DUNMAN 2025 Prelims Paper 1

This document consists of 21 printed pages. DUNMAN SECONDARY SCHOOL CANDIDATE NAME CLASS INDEX NUMBER PRELIMINARY EXAMINATION 2025 SECONDARY 4 EXPRESS BIOLOGY 6093/01 Paper 1 2 September 2025 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided unless this has been done for you. There are forty questions on this paper. Answer all questions. For each questions there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of an approved scientific calculator is expected, where appropriate.

2 6093/01/Prelim/4Exp/2025 1 Which organelle is not correctly paired with its cellular function? organelle function A endoplasmic reticulum transports proteins to the Golgi body B Golgi body stores proteins and carbohydrates C mitochondrion releases energy D ribosome joins amino acids together 2 The diagram shows a bacterial cell. Which cell structure makes bacteria useful in genetic modification? 3 The diagram shows the movement of water through part of a leaf. What processes are involved in the movement of water at these stages? 1−2 3−4 4−5 A diffusion evaporation osmosis B evaporation diffusion osmosis C osmosis diffusion evaporation D osmosis evaporation diffusion

3 6093/01/Prelim/4Exp/2025 4 The diagram represents the phloem pathway, with adjacent cells, from leaf to root in a plant. Which process is occurring between 1 to 2 and what is the effect on the water potential at 2? process from 1 to 2 water potential at 2 A active transport of sucrose becomes more negative B active transport of sucrose becomes less negative C diffusion of sucrose becomes more negative D diffusion of sucrose becomes less negative 5 Which row correctly identifies the chemical elements found in insulin? carbon hydrogen oxygen nitrogen A ✓ ✓ ✓ ✓ key B ✓ ✓ ✓ ✘ ✓ = present C ✓ ✘ ✓ ✘ ✘ = not present D ✘ ✓ ✘ ✓

4 6093/01/Prelim/4Exp/2025 6 Various substances are identified using the following procedures. What could the four substances be? P Q R S A glucose starch protein lipid B glucose sucrose starch protein C sucrose protein lipid starch D sucrose starch lipid protein

5 6093/01/Prelim/4Exp/2025 7 Which graph correctly shows possible changes in energy levels as a chemical reaction progresses with and without an enzyme? 8 The chart gives information about a car being driven at 110 km/h by someone who has not consumed alcohol. It shows how far the car travels from the time the driver sees a hazard and reacts by using the brakes and how far the car will then travel before finally stopping. If the same driver consumes alcohol before driving , the distance travelled before reacting to the hazard increase by 20%. What is the total distance travelled by the car before stopping? A 96 m B 100 m C 111.2 m D 115.2 m

6 6093/01/Prelim/4Exp/2025 9 The diagram represents a villus. Which row correctly describes the functions of the numbered parts? 1 2 3 A transports fats transports glucose absorbs digested food B transports fats transports glucose produces mucus C transports glucose transports fats absorbs digested food D transports glucose transports fats produces mucus 10 Which of the following statements is/are correct? 1 Bile breaks down fats to produce glycerol as one of the proudcts. 2 Chemical digestion of fats only begins in the small intestine. 3 The liver is part of the alimentary canal. A 1 and 2 only B 1 and 3 only C 2 only D 3 only

7 6093/01/Prelim/4Exp/2025 11 The diagram shows part of the human circulatory system. Where is the blood pressure and the speed of flow the lowest? lowest blood pressure lowest speed of flow A 1 4 B 2 3 C 3 2 D 4 1 12 Tobacco smoke contains substances that affect the functioning of the human body. substance effect W nicotine 1 decreases oxygenation of haemoglobin X carbon monoxide 2 increases risk of cancer Y tar 3 increases risk of blood clotting Which row shows the substances matched with their correct effects? A W-1, X-2, Y-3 B W-1, X-3, Y-2 C W-2, X-1, Y-3 D W-3, X-1, Y-2

8 6093/01/Prelim/4Exp/2025 13 The graph shows the volume of air breathed out quickly and with force, following a deep breath in, for three different people, X, Y and Z. What is an explanation for the differences shown? chronic bronchitis emphysema healthy lung function A X Y Z B X Z Y C Y Z X D Z Y X 14 The diagram represents some of the muscles involved with breathing. Which muscles are contracting during breathing in? A P and Q B P and R C Q and R D P, Q and R

9 6093/01/Prelim/4Exp/2025 15 How many molecules of carbon dioxide will be produced from the breakdown of two molecules of glucose in aerobic respiration? A 2 B 4 C 6 D 12 16 The diagram shows structures in a human which form and store urine. Liquids pass through tubes X, Y and Z in the directions shown by the arrows. Which statement about the volume of liquid passing through Y in one day is correct? A It is greater than that passing through X. B It is less than that passing through Z. C It is much less than that passing through X but slightly greater than that passing through Z. D It is slightly less than that passing through X but much greater than that passing through Z. 17 Hormones are involved in the co-ordination of the body. Which option correctly describes the nature of hormones? transported by destroyed by A plasma kidney B plasma liver C red blood cells kidney D red blood cells liver

10 6093/01/Prelim/4Exp/2025 18 The trigeminal nerve in humans connects the brain with the teeth and the skin on the face. When the dentist administers a local anaesthesia by injection, you can no longer feel pain and you cannot smile properly. Which statement correctly explains the effects of the local anaesthesia? 1 A The trigeminal nerve carries impulses from the brain to the teeth and back. B The trigeminal nerve contains motor neurones. C The trigeminal nerve contains motor and sensory neurones. D The trigeminal nerve contains sensory neurones. 19 The diagram shows a section through the eye. In the pupil reflex, which row shows the sites of the effectors and receptors involved? effectors receptors A 3 1 B 3 2 C 4 1 D 4 2