ACSI(I) Y4IP 2023 Biology Common Test Paper 1

1 TERM 1 CLASS TEST BIOLOGY Paper 1 Multiple Choice Section A 21 April 2023 1 Hour 45 Minutes Additional materials: Multiple Choice Answer Sheet INSTRUCTIONS TO CANDIDATES Write and shade your index number on the Multiple-Choice Answer Sheet in the spaces provided. Do not open this examination paper until instructed to do so. There are thirty questions on this question paper. Answer all questions. For each question, there are four possible answers, A, B, C, and D. Choose the one you consider correct and record your answer in soft pencil on the Multiple-Choice Answer Sheet provided. Read the instructions on the Multiple-Choice Answer Sheet very carefully. Each correct answer will score one mark. No marks will be deducted for a wrong answer. Any rough working should be done in the question booklet. Electronic calculators may be used. This paper consists of 15 printed pages including this cover page. Anglo-Chinese School (Independent) YEAR 4 INTEGRATED PROGRAMME / SBGE / ACS TERM 2 COMMON TEST

2 Section A: Multiple-Choice Questions 1 The diagram shows the kidney and three tubes associated with it. Where will urea be found? A X, Y and Z B X and Y C Y and Z D Z only 2 About 170 litres of fluid are filtered by the kidneys every day. Only 1.5 litres are excreted in urine. What happens to the remaining 168.5 litres? A it becomes tissue fluid B it is stored in the bladder C it is reabsorbed into the blood D it is lost as sweat 3 Which of the following, when present in urine, shows that a person is diabetic? A glucose B proteins C urea D water 4 What is the function of the cornified layer of the epidermis of human skin? A temperature regulation through sweating B perception of sensations of temperature, pain, and pressure C synthesis of vitamin D D prevention of uncontrolled water loss by evaporation

3 5 The diagrams show skin temperature in a human body when it is exposed to warm air and then exposed to cold air. What causes the observed change in skin temperature on exposure to cold air? A less blood flowing just below the skin B less blood going to the heart and lungs C more blood flowing just below the skin D more blood going to the heart and lungs 6 The graph shows changes in a person’s body temperature plotted against time. What could cause the changes in body temperature in periods 1 and 2? period 1 period 2 A reduced air temperature increased air temperature B reduced air temperature shivering C vigorous exercise increased sweating D vigorous exercise shivering

4 7 The graph below shows the changes in the concentration of a hormone in the blood of a person. Which statement explains the change in the hormone concentration between the points X and Y? A the hormone is being broken down by the liver B the hormone is being excreted by the kidneys C the hormone is being returned to the glands D the hormone is being used up the skeletal muscles 8 How does injection of insulin into diabetics lead to a lowering of blood glucose concentration? A by decreasing the permeability of cells to glucose B by increasing the excretion of glucose C by promoting the formation of hormone glucagon D by promoting the synthesis of polysaccharides 9 Adrenaline not only functions as a hormone in our body but can also be administered as a drug in life-saving situations. Under which condition(s) would the administration of adrenaline be useful? 1 low blood glucose concentration 2 low heart rate 3 low water potential of blood A 3 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3 X Y Concentration of hormone / arbitrary units Time / min

5 10 In which of the following do hormones travel around the body? A in blood plasma B in blood platelets C in red blood cells D in white blood cells 11 In order to measure the reaction time of a volunteer, the distance a ruler falls before it is caught by his hand is recorded. Which of the following correctly describes the path taken by the nerve impulses from his eyes to the muscles of his hand? A retina → optic nerve → spinal nerve → brain → spinal cord B retina → optic nerve → brain → spinal cord → spinal nerve C optic nerve → retina → spinal cord → brain → spinal nerve D optic nerve → retina → brain → spinal nerve → spinal cord 12 What coordinates a reflex action that requires a response from several parts of the body? A receptors B endocrine glands C muscles D spinal cord 13 The drug atropine has a similar shape to acetylcholine and stops the effect of acetylcholine. Nerve gas inhibits the activity of cholinesterase. Cholinesterase is an enzyme that breaks down acetylcholine. What will be the effects of these substances on the rate of transmission of impulses across a synapse? atropine nerve gas A increased increased B increased reduced C reduced increased D reduced reduced

6 14 Which structure in the motor neuron is required for fast conduction of nerve impulse? 15 The diagram below shows certain parts of the eye when focusing on a distant object. Which of the following is the correct description of the state of S, T and the lens? S T lens A relaxed contracted more convex B contracted slackened more convex C relaxed taut less convex D taut relaxed less convex

7 16 The graph shows how the diameter of the pupil of a person’s eye changed during the course of two minutes. What happens to the light intensity at X and which muscles begin to contract? light intensity iris muscles contracting A decreases circular B decreases radial C increases circular D increases radial time/minutes pupil diameter

8 17 The diagram below shows a small section of the retina. Which arrow shows the direction that the light reaches the retina, and at low level light intensity, which of the receptor cells are activated after a few minutes, and which neurone will send impulses? direction of light impulse sent via neurone receptor cells activated A 1 3 6 B 1 4 5 C 2 3 6 D 2 4 5 6 receptor cells

9 18 The diagram shows a section through the eye. When the person looks down and focuses on their mobile phone, what is the state of the structures P and R? P R A contracted slacken B contracted taut C relaxed slacken D relaxed taut

10 19 The diagram below shows some stages in cell division in a mouse (Mus musculus). Cell X contains 20 pairs of chromosomes. How many chromosomes are in cell Y and in cell Z? cell Y cell Z A 20 10 B 20 20 C 40 20 D 40 40 cell z