Sec 4 Science Biology SA2 2018 Admiralty QP

21 The diagrams below show four different types of cells. Which cel l does not contain cytoplasm? 22 The table below shows the comparison between a red blood cell a nd a root hair cell. feature number feature red blood ce ll root hair cell 1 transport oxygen yes yes 2 cytoplasm present no yes 3 large surface area to volume ratio yes yes 4 nucleus present no yes Which comparisons are correct? A 1, 2 and 3 B 2, 3 and 4 C 1 and 2 only D 3 and 4 only A B C D 2018 Sec 4 Science Biology - Admiralty www.KiasuExamPaper.com 3

23 Which diagram illustrates the process of active transport? 24 A student is tasked to determine if a food sample contains carbohydrates. Which of the following food test(s) should he carry out? I Benedict’s test II Biuret test III Ethanol-emulsion test IV Iodine test A I only B I and II only C I and IV only D II and III only A B C D www.KiasuExamPaper.com 4

25 A dish is filled with agar jel ly containing egg white. Four h oles are cut in the jelly and each is filled with the substances shown. Which hole will be surrounded by the largest egg white free region after 30 minutes? 26 The digestion of starch allows nutrients to be ____________________. A absorbed into the blood. B converted into amino acids. C ingested at the mouth. D moved along the alimentary canal. 27 The diagram refers to some substances found in plant cells. Which area of the diagram represents the end products of photosynthesis? distilled water pepsin solution and sodium solution pepsin solution and hydrochloric acid boiled pepsin solution agar jelly www.KiasuExamPaper.com 5

28 The diagram below shows a section through a stem. Samples of the contents of structure Q were tested. Which results are expected? Key + denotes positive results denotes negative results 29 The diagram below shows the transverse section of a mammalian heart. Which valves will open and close during ventricular contractions? Benedict’s reagent Iodine solution A ++ B +- C -+ D -- open close A E and F F and H B E and G F and G C F and G E and F D F and H E and G Q G E H F www.KiasuExamPaper.com 6

30 The diagram shows an alveolus and an associated blood capillary . At which point will the greatest rate of diffusion of carbon dioxide occur? 31 A girl stands 10 metres away from a sign and can see it clearly. She walks towards the sign and stops 0.5 metres from it. Which changes oc cur in her eyes so that the sign is still in focus? ciliary muscles suspensory ligament lens becomes results in light rays refracted A contract slacken thicker more B contract tighten thinner less C relax slacken thinner less D relax tighten thicker more C D linked to pulmonary vein capillary CA linked to pulmonary artery B www.KiasuExamPaper.com 7

32 The diagram below shows how nerve impulses are transmitted alon g three neurons. If a nerve block is administered at point X, how would the pers on respond to touching a hot object? A He experiences pain and withdraws his hand from the hot iron involuntarily. B He experiences pain but does not withdraw his hand from the hot iron. C He does not experience pain an d does not withdraw his hand from the hot iron. D He does not experience pain but withdraws his hand from the hot iron involuntarily. 33 Which of the following statements about flowering plants is correct? A Fertilisation can take place without pollination. B Pollination and fertilisation are the same. C Pollination and fertilisation must occur at the same time. D Pollination can take place without fertilisation X www.KiasuExamPaper.com 8

34 The diagram shows how blood glucose is controlled in human. Based on the diagram above, a lack of hormone Y would mean that A blood glucose levels cannot rise back to normal after a period of low glucose levels. B blood glucose levels will always be high. C hormone X will never be produced. D levels of stored glycogen will be high. 35 Which of the following shows the correct pathway which a sperm travels upon entering the female body? A ovaryÆ urethraÆ vagina B ovaryÆ vaginaÆ uterus C vaginaÆ oviductÆ uterus D vaginaÆ uterusÆ oviduct Blood glucose concentration decreases Blood glucose concentration increases Hormone X secreted Hormone Y secreted www.KiasuExamPaper.com 9

36 Which statement is always true of dominant alleles? A They cannot undergo mutation. B They give a greater chance of survival than recessive allele. C The give the same phenotype in heterozygotes and homozygotes. D They occur more frequently in the population than recessive alleles. 37 The diagram below shows the structure of a DNA molecule. Which one of the structures represents the sugar-phosphate backbone? 38 Sickle cell anaemia is a recessive condition. Which person has two alleles for sickle cell anaemia? A B C D A B C D key male with sickle cell anaemia female with sickle cell anaemia male without sickle cell anaemia female without sickle cell anaemia www.KiasuExamPaper.com 10

39 Sewage accidentally enters a river for several days. What are the changes to concentration of oxygen, the number of bacteria and the number of fishes? 40 The graph shows the quantities of pesticide that accumulate in four populations, A, B, C and D, each at different trophic levels in a food chain. Which population is most likely to be herbivores? END OF PAPER concentration of oxygen number of bacteria number of fishes A decreases decreases increases B decreases increases decreases C increases decreases decreases D increases increases increases A B C D www.KiasuExamPaper.com 11

This question paper consists of 13 printed pages including this cover page. ADMIRALTY SECONDARY SCHOOL SUBJECT : Science (Biology) CODE/PAPER : 5078/04 LEVEL/STREAM : Secondar y 4 Express/ 5 Academic DATE : 20th August 2018 TIME : 0800h – 0915h DURATION : 1 hour 15 minutes Instructions to candidates: Write your name, index number and class on the cover page. Write in dark blue or black pen. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer any two questions. Write your answers on the lined pages provided. The number of marks is given in brackets [ ] at the end of each question or part question. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. DO NOT TURN OVER THIS PAPER UNTIL YOU ARE TOLD TO DO SO. PRELIMINARY EXAMINATION 2018 For Examiner’s Use Section A Section B Total NAME: NO: CLASS: www.KiasuExamPaper.com 12