SNGS Prelim 2025 Biology P2 QP

1 Name: _________________________ ( ) Class: _____________ PRELIMINARY EXAMINATION GENERAL CERTIFICATE OF EDUCATION ORDINARY LEVEL BIOLOGY 6093/02 Wednesday 27 August 2025 1 hour 45 minutes _____________________________________________________________________________________ READ THESE INSTRUCTIONS FIRST Write your name, register number, and class on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use paper clips, glue or correction fluid. Answer all questions. Write all answers in the answer space provided. The use of a scientific calculator is expected, where appropriate. You are reminded of the need for clear presentation in your answers. The number of marks is given in brackets [ ] at the end of each question or part question. ___________________________________________________________________________________ This document consists of 23 printed pages. [Turn over] For Examiner’s Use Section A (70) Section B (10) 10 Either 10 Or Total (80)

2 Section A Answer all questions in this section. Write your answers in the spaces provided. 1 a) Fig. 1.1 is a diagram representing the concentration of oxygen inside and outside an animal cell. Fig. 1.1 (i) Identify the part of the cell that X represents. ……………………………………………………………………………………... [1] (ii) Draw an arrow on Fig. 1. 1 to show the net direction of movement of the oxygen molecules in the absence of energy. [1] outside cell inside cell oxygen molecule X

3 b) Fig. 1.2 shows a dialysis machine for treating people who have kidney failure. The dialysate is a solution of glucose and salts. Fig. 1.2 When the patient is undergoing dialysis, explain (i) why red blood cells and blood proteins are not lost from blood, ………………………………………………………………………………………. ………………………………………………………………………………………. [1] (ii) how the normal glucose concentration of blood is maintained. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. ………………………………………………………………………………………. [2] blood vessels dialysis membrane blood out blood in dialysate out dialysate in

4 A person with kidney failure received regular dialysis treatment for 17 days. Fig. 1.3 shows how the concentration of urea in the blood changed over the 17 days. Fig. 1.3 (iii) State how many times the person received dialysis treatment. …………………………………………………