1 Which of the following materials can be poured into a laboratory sink? flag bookmark A Oil B Concentrated sulphuric acid C Baking soda solution D Sulphur T4 Chapter 1.2 Disposal of Waste Baking soda solution is safe to pour down the sink because it is a dilute, water-soluble neutral salt solution, unlike oil, concentrated acid, or solid sulphur.
2 Which is the biological waste category for syringes and needles? flag bookmark A Category B B Category C C Category A D Category D T4 Chapter 1.2 Disposal of Waste Syringes and needles are sharps, which fall under Category A because they pose a puncture and infection hazard.
3 Nora suddenly collapses, unconscious and unresponsive. As a friend who is with Nora, what is the first action to be taken? flag bookmark A Perform cardiopulmonary resuscitation (CPR) B Perform chest compressions 120 times C Check if the victim is breathing or not D Check the victim's response, whether OK or not T4 Chapter 2.1 Cardiopulmonary Resuscitation (CPR) Check for responsiveness first to determine if the victim is conscious; if unresponsive, then proceed to call for help and check breathing before starting CPR.
4 Diagram 1 shows a blood pressure reading of a patient. | 150 / 95 | |:---:| What will happen to the patient if the reading continues constantly? flag bookmark A Hypertension B Obesity C Lack of oxygen in blood D Failure in respiratory system T4 Chapter 3.3 Blood Pressure The reading of 150/95 is above the normal range, so persistent high blood pressure means the patient has hypertension.
5 Diagram 2 shows a conversation between two students. > **Student 1:** Sari, you look healthier than before. > **Sari:** I practise a healthier diet and exercise every day. My body is no longer excessive now. Which of the following is Sari's possible Body Mass Index (BMI)? flag bookmark A 17 kg m⁻² B 26 kg m⁻² C 21 kg m⁻² D 29 kg m⁻² T4 Chapter 3.4 Body Mass Index (BMI) Since Sari says her body is no longer excessive, she now has a normal BMI. Therefore, 21 kg m⁻² is the only option within the healthy range.
6 What are the benefits of using solar-powered vehicles? flag bookmark A Reduce the cost of maintenance B Increase the efficiency of manpower C Reduce the release of greenhouse gases D Reduce the number of vehicles on the road T4 Chapter 4.5 Transportation Sector Solar-powered vehicles produce no tailpipe emissions, so they cut the release of greenhouse gases compared to petrol or diesel cars. This directly addresses climate change, which the other options do not.
7 Diagram 3 shows a process of cell division. Where does the process take place in the human body? flag bookmark A Reproductive cells B Somatic cells C Testis D Ovary T4 Chapter 5.1 Cell Division The diagram illustrates mitosis, which occurs in somatic cells for growth and repair, unlike meiosis that happens in reproductive organs.
8 Diagram 4 shows the karyotypes of two individuals, P and Q. What type of mutation has occurred in individuals P and Q? flag bookmark A DNA mutation B Cell mutation C Chromosomal mutation D Gene mutation T4 Chapter 5.3 Mutation The karyotypes show a change in chromosome number (P has an extra chromosome at position 23, Q has one missing), which is a chromosomal mutation. Gene or DNA mutations do not alter chromosome number.
9 Diagram 5 shows a method to detect gene disorders. State the advantage of using the procedure. flag bookmark A Able to identify the gender of babies earlier B Able to identify the type of abnormality in babies earlier C Able to identify biological relationships between individuals D Able to treat or prevent diseases T4 Chapter 5.3 Mutation Amniocentesis samples fetal cells in the amniotic fluid, allowing karyotyping to identify the specific type of genetic abnormality before birth.
10 Diagram 6 shows a histogram for a variation. Which of the following is an example of the variation? flag bookmark A Height B Blood group C Type of thumbprint D Ability to roll tongue T4 Chapter 5.5 Variation The histogram shows a bell-shaped curve, indicating continuous variation. Height is a continuous trait, unlike blood group, thumbprint type, or tongue rolling, which are discontinuous.