2018 RVHS H2 Biology Prelims Paper 2 Answers

1 River Valley High School Year 6 H2 Biology 9744 Paper 2 2018 Preliminary Examination RIVER VALLEY HIGH SCHOOL YEAR 6 PRELIMINARY EXAMINATION CANDIDATE NAME CENTRE NUMBER S CLASS INDEX NUMBER H2 BIOLOGY 9744/02 Paper 2 Structured Questions 10 Sep 2018 2 hours Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name in the spaces at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions in the spaces provided on the Question Paper. 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. At the end of the examination, fasten all your work together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 / 6 2 / 11 3 /12 4 / 8 5 / 12 6 / 10 7 / 10 8 / 11 9 / 10 10 /5 11 /5 Total / 100 _____________________________________________________________________ This document consists of 24 printed pages.

2 River Valley High School Year 6 H2 Biology 9744 Paper 2 2018 Preliminary Examination Answer all questions. 1 Fig.1.1 shows a cell undergoing telophase and process X simultaneously. Fig. 1.1 Source: David M. Phillips, 2014 (a) Name structure A. [1] mitochondrion (b) Name process X and explain how it supports the cell theory. [2] 1. Cytokinesis 2. The process shows that all cells come from pre-existing cells

3 River Valley High School Year 6 H2 Biology 9744 Paper 2 2018 Preliminary Examination (c) Outline the role of A and explain its significance to process X. [3] 1. (Site of) ATP synthesis; 2. during aerobic respiration 3. Provide energy 4. to form contractile ring of filaments 5. to form cleavage furrow 6. so as to separate the cell (into two) [Total: 6]

4 River Valley High School Year 6 H2 Biology 9744 Paper 2 2018 Preliminary Examination 2 (a) Explain how the structure of fatty acids allow triglycerides to be a good store of energy. [2] Fatty acids makes triglycerides 1. (S) non-polar/uncharged/large/long hydrocarbon chain 2. (F) can be stored (in large amounts) without having any significant effect on the water potential of a cell 3. (S) have large number of hydrogen atoms 4. (F) store large amounts of energy

5 River Valley High School Year 6 H2 Biology 9744 Paper 2 2018 Preliminary Examination Fig. 2.1 shows the structure of a lipoprotein. Lipoproteins transport fats from the liver to other tissues via the bloodstream. The proteins of lipoproteins play an important role in the deposition of fats to the correct tissue. Fig. 2.1 (b) Describe how lipoprotein