NBSS 25 4E Prelim QP

[Turn over NAVAL BASE SECONDARY SCHOOL PRELIMINARY EXAMINATION, 2025 O Name: _______________________( ) Class: _____________ SCIENCE (BIOLOGY) Paper 4 Biology 5088/04 26 August 2025 Setter : Mr Alfiyan 1 hour 15 minutes No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class at the top of the page. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A (55 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (10 marks) Answer only one question. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 55 Section B 10 Total 65 Parent’s/ Guardian’s Signature This document consists of 19 printed pages and 1 blank page.

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[Turn over 3 Section A Answer all questions in the spaces provided. 1 The liver is an organ with many different functions. Fig. 1.1 shows the liver, its blood supply and other associated organs. The blood vessels are labelled P to R. Fig. 1.1 (a) (i) A person eats a meal containing protein and carbohydrate. Complete Table 1.1 to show which blood vessel P,Q or R has the highest concentration of glucose, oxygen and urea respectively as this meal is absorbed. Table 1.1 substance transported by blood letter of blood vessel in Fig. 1.1 glucose …………………… oxygen …………………… urea …………………… to heart from heart aorta liver gall bladder duodenum vena cava bile duct P Q R [3]

4 (ii) State one difference in the structure of blood vessel P and blood vessel Q. ............................................................................................................................... .......................................................................................................................... [1] (b) Cholesterol can accumulate in the gall bladder to form gall stones. These gall stones may stop bile flowing from the liver through the bile duct and into the duodenum. Explain the possible effect of gall stones on the digestion of fats. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [2] [Total: 6]

[Turn over 5 2 Fig. 2.1 shows the internal structure of the human heart and associated blood vessels. Fig. 2.1 (a) On the diagram, draw a line to name and label the following: (i) the blood vessel that transports blood to the lungs, and (ii) the chamber that exerts the greatest force when its walls contract. [2] (b) Fig. 2.2 shows a semi-lunar (aortic) valve in the open and closed positions. Fig. 2.2 Fig. 2.3 shows the same heart valve in the open and closed positions in a person with Aortic Valve Disease (AVD). ` Fig. 2.3 valve open valve closed valve open valve closed

6 (i) Explain how AVD affects the flow of blood when the heart contracts and relaxes. ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ...............................................................................................................................[3] (ii) Suggest some effects that AVD could have on the person. ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ................................................................................................................................... ...............................................................................................................................[2] (c) Oxygen is transported in the blood by red blood cells. Explain two adaptations of the red blood cell for its function. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... .......................................................................................................................................[2] [Total: 9]

[Turn over 7 3 Fig. 3.1 shows the percentage of antibiotic resistance in a certain strain of bacteria compared to the years since a new antibiotic was introduced. Fig 3.1 (a) Compare the percentage increase in antibiotic resistance between years 2 and 4 and years 6 to 8 in Fig. 3.1. ........................................................................................................................................... .......................................................................................................................................[1] (b) Superbugs are bacteria that develop a ntibiotic resistance, which may be accelerated by the misuse of antibiotics. Explain how the misuse of antibiotics may lead to the creation of superbugs. ........................................................................................................................................... ........................................................................................................................................... ....................................................