YTSS PURE BIO 1

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SEC 4 EXPRESS BIOLOGY (6093/2) DATE : 26 August 2024 DAY : Monday DURATION: 1 hr 45 min MARKS: 80 marks READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Section A Answer all the questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. You may use an approved calculator. Section A Section B TOTAL This question paper consists of 18 printed pages

2 SECTION A (70 MARKS) Answer all questions in this section. 1 The malarial pathogen, P. falciparum, enters red blood cells after a person becomes infected. Fig. 1.1 shows a sample of an infected person’s blood with 3 red blood cells which are infected with P. falciparum. Fig. 1.1 (a) With reference to Fig. 1.1, suggest two ways how the presence of P. falciparum affects a red blood cell. [2] 1. ...……………………………………………………………………………………… …………………………………………………………………………………………… 2. ...……………………………………………………………………………………… …………………………………………………………………………………………… (b) Using your answers from (a), explain how the change might affect the function of the red blood cell. [2] …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… (c) State three other components of blood not shown in Fig. 1.1. [2] …………………………………………………………………………………………… …………………………………………………………………………………………… infected red blood cells

3 2 Plants have specialised cells for the efficient transport of manufactured food. Table 2.1 shows some of the features of two different types of cells found in plant tissue, which are adapted for the efficient transport of manufactured food. Key ✓ present  absent Table 2.1 (a) Name three substances that are transported by these specialised cells. [2] …………………………………………………………………………………………… …………………………………………………………………………………………… (b) Identify both cell types: [2] Cell type A:………………………………………… Cell type B:………………………………………… (c) Explain how both cells work together to perform their function. [2] …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… feature of cell cell type A cell type B cytoplasm ✓ ✓ nucleus  ✓ mitochondria none many cellulose in the cell wall ✓ ✓ ribosomes  ✓

4 3 Fig. 3.1 shows some common morning glory flowers in two different colours.