2022_CHS_Biology Practical Notes

CATHOLIC HIGH SCHOOL DEPARTMENT OF SCIENCE PRACTICAL ASSESSMENT REVISION KIT FOR BIOLOGY 2022 CONTENTS I. PRACTICAL INFORMATION SHEET Page 2 II. NOTES ON COMPETENCIES SKILLS Page 5 III. SOLUTIONS TO EXERCISES Page 39 IV. PRACTICE QUESTIONS Page 44 V. MARK SCHEME TO PRACTICE QUESTIONS Page 56 VI. APPENDICES Page 61 This revision kit only serves as a supplement to the practical file containing the weekly practical tasks. Revise the practical file prior to assessment.

CHS | Adapted by Mr. Lee Joon Kiat | Updated Nov 2019 Page | 2 PRACTICAL ASSESSMENT Paper 3 (1 h 50 min, 40 marks) This paper will comprise two or three compulsory practical questions, based mainly on experimental skills and investigations.  Planning (P)  Manipulation, measurement and observation (MMO)  Presentation of data and observations (PDO)  Analysis, conclusions and evaluation (ACE) One or more of the questions may incorporate assessment of Planning (P) and require candidates to apply and integrate knowledge and understanding from different sections of the syllabus. The assessment of PDO and ACE may include questions on data-analysis which do not require practical equipment and apparatus. The assessment of Planning (P) will have a weig hting of 15%. The assessment of skill areas MMO, PDO and ACE will have a weighting of 85%. This accounts for 20% of the total weighting in the subject for the GCE O-Level assessment. Candidates are not allowed to refer to notebooks, textbooks or any other information during the assessment.

CHS | Adapted by Mr. Lee Joon Kiat | Updated Nov 2019 Page | 3 COMPETENCY LIST (A) Planning (P) Candidates should be able to (A1) identify key variables for a given question/problem (A2) outline an experimental procedure to investigate the question/problem (A3) describe how the data should be used in order to reach a conclusion (A4) identify the risks of the experiment and state precautions that should be taken to keep risks to a minimum (B) Manipulation, measurement and observation (MMO) Candidates should be able to (B1) set up apparatus correctly by following written instructions or diagrams (B2) use common laboratory apparatus and techniques to collect data and make observations (B3) describe and explain how apparatus and techniques are used correctly (B4) make and record accurate observations with good details and measurements to an appropriate degree of precision (B5) make appropriate decisions about measurements or observations (C) Presentation of data and observations (PDO) Candidates should be able to (C1) present all information in an appropriate form (C2) manipulate measurements effectively for analysis (C3) present all quantitative data to an appropriate number of decimal places/ significant figures (D) Analysis, conclusions and evaluation (ACE) Candidates should be able to