1 Diagram 1 shows a fume chamber in the science laboratory. Which of the following is a function of the fume chamber? flag bookmark A To carry out experiments that use volatile, flammable, poisonous, corrosive and odorous substances B To avoid contamination when microbiological activities are carried out C Closed space to protect users and the surrounding area from harmful pathogens D To clean the apparatus used in activities involving the use of dangerous chemicals T4 Chapter 1.1 Personal Protective Equipment A fume chamber removes harmful fumes from the work area, so it is used for experiments with volatile, flammable, poisonous, corrosive and odorous substances.
2 Which of the following is the correct way to manage biological waste substances? flag bookmark A Sharp equipment such as syringes and needles should be autoclaved before being stored in a safe place before disposal B Specimens such as blood and serum do not need to be autoclaved to decontaminate before being disposed of directly into the sewage system C Non-sharp solids such as tissue and culture medium can be placed in biohazard bins without having to be wrapped in biohazard plastic bags D Specimens such as laboratory animals and experimental animals should be wrapped in absorbent material, tightly packed in biohazard plastic bags and frozen before disposal T4 Chapter 1.2 Disposal of Waste Laboratory and experimental animals (carcasses) are wrapped in absorbent material, packed tightly in biohazard plastic bags and frozen before disposal. Sharp tools go into sharps containers, and blood and culture media must be autoclaved.
3 The following information shows the steps involved in Cardiopulmonary Resuscitation (CPR). S : Open the airways P : Chest compressions are made Q : Give breathing aid M : Check the reaction of the victim Which of the following shows the correct sequence of the steps involved? flag bookmark A S, P, M, Q B M, Q, S, P C P, Q, S, M D M, S, P, Q T4 Chapter 2.1 Cardiopulmonary Resuscitation (CPR) CPR starts by checking the victim's response (M), then calling for help, giving chest compressions (P), opening the airway (S) and giving rescue breaths (Q): M, S, P, Q according to the answer scheme.
4 Diagram 2 shows a person using a sphygmomanometer to measure blood pressure. The screen shows the readings 118 (top), 65 (middle) and 76 (bottom). Which of the following shows the correct reading? | | Systolic pressure | Diastolic pressure | Pulse rate | |---|---|---|---| | A | 76 | 65 | 118 | | B | 118 | 65 | 76 | | C | 65 | 118 | 76 | | D | 118 | 76 | 65 | flag bookmark A A B B C C D D T4 Chapter 3.3 Blood Pressure A digital sphygmomanometer shows the systolic pressure at the top (118 mmHg), the diastolic pressure in the middle (65 mmHg) and the pulse rate at the bottom (76 beats per minute).
5 Table 1 shows the Body Mass Index (BMI) of four students. | Students | Body Mass Index, BMI (kg/m^2^) | |---|---| | Nabila | 27.0 | | Athirah | 33.4 | | Fasha | 16.5 | | Mashitah | 20.1 | Which students belong to the group of desirable weight and obese? | | Desirable weight | Obese | |---|---|---| | A | Nabila | Fasha | | B | Fasha | Mashitah | | C | Mashitah | Athirah | | D | Athirah | Nabila | flag bookmark A A B B C C D D T4 Chapter 3.4 Body Mass Index (BMI) Desirable (normal) weight is a BMI of 18.5 – 24.9, so Mashitah (20.1) has desirable weight. Obese is a BMI of 30 and above, so Athirah (33.4) is obese.
6 Which of the following is a socio-scientific issue in the transportation sector? flag bookmark A The price of vehicles is too high B The burning of fuel by the engines of vehicles releases greenhouse gases C The usage of green energy resources by vehicles affects our health D The number of heavy vehicles on the road is increasing T4 Chapter 4.5 Transportation Sector Burning fuel in vehicle engines releases greenhouse gases such as carbon dioxide, which contributes to global warming. This is a socio-scientific issue in the transportation sector.
7 What can you do to help reduce greenhouse gas emissions and decrease the carbon footprint? flag bookmark A Switch off electrical appliances when not in use B Use plastic bags C Use a cloth dryer D Cut down trees T4 Chapter 4.6 Green Technology and Life Switching off electrical appliances when not in use saves electricity. Less electricity needs to be generated by burning fuel, so greenhouse gas emissions and the carbon footprint are reduced.
8 Diagram 3 shows process Q that occurs in meiosis. What is the importance of process Q? flag bookmark A To control cell division B To determine the gender of a baby C To produce variation in humans D As a method of asexual reproduction T4 Chapter 5.1 Cell Division Process Q is crossing over between homologous chromosomes during meiosis. It produces new combinations of genes, which causes variation in humans.
9 Diagram 4 shows a cross between a white flower plant and a red flower plant. | | | | | |---|---|---|---| | Parents | White flower plant | × | Red flower plant | | First generation | White flower plant | | Red flower plant | | Ratio | 1 | : | 1 | If G represents the dominant gene for red flower and g represents the recessive gene for white flower, what is the genotype of the parents? | | White flower plant | Red flower plant | |---|---|---| | A | GG | gg | | B | gg | GG | | C | Gg | gg | | D | gg | Gg | flag bookmark A A B B C C D D T4 Chapter 5.2 Inheritance The offspring show a 1 : 1 ratio of red to white flowers. This happens when a heterozygous red plant (Gg) is crossed with a white plant (gg). So the white parent is gg and the red parent is Gg.
10 Which of the following is **not** a good effect of Genetic Engineering Technology in life? flag bookmark A Genetic research creates new species and causes the extinction of some original species B Production of insulin and enzymes from bacteria is important for human health C Quality crops and livestock are produced D Genetic diseases are detected and can be treated at an early stage T4 Chapter 5.4 Genetic Engineering Technology Creating new species that cause the extinction of some original species is a bad effect of genetic engineering. The other options are good effects.