1 Diagram 1 shows a personal protective equipment. What is the tool? flag bookmark A Safety goggles B Face mask C Lab coat D Gloves T4 Chapter 1.1 Personal Protective Equipment Diagram 1 shows a face mask, which protects the nose and mouth from inhaling harmful substances and pathogens.
2 The statement below is about biological waste. > This solid biological waste is decontaminated and put into a leak-proof autoclave bag. Based on the above statement, state the category of biological waste that corresponds to the statement. flag bookmark A Category A B Category B C Category C D Category D T4 Chapter 1.2 Disposal of Waste Category B biological waste is non-sharp solid waste such as culture plates and gloves. It is decontaminated and put into a leak-proof autoclave bag.
3 Which of the following types of fire extinguishers can be used to extinguish fires caused by reactive metals? flag bookmark A Water B Foam C Dry powder D Carbon dioxide T4 Chapter 1.3 Fire Extinguishers Fires involving reactive metals (Class D) are put out with a dry powder extinguisher, which smothers the fire. Water reacts with reactive metals and makes the fire worse.
4 Diagram 2 shows an unconscious victim. The person is unconscious and not breathing. What should be done first before emergency aid is given? flag bookmark A Give five initial rescue breaths B Give chest compressions 30 times C Tilt the victim's head back and lift the chin D Ask for help from any bystander to contact 999 T4 Chapter 2.1 Cardiopulmonary Resuscitation (CPR) Before giving emergency aid, the rescuer should first ask bystanders to call for help (999) so that medical help is on the way. The answer scheme gives D.
5 Human body temperature should be in the normal range. What is body temperature? flag bookmark A Body heat B A thing that is measured with a thermometer C A degree of coldness of the human body D The degree of hotness and coldness of the human body T4 Chapter 3.1 Body Temperature Body temperature is the degree of hotness or coldness of the human body.
6 Diagram 3 shows the blood pressure reading for a student. What is his systolic and diastolic pressure? | | Systolic pressure (mmHg) | Diastolic pressure (mmHg) | |---|---|---| | A | 80 | 120 | | B | 90 | 100 | | C | 100 | 90 | | D | 120 | 80 | flag bookmark A A B B C C D D T4 Chapter 3.3 Blood Pressure The upper reading on the monitor (100 mmHg) is the systolic pressure and the lower reading (90 mmHg) is the diastolic pressure.
7 Which of the following is the best reason for a forest to be known as the 'lungs of the Earth'? flag bookmark A The rainforest is a rainfall area B Forests are the habitat for many animals C Green plants carry out the process of photosynthesis D There are many natural resources available from the forest T4 Chapter 4.1 Environmental Sustainability Forests are called the 'lungs of the Earth' because green plants carry out photosynthesis, absorbing carbon dioxide and releasing oxygen.
8 Diagram 4 shows a process that occurs during meiosis. What is the effect of the process? flag bookmark A Four new daughter cells will be formed B New genetic combinations of traits would be produced C Gene mutations and chromosome mutations will occur D Chromosomes will not divide completely T4 Chapter 5.1 Cell Division Diagram 4 shows crossing over between homologous chromosomes during prophase I of meiosis. Segments of chromatids are exchanged, producing new genetic combinations of traits.
9 Diagram 5 shows a boy with a mutation. Which of the following is the genotype of the boy? flag bookmark A 44 + XX B 44 + XY C 45 + XY D 45 + XX T4 Chapter 5.3 Mutation The boy has Down syndrome, which is caused by an extra chromosome 21. His genotype is 45 autosomes + XY (47 chromosomes).
10 Which of the following is an environmental factor that affects variation? flag bookmark A Mutation B Sunlight C Crossing over process D Random chromosome arrangement T4 Chapter 5.5 Variation Sunlight is an environmental factor that affects variation, such as skin colour. Mutation, crossing over and random chromosome arrangement are genetic factors.