F3A,B,C,D &E Heep Yunn School Final Examination (2023 — 2024) Form Three Junior Science (Biology Question-Answer Book June, 2024 Time allowed: 60 minutes Total: 60 marks Name: Mca aig Class:_24_ (30) Instruction: ANSWER ALL QUESTIONS. You should mark your answers for Section A on the MC answer sheet provided. Section A: Multiple-Choice Questions (20 marks) 1. The table below lists the blood test results of three individuals for the presence of hepatitis virus and antibodies in their blood: Individual 1 Individual 2 Individual 3 Hepatitis B virus ‘Negative Positive y Negative Antibodies against J, 5 7 hepatitis B virus Negative Negative Positive Which individual(s) has/have just taken hepatitis B vaccine? A. B. ic D. 1 only 2only Land 3 only 2and 3 only 2. Humans must include protein in their diet because A. gos they do not have all the materials for producing protein. they cannot produce protein. they rely on protein to produce energy. protein protects internal organs from shock.Tn which of the following regions of the human alimentary canal will chemical digestion of protein occur? —~ (1) stomach” (@)_ pancreas 3) small intestine y A. (1) and (2) only B. (1) and (3) only C. (2)and (3) only D. (1), 2) and 3) Peter carried out an experiment to investigate the effect of an enzyme on boiled egg white. In the experiment, he prepared six small glass tubes of boiled egg white. He then put the glass tubes into test tubes with different solutions at a constant temperature of 37 °C. The following diagram shows the results after four hours: ‘water bath glass tube boiled egg white enzyme enzyme enzyme dilute dilute _istiled + dilute + dilue + distilled acid alkali water acid alkali water From which part of the digestive system is the enzyme secreted? A. mouth B. stomach Cc. liver D. pancreas Which of the following may be the consequence if a great length of the large intestine of a patient is removed? A. Dietary fibre cannot be digested. The patient may be deficient of some minerals as minerals are absorbed in the large intestin Xx B C. The patient may become thin as fewer nutrients are absorbed.» D. The faeces may become more watery.Directions: ns: Questions 6 and 7 refer to the diagram below, which shows part of the lower jaw of an adult: 6. Which of the following combinations correctly identify the types of the teeth shown? Q Ss T A. canine premolar molar B. canine molar molar c incisor premolar premolar D, incisor molar molar 7. Which of the following teeth is used for tearing food? A Q BOR Cas Dok 8. Which of the following statements about calcium in human body is correct? ‘A. Itrequires vitamin C to be absorbed in the intestines4 B. _ Deficiency in calcium can lead to anaemiay. C. _ Itis involved in blood clotting. D. _ It facilitates the absorption of phosphorus 9. Which of the following foods would provide the richest sourees of iron and vitamin A? A, Clive? and ilk B. “broccoli and bell pepper C. cereal and Garro¥) D. _ fish and lettuce 10. Vaceines for COVID-19 cannot offer 100% protection against the disease because ‘A. the pathogen causing COVID-19 changes rapidly. / B. the vaccines cannot stimulate our immune system. C. the body cannot produce antibodies to attack the pathogen in the vaccines D. _ new vaccines like mRNA vaccines are ineffective.1. 12, 13. In an experiment, catalase was added to hydrogen peroxide solution ina test tube. The tube was then incubated at a constant temperature. The graph below shows the rate of breakdown of hydrogen peroxide in the reaction mixture over time: 4 rate of breakdown of hydrogen| peroxide (arbitrary unit) 0 40 80 120 160 time (min) Which of the following can be deduced from the result? (1) _ In the first 40 minutes, hydrogen peroxide was being broken down./ (2) Oxygen escaped the test tube. (3) Heat produced in the reaction denatured all catalase at 120 minutes. A. (I)only B. Q)only C. (1)and 3) only D. Q)and (3) only Which of the following food substances cannot be stored in large amounts in the human body? (1) carbohydrates (2) lipids (3) proteins ¥ A. (only B. @)only C. (1)and 2) only D. (2)and (3) only Chocolate causes tooth decay more easily than sugary liquids because chocolate ‘A. contains more sugar than sugary liquids. B. c D. contains more bacteria than sugary liquids. is acidic. leaves debris sticking on the tooth surface more easily than sugary liquids.14. Which of the following statemen nts comectly describe(s) pathogens? (1) They make everyone sick. eee (2) They all cause diseases, / 8) Being infected by some of them can increase the risk of having cancer. A. (1) and (2) only B. (1)and(3) only C. (2) and 3) only D. (1), 2) and (3) 15. Proper weight management can reduce the risk of developing (1) type 1 diabetes. (2) cardiovascular diseases. / (3) colorectal cancer. / A. (1)and (2) only B. (1) and @3) only C. @)and (3) only D. (1), (2) and 3) 16. Which of the following statements about enzymes is/are correct? (1) No enzyme can work above 60°C. (2) Enzyme denatures in low temperature and low pHX (3) The Key in the lock-and-key hypothesis represents enzyme. J A. (only B. (3)only C. (I)and 2) only D. (2)and (3) only 17. Which of the following conditions inerease(s) one's risk of developing stroke? (1) Having a high-fat diet. (2) Being bom with a narrower blood vessel in the heart. \X (3) Pancreas unable to secrete lipase. % \X A. (only B. ()only c (1) and (2) only D. (2)and (3) only18, 19, 20. Care geet ‘The photograph below shows a health supplement designed for pregnant women: Pregnancy Care jupplement ¥ Extra iron v Extra calcium y Extra vitamins A, CandD Which of the following are the possible benefits of taking this supplement for pregnant women? (1) to replace the nutrients lost during menstruation % (2) to help with the healing process after giving birth (3) to provide nutrients for the formation of foetal haemoglobin Y A. (1)and Q) only B. (1)and@) only C. @)and (3) only D. (1), (2) and (3) In humans, the main functions of vegetables in a balanced diet are to supply (1) vitamins and minerals.” (2) energy. x (3) dietary fibre. y/ A. (I)and (2) only B. (1) and (3) only C. (2)and 3) only D. (1), 2)and (3) Given a solution containing starch, amylase, maltase and lipase, which of the following tests will give a negative result to this solution after 1 minute? A. iodinetest Pp B. Clinistix test C. Albustix test } D. DCPIP testScetion B: ructured juestions For ea ¥ each of the diseases listed in column 1, select from column 2 (40 marks) one statement that 5 ¥ escribes it, Put the appropriate letter in the space provided Column 1 (@) athlete's foot ww (b) cholera © alps aw) A polyp is a group of abnormal cells. They are usually an early symptom of colorectal cancer cervical cancer. The photograph below shows a polyp in the large intestine Colunm 2 A B c D It is transmitted by air. People with the disease may have diarrhoea, Itis caused by fungi t correctly (3 mark People with the disease should avoid sharing syringes. Smokers have higher risk of getting it (2 marks)b) @ a nour that is If the polyp is left untreated, it might develop into cancer. Name the tyPe of tur 1 mark) classified as cancer. i Malitnasat teat. 1 mark Suggest why it is is for males to devel (1 mark) signa, Achich mab de nd hae, Polyp can be easily removed by surgery. The diagram below shows the removal of a polyP in the large intestine using a special equipment called endoscope: Endoscope Snare Colon wall The special equipment is a camera attached to a long tube with a snare at the end that can cut off the polyp. The surgeon performing the surgery can reach the polyp in the large intestine by inserting the endoscope into the patient’s body through a natural opening. The natural opening could be the entry or the exit of the patient’s alimentary canal. (i) Name the location where the endoscope should be inserted for reaching the large intestine. (1 mark)(ii) With reference to the information below and the characteristics of eancess, explain why itis important to have regular body check G mais) Cancer survival by stage at diagnosis Proportion of people surviving ther cancer or five years ot mare Diagnosed a entiest tage od at atest tage ii) Suggest wo methods that the Government can adopt to reduce the number of deaths caused by cancer in Hong Kong. (2 marks)ia ‘Type 2 diabetes 2 diabetes accounts for between 85% and 95% of people with diabetes. Type 2 dial ram below shows the cl 2 diabetic person and in 3. Type ‘usually appears in people over the age of 40. The diag glucose concentration over two days in an untreated type ranges in blood a non-diabetic person. day 1 day 2 a F 18 16 14 12. unrated? blood glucose EEF ype 2 diabetic concentration 10: (mmol L“') a 6 4 SeSeSessessssegssssseesss ELIESSSK PSS ELSI ss ses PSears time (hour) (a) (i) State the range over which the blood glucose concentration varies in the untreated type 2 diabetic and the non-diabetic person over the two days (2 marks) 10je increase (ii) Suggest and explain why the blood glucose concentration of both peopl (2 marks) rapidly after 08:00, 12:00 and 18:00. dt is Le, ths 4, lrcakfast. (ltd at (2:90.10: 00 amd 18:0 fy aliea hb — \ Graded sg at ee ee I \ i reels Hale de of He, entration ace ee ype 2 ¥ (2 marks) (iii) As shown in the diagram, ‘the blood glucose cone diabetic is always higher than that of a non-diabetic person. Explain why. cence stl bth (b) The table ‘below shows the prevalence of type 2 diabetes between 1994 and 2001 in England: Goat Prevalence of type 2 diabetes (per 1000) To9a [1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 Female | 16 17 17 18 19. 20 21 ame | 7, Male 18 19 20 21 22 23 25 27 % (@) Using the information in the table, deseribe the trends in the prevalence of type 2 diabetes between 1994 and 2001. (3 marks)(Gi) Suggest three reasons for the trends described in (b)(i). 4, The table below shows some nutrition information about three types of milk: Whole milk Skimmed milk | High-calcium milk (per 100 cm?) (per 100 em?) (per 100 cm?) Protein 3.1g 35g 428 4 Total fat 3.52 03g 1S5¢ 4 Carbohydrate 458 53g 652 4 Dietary fibre 0g Og og Caleium 110mg 170 mg 170 mg Sodium 40mg 57mg 35mg (a) Given that 1 gram of protein provides 4 calories, calculate the amount of energy provided by one carton (350 em) of milk. Show your working, (2 marks) whale GixGt 2.5%9* 46 adie 7 218-55 ali | (b) Explain why skimmed milk is not suitable for babies. (2 marks)(©) Suggest one group of people who would be recommended to drink high-caleium milk, Explain your answer. (2 marks) (a) Describe how you would test for the presence of fat in milk. State the expected observation. (3 marks) I e 1 ook, seme if5. The diagram below shows the upper part of the human alimentary canal: (2) Structure A secretes digestive juice into the mouth cavity. Identify structure A. (1 mark) Dalla (b) With reference to the function of water in the body, describe the function of water in the digestive juice produced by structure A. (2 marks) St_ misters and alts the bol tr nuke st | a i em glace whee | the eadtion dah take plat:(©) As people get older, they may lose their teeth, How does losing their teeth affet the rate of (G marks) digestion in the mouth? Ate stulh couch the Dra ver —sonablac pleccs which End of Paper (adled fas.IE > ween ayer ene 0. Section B © © ) (©) @ Heep Yunn School Final Examination (2023 — 2024) Form Three Junior Science (Biology ‘Suggested Solution B WA A 12. &B B 3. ~D D 4. Cc D isc c 16. B B nA ¢ 18: °C. A 19. B A 20. D c 0) B @ D a If the mechanisms that control cell division fail, ay cells may divide in an uncontrolled way forming polyp. ay Malignant tumour qa) Male do not have cervix/female reproduction organ/vagina ay @) *Anus qa) (ii) Regular body check enable early diagnosis of cancer. qa ‘The chance of survival is higher/larger proportion of cancer patient survive when the condition is diagnosed at an carly stage. ay ‘The cancer can be treated/temoved before spreading, a (iii) Launch free/funded cancer screening programme. a Promote the importance of healthy lifestyle/regular body check. a) Increase public awareness on the disease through education (e.g. advertisement). (1) (any other reasonable methods) a) 16@ (6) @ (b) © (i) Untreated type 2 diabetic: 8-18 mmol L o Non-diabetie: 3-7 mmol L ® (i) They have just eaten a meaV/consumed food/ate breakfast, lunch and dinner. a Carbobydrate/glucose in food is absorbed into the blood in the small intestine. a) (iii) The body cells of a type 2 diabetic do not respond to insulin! a Their body cells take in less glucose./ a ‘Therefore the body cannot regulate the blood glucose level. a (any vo) (The prevalence increased in males and females/ @ ‘The increase was greater in males./ a ‘The increase was greater after 1998,/ a) ‘The prevalence was always higher in males than in females. q) (any three) (ji) More people lack physical activities/have a sedentary lifestyle./ @ More people were having unbalanced diet,/high lipid/low fibre dict./ q More people smoke./ a) People live longer./ a) People have greater awareness to diagnose the disease. a Female’s diet is more balanced when compared to male. q (other reasonable answers, any three) [G.lg + 4.5g)*4 + 3.5g*4*2}*(350/100) a 204.4 calories a Skimmed milk has a low fat content. a Babies need more fat for forming cell membranes during growth, G1) ‘The energy value of skimmed milk is too low. a ‘Skimmed milk cannot provide enough energy to support the metabolisms/activities of babies. Gy) (any set of 1+1) People with rickets/osteoporosis/pregnant woman/elderly people/children/teenager. (1) ‘They need more calcium to form bones/strengthen bones. w Add a drop of milk onto a piece of filter paper. qa) Allow the filter paper to air-dry. a Persist of translucent spot indicates the presence of fat. a)@ ©) *Salivary gland, w Water provide a medium for reaction. a For the breakdown of starch into maltose (by amylase)./ cH) Water is a (universal) solvent ay Soluble food substances can be dissolved for swallowing/easier absorption. cn Water moisten and lubricate the food. ay Makes the food easier to swallow. oy (any one set) Food cannot be chewed/mechanically digested by teeth into smaller pieces a Food is in larger pieces so the surface area is relatively small for amylase to work on. ay The rate of both mechanical and chemical digestion decrease. () 18