1 4 FS June 2025 1135 The cornea and the lens are both ... A opaque. B transparent. C elastic. D_ inelastic. 1.1.6 Which ONE of the following parts secretes an alkaline fluid to neutralise the acid in the vagina? Scrotum Prostate gland Testis Vas deferens 0NWU>Y 1A7 QUESTIONS 1.1.7 AND 1.1.8 ARE BASED ON THE DIAGRAM BELOW SHOWING A DEVELOPING FOETUS Which labelled part maintains the body temperature of the foetus? leone 2 ANDO 1.1.8 Which ONE of the following is the function of the umbilical vein in T. A Carries useful products from the foetus to the placenta. B_ Carries waste products from the foetus to the placenta. C_ Carries waste products from the placenta to the foetus. D_ Carries useful products from the placenta to the foetus. Copyright reserved Please turn over

Life Sciences P1 5 FS June 2025 1.1.9 The normal site of fertilisation in a human female is the ... A uterus B_ ovary C vagina D fallopian tube (9 x 2) (18) 1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.9) in the ANSWER BOOK. 1.2.1 The part of the male reproductive system that stores sperm cells until they are mature 1.2.2 The process where the sperm and ovum fuse inside the female’s body 1.2.3 The behaviour where an organism spends time and energy to protect and feed young offspring 1.2.4 A disorder that occurs because of the body's inability to produce insulin 1.2.5 The site where oogenesis takes place in the human body 1.2.6 The functional connection between two successive neurons 1.2.7. A ball of cells that forms during embryonic development 1.2.8 The period between ages 10 and 12 years when the human sex organs develop and produce gametes 1.2.9 Finger-like projections that develops from the outer membrane of an embryo after implantation (9x 1) (9) 1.3 Indicate whether each of the descriptions 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 | COLUMN II 1.3.1 The structure in the ear that A: Tympanic membrane converts vibrations into pressure B: Oval window waves 1.3.2 Autonomic nervous system A: Somatic system B: _ Sympathetic & parasympathetic 1.3.3 Contains photoreceptors A: Choroid B: Retina (axa) Copyright reserved Please turn over

Life Sciences P1 6 FS June 2025 1.4 The diagram below represents the male reproductive system. WSJ Bladder 1.4.1. Give the LETTER and NAME of the part: (a) Where meiosis takes place. (b) That forms part of both the urinary and reproductive systems. (c) That secrets a fluid which improves sperm movement. 1.4.2 Name the hormone responsible for the development of the secondary sexual characteristics in males. Copyright reserved Please turn over (1) (7)

Life Sciences P1 7 FS June 2025 1.5 The diagram below represents parts of the central nervous system. 1.5.1. Give the LETTER and NAME of the parts responsible for: (a) Connecting the two hemispheres of the brain. (2) (b) Heartbeat (2) (c) Memorising (2) 1.5.2 Name the TWO components of the central nervous system shown in the diagram.? (2) 1.5.3 State TWO ways in which the brain is protected. (2) (10) TOTAL SECTION A: 50 Copyright reserved Please turn over

Life Sciences P1 8 FS June 2025 SECTION B QUESTION 2 2.1 Read the extract on the reproduction of Suriname toads. The male Suriname (Pipa pipa) toad makes a clicking call in the water to attract the female. The male then grasps the female from above. The skin of her back begins to thicken. The female releases one ovum at a time and the female can have more than 100 eggs embedded in the skin of her back. The male fertilises the eggs on her back. The skin continues to thicken around each egg so that the eggs are embedded within her skin. The development stages from a tadpole (larvae) to a juvenile takes place inside her skin and eventually the toadlets emerge from her back by squeezing out through the openings in her skin. Eggs imbedded in the skin 2.1.1 Name the type of fertilisation that occurs during reproduction in toads. 2.1.2 Explain TWO ways in which the Suriname (Pipa pipa) toad increases the chances of fertilisation. 2.1.3 Name the type of reproductive strategy in the embryonic development that can be seen in the Suriname (Pipa pipa) toad. Copyright reserved Please turn over (1) (4) (1) (6)

Life Sciences P1 8 FS June 2025 SECTION B QUESTION 2 2.1 Read the extract on the reproduction of Suriname toads. The male Suriname (Pipa pipa) toad makes a clicking call in the water to attract the female. The male then grasps the female from above. The skin of her back begins to thicken. The female releases one ovum at a time and the female can have more than 100 eggs embedded in the skin of her back. The male fertilises the eggs on her back. The skin continues to thicken around each egg so that the eggs are embedded within her skin. The development stages from a tadpole (larvae) to a juvenile takes place inside her skin and eventually the toadlets emerge from her back by squeezing out through the openings in her skin. Eggs imbedded in the skin 2.1.1 Name the type of fertilisation that occurs during reproduction in toads. 2.1.2 Explain TWO ways in which the Suriname (Pipa pipa) toad increases the chances of fertilisation. 2.1.3 Name the type of reproductive strategy in the embryonic development that can be seen in the Suriname (Pipa pipa) toad. Copyright reserved Please turn over (1) (6)

Life Sciences P1 9 FS June 2025 2.2 Diagram 1 below represent the development of the follicle and Diagram 2 represents the levels of hormones during the menstrual cycle. Diagram 1 ‘B® @ Diagram 2 Hormone B Hormone A -* 2 ~ Blood hormone concentration s , 2.2.1 2:22. 2.2.3 2.2.4 Identify: (a) X (b) Process Y (c) The hormone responsible for the formation of structure Z Name the TWO parts of the menstrual cycle. Give TWO visible reasons why this female is not pregnant. Describe the process of oogenesis. 2.3 Give FOUR functions of the placenta. Copyright reserved Please turn over

Life Sciences P1 10 FS June 2025 2.4 The diagram below shows a reflex arc. The arrows indicate the direction of nerve impulse transmission. effector 2.4.1 Label part B. (1) 2.4.2 Define a reflex action. (3) 2.4.3. Tabulate TWO structural differences between neuron A and D. (5) 2.4.4 Explain why the brain is not involved in this reflex action. (2) 2.4.5 If aperson suffers from multiple sclerosis, explain the effect of this disease on the reflex action. (3) (14) Copyright reserved Please turn over

Life Sciences P1 11 FS June 2025 2.5 Read the passage below to answer the questions that follow. The reproductive hormones Oestrogen and Progesterone increase the thickening of the endometrium during the menstrual cycle. An investigation was conducted on the influence of oestrogen and progesterone on the thickening of the endometrium. The procedure was done as follow: e 80 females of the same age were asked to participate (20 in each group). e The females were all healthy and not using any hormonal supplements. e The females followed the same diet and exercise program over 10 days. Group 1: No hormones given to the women Group 2: Only Oestrogen was given to the women Group 3: Only Progesterone was given to the women Group 4: Oestrogen followed by progesterone was given to the women Endometrium thickness was recorded every 2 days for 10 days. Day Control Oestrogen | Progesterone | Oestrogen + (No Hormones) Only Only Progesterone 0 0.5 um 0.5 um 0.5 um 0.5 um 2 0.6 um 1.2 um 0.6 um 1.2 um 4 0.7 um 2.0 um 0.8 um 2.0 um 6 0.7 um 2.5 um 1.0 um 3.5 um 8 0.7 um 2.5 um 1.2 um 4.0 um 10 0.7 um 2.5 um 1.3 um 4.5 um 2.5.1 Identify the independent variable. (1) 2.5.2 Explain the significance of including Group 1 in the investigation. (2) 2.5.3 State TWO ways in which the validity of the results was ensured. (2) 2.5.4 State a conclusion for this investigation. (2) (7) Copyright reserved Please turn over

Life Sciences P1 12 FS June 2025 2.6 The diagram below shows different parts of the ear. 2.6.1 Identify: (a) The TWO types of receptors in part A that helps to maintain balance in the human body. (2) (b) The neuron in B that transmits the impulse to the cerebrum. (1) 2.6.2 Give ONE function of D. (1) 2.6.3 Explain the role of part C in the interpretation of sound. Ss TOTAL QUESTION 2: [50] Copyright reserved Please turn over

Life Sciences P1 13 FS June 2025 QUESTION 3 3.1. The diagram below represents the structure of the human eye. 3.1.1 Identify: (a) Fluid A (1) (b) PartB (1) (c) LayerD (1) 3.1.2 Explain TWO structural adaptations of part E for its function. (4) 3.1.3 Describe the role of part C in the pupillary mechanism when exposed to dim light. (5) 3.1.4 Describe the changes that takes place in the eye to be able to read the time on your wristwatch. (6) (18) 3.2 If Andrew looks at an object that is close to him, he sees it clearly and with focus. When he looks at objects far away, they are out of focus. 3.2.1 Identify the visual defect that Andrew probably has. (1) 3.2.2 Explain why Andrew sees distant objects to be out of focus. (2) (3) 3.3 Draw a labelled diagram of a multipolar neuron. (5) Copyright reserved Please turn over

Life Sciences P1 14 FS June 2025 3.4 The diagram below represents endocrine glands in humans. 3.4.1 3.4.2 3.4.3 3.4.4 Give the LETTER and the NAME of the endocrine gland responsible for: (a) Reabsorption of water. (b) Maintenance of metabolic rate. (c) Control of glucose levels in blood. Give the NAME of the hormone that: (a) Stimulates follicle development in the ovary. (b) Promotes the growth of the skeleton and skeleton muscles. (c) Increases glucose levels in the blood. Name the disorder caused by an imbalance in thyroxin levels. Explain why the pancreas is considered both an exocrine and endocrine gland. Copyright reserved Please turn over (1) (1) (1) (4) (14)

Life Sciences P1 15 FS June 2025 3.5 The diagram below represents a “fight or flight” reaction that is controlled by hormones. 3.5.1 Give THREE characteristics of hormones. 3.5.2 Identify the hormone responsible for the “fight and flight” reaction. 3.5.3 Explain THREE effects of the hormone in QUESTION 3.5.1. TOTAL QUESTION 3: TOTAL SECTION B: GRAND TOTAL: (1) (6) (10) [50] 100 150