Broadrick 2019 Bio Prelim P2 QP

1 This question paper consists of 19 printed pages including this page. [Turn over Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2019 BIOLOGY Paper 2 Theory Candidates answer on the Question Paper No Additional Materials are required. 6093/02 Sep 2019 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your name, index number and class on the work you hand in. You may use an HB pencil for any diagrams, graphs, tables or rough working. Write in dark blue or black pen. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Section B Answer all the questions. Question 9 is an Either/Or question. Write your answers in the spaces provided on the Question Paper. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. 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. For examiner’s use P2 / 80 www.KiasuExamPaper.com 166

2 6093/2/9/19 [Turn over] Section A (50 marks) Answer all the questions in the space provided. 1( a ) Define the term translocation. [2] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. (b) The figure below shows a scanning electron micrograph of a type of vascular tissue found in plants. Fig 1.1 www.KiasuExamPaper.com 167

3 6093/2/9/19 [Turn over] (i) Name the vascular tissue. [1] ………………………………………………………………………………………….. (ii) With reference to Fig. 1.1, describe two ways that these vascular tissues are adapted to their functions. [2] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. (c) Some weedkillers stop the plant from photosynthesising. These a re often applied to the soil where the weeds are growing. Explain how the weedkiller reaches its site of action in the leaves. [4] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [Total:9m] 2( a ) State what is meant by the term ‘activation energy’. [1] ………………………………………………………………………………………….. ………………………………………………………………………………………….. www.KiasuExamPaper.com 168

4 6093/2/9/19 [Turn over] (b) Fig 2.1 shows a section of photographic film. The top layer is made of silver particles embedded in a layer of gelatine which is a type of protein. Fig 2.1 In an investigation, a 20 mm length of photographic film was placed in each of three boiling tubes. x The film was immersed in 20cm3 water. x 1 cm3 of liquid at different pH values was added to the boiling tubes. x 1 cm3 of protease solution was added to each boiling tube. x Each boiling tube was shaken gently to mix the contents. x Each boiling tube was kept at 370C for 1 hour. Fig 2.2 shows the apparatus and the results of the investigation. Fig 2.2 gelatine layer with silver particles backing layer silver particles in suspension backing layer boiling tube 1 1cm3 of liquid at pH 2 added. boiling tube 2 1cm3 of liquid at pH 7 added boiling tube 3 1cm3 of liquid at pH 10 added www.KiasuExamPaper.com 169

5 6093/2/9/19 [Turn over] (i) Explain the difference in results obtained between boiling tube 1 and boiling tubes 2 and 3. [3] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. (c) Carbon dioxide is released during respiration in all living cel ls in the human body. Describe the role of carbonic anhydrase in the excretion of car bon dioxide from the lun gs. [3] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [Total:7m] www.KiasuExamPaper.com 170

6 6093/2/9/19 [Turn over] 3 The figure below shows the relationship between air temperature and the body temperature of an insect. Fig. 3.1 (a) State the change in the body temperature of the insect as air t emperature changes from 160C to 400C, as shown in Fig 3.1 [1] ………………………………………………………………………………………….. (b) State two conclusions which may be drawn from Fig 3.1. [2] 1 : .………………………………………………………………………………………. …………………………………………………………………………………………… 2 :………………………………………………………………………………………… ……………………………………………………………………………………………. (c) S k e t c h a l i n e o n F i g 3 . 1 t o s h o w t h e b o d y t e m p e r a t u r e o f a n a d ult human between air temperatures of 20 0C and 360C. Show answer on the graph of Fig. 3.1. [2] body temperature/0C air temperature / 0C www.KiasuExamPaper.com 171

7 6093/2/9/19 [Turn over] (d) Describe the role of insulin in regulating blood glucose concentration in the human body. [3] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [Total:8m] 4( a ) Define the term excretion and explain its importance. [2] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. (b) Fig 4.1 shows a kidney tubule and its blood supply. Fig 4.1 (i) Name the structure labelled Z on Fig 4.1. ………………………………………………………………………………………….. [1] www.KiasuExamPaper.com 172

8 6093/2/9/19 [Turn over] (ii) Using an ‘A’, indicate on the structure(s) in Fig 4.1, where the anti-diure tic hormone (ADH) act(s) on during homeostasis. [1] (c) Table 4.1 below shows the composition of a liquid taken from pa rt X and W of the kidney nephron above. substance composition/ g per 100cm3 XW glucose 0.100 urea 0.100 0.500 Table 4.1 (i) Complete Table 4.1 to show the glucose content at region W. [1] (ii) Explain your answer to c(i). ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [2] (iii) Explain the difference in the urea concentration between regions X and W. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [2] (d) Anti-diuretic hormone (ADH) is involved in the prevention of dehydration. Explain how ADH reduces water loss from the body. [3] ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [Total:12m] www.KiasuExamPaper.com 173

9 6093/2/9/19 [Turn over] 5 Fig 5.1. shows the transfer of energy through a food web in a pond ecosystem. Fig. 5.1 (a) State the process that converts the energy from sunlight into carbohydrates. [1] ………………………………………………………………………………………….. (b) Calculate the percentage of energy from sunlight that was event ually fixed into carbohydrates. Show your working. ………………………………….. % [2] (c) Calculate the amount of energy in the pond plants that remained unconsumed by herbivores. Show your working. ………………………………….. kJ [2] 6 400 000 kJ (reached the pond) energy level 1 energy level 2 energy level 3 32 000 kJ (fixed in carbohydrates by pon