AES 2019 Bio Prelim P2 QP

Name: ....................................................... ( ) This Question Paper consists of 18 printed pages including this page. [Turn over ASSUMPTION ENGLISH SCHOOL PRELIMINARY EXAMINATION 2019 BIOLOGY 6093 / 02 ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL ASSUMPTION ENGLISH SCHOOL LEVEL: Sec 4 Express DATE: 3 September 2019 CLASS: Sec 4/2 DURATION: 1 hour 45 minutes Additional Materials provided: NIL INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your NAME and INDEX NUMBER at the top of this page. SECTION A (50 marks) STRUCTURED QUESTIONS Answer all questions in the spaces provided. SECTION B (30 marks) FREE RESPONSE QUESTIONS Answer three questions in this section in the spaces provided. Question 3 is in the form of an Either / Or question. Only one of the alternatives should be answered. For Examiner’s Use Paper 1 /40 Paper 2 Section A /50 Paper 2 Section B /30 Paper 3 /40 Total /160 Overall /100 www.KiasuExamPaper.com 20

2 6093/02/4E/PRELIMS/19 SECTION A – STRUCTURED QUESTIONS (50 marks) Answer ALL the questions in the spaces provided. 1 The figure below shows some chemical molecules found in the human body and how they are joined to form larger molecules. (a) Identify molecules P, Q, R and S. P: …………………………………… Q: …………………………………… R: …………………………………… S: …………………………………… [2] (b) (i) State a test that a student can use to test for the presence of S in a liquid sample of food. ……………………………………………………………………………… [1] (ii) Describe how this test is carried out and the observations that can confirm the presence of S in the food. ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… …………………………………………………………………………….... [2] Q R S P www.KiasuExamPaper.com 21

3 6093/02/4E/PRELIMS/19 [Turn Over 2 The figure shows a potted plant with an outer ring of bark removed at point X. Leaf K is enclosed within a bottle containing carbon dioxide with radi oactive carbon. The soil was watered with a solution containing radioac tive phosphate ions. The entire plant was exposed to sunlight for 6 hours. (a) Which tissue of the vascular bundle is removed at point X? ...................................................................................................................... [1] (b) Which labelled part(s) J, K, L and / or M will be tested positive for radioactive sugar? Explain your answer. ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... [4] g radioactive carbon dioxide air containing Soil solution containing radioactive phosphate ions J K L M X www.KiasuExamPaper.com 22

4 6093/02/4E/PRELIMS/19 (c) Which labelled part(s) J, K, L and / or M will be tested positive for radioactive phosphate ions? Explain your answer. ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... ...................................................................................................................... [3] 3 The diagram shows a section through a small surface wound to the skin. (a) Name cell O and the type of blood vessel P shown in the diagram. O: ........................................... P: ........................................... [2] www.KiasuExamPaper.com 23

5 6093/02/4E/PRELIMS/19 [Turn Over (b) Explain what is happening to the bacteria at M and N. M: ………………....……………………………...................………………….. .…………….……………………………………...................………………….. N: ………………....……………………………...................………………….. .…………….……………………………………...................………………….. [2] (c) Explain how the wound is being sealed in the region under the scab. .................................................................................................................... .................................................................................................................... .................................................................................................................... .................................................................................................................... .................................................................................................................... [2] (d) (i) Complete the table by circling the changes in concentration of glucose and oxygen after passing through blood vessel P. substance concentration after passing through P glucose higher / lower / remain the same oxygen higher / lower / remain the same [1] (ii) Explain the changes in the concentration of oxygen and glucose, if any, in part (d)(i). ............................................................................................................. ............................................................................................................. ............................................................................................................. [2] www.KiasuExamPaper.com 24

6 6093/02/4E/PRELIMS/19 4 The figure shows a section of a pancreas, as seen using a light microscope. (a) (i) Name one soluble protein which can be found in the main duct af ter a meal. ............................................................................................................ [1] (ii) State the organ in which the main duct empties its contents into. …………………………………………………….................…………… [1] (b) (i) State the substance that will be released by the islets of Langerhans into the blood vessel after a meal. ............................................................................................................ [1] (ii) Explain how the substance identified in (b)(i) helps to regulate blood glucose concentration. ............................................................................................................ ............................................................................................................ ................................