SJI 2020 Y3 EOY Biology 6093 P1

[Turn over] ST JOSEPH’S INSTITUTION END-OF-YEAR EXAMINATION 2020 (YEAR 3) CANDIDATE NAME CLASS INDEX NUMBER BIOLOGY Paper 1 Additional Materials : Multiple Choice Answer Sheet 6093/01 7 October 2020 45 minutes (09:45 – 10:30) READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided. There are thirty questions on this 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 choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. The use of approved scientific calculator is expected, where appropriate. At the end of the exam paper, hand in yo ur Question Paper and Multiple Choice Answer Sheet separately. This document consists of 17 printed pages including this cover page. For Examiner’s Use Total / 30

2 [Turn over] 1 Which substance(s) is / are not produced at the ribosomes? 1 amino acids 2 amylase 3 glycerol A 3 only B 1 and 2 C 1 and 3 D 2 and 3 2 The diagram below shows four different cells. Which cells are adapted to increase surface-area-to-volume ratio? A 1 and 2 B 1 and 4 C 2 and 4 D 3 and 4 3 The diagram shows molecules of glucose and water in a solution inside a petri dish . Glucose was added to water at Z. Which of the following takes place after the addition of glucose at Z? A active transport only B diffusion only C osmosis only D diffusion and osmosis

3 [Turn over] 4 The diagram shows a permeable tubing filled with salt solution in a test-tube of water. Which graph shows the changes in salt concentration inside and outside of the tubing after 24 hours?

4 [Turn over] 5 The table shows the results of an analysis of the cell sap from a marine plant, Valonia utricularis, and the surrounding sea water. substance analyzed ionic concentration (mg/l) sodium chloride potassium cell sap 0.11 0.62 0.50 sea water 0.49 0.58 0.01 The data suggests that the marine plant 1 removes sodium ions by active transport. 2 removes chloride ions by diffusion. 3 accumulates sodium ions by active transport. 4 accumulates potassium ions by active transport. Which of the above statements are correct? A 1, 2 and 3 only B 1, 2 and 4 only C 1, 3 and 4 only D 2, 3 and 4 only 6 The diagram shows macromolecules P, Q and R. Which of the following statements is true? A P is an enzyme. B P and Q are made up of the same elements. C R contains the nitrogen element. D R is made up of glucose.

5 [Turn over] 7 By which process are complex molecules produced from simple molecules? A deamination B detoxification C photosynthesis D respiration 8 The bar charts show the percentages (%) of fat, protein, starch and sugar in four different types of food. Which of the following is milk?

6 [Turn over] 9 The graph below shows the energy level during the breakdown of hydrogen peroxide into water and oxygen, in the presence and absence of an enzyme, catalase. Which of the arrows indicates the difference in activation energy of the reaction when the catalase is present as compared to when it is absent? 10 The diagram shows an enzyme action by sucrase. Stage 1 Stage 2 Stage 3 If Benedict’s test and biuret test are carried out at Stage 3 of this enzyme action, what will be the correct observations for the food tests? Benedict’s test biuret test A blue pale blue B blue violet C brick-red precipitate pale blue D brick-red precipitate violet

7 [Turn over] 11 Which of the following bar charts shows the amount of starch digestion in the mouth, stomach and small intestine?

8 [Turn over] 12 The contents of four test-tubes were set up and incubated at temperatures as shown in the diagram below. A few drops of bromothymol blue indicator were added to each test-tube. The indicator is blue in alkalis and yellow in acids. In which test-tube would the blue indicator turn yellow first? 13 Which molecules from food are absorbed at the villi into the blood capillaries? A amino acids, fructose, water B galactose, glucose, fatty acids C glycerol, polypeptide, water D maltose, amino acids, fatty acids

9 [Turn over] 14 The diagram shows part of the digestive system. Which organ produces glucagon and in which organ does glucagon have its effect? glucagon produced in glucagon has its effect on A 1 1 B 1 2 C 2 1 D 2 2 15 The diagram shows the apparatus used to investigate the factors required for photosynthesis to occur. Which label indicates a waste product in this process?

10 [Turn over] 16 The photomicrograph shows a section of the spongy mesophyll and the lower epidermal tissue of a leaf. At which point, A, B, C or D, will the concentration of carbon dioxide be the lowest when the plant is exposed to a high light intensity? 17 An experiment was conducted in which Elodea in pond water was exposed to differ ent light intensities. The rate of photosynthesis was recorded and the results are shown in the graph below. rate of photosynthesis L light intensity The following are four limiting factors in the biological processes in the Elodea. 1 light intensity 2 carbon dioxide concentration in the water 3 temperature of the water 4 oxygen content of the water Out of the four limiting factors, which two are able to limit the rate of photosynthesis at light intensities greater than L? A 1 and 2 B 1 and 3 C 2 and 3 D 2 and 4 A D C B