GCSE Additional Applied Science Jan 2008 Agriculture & Food Paper B

This document consists of 9 printed pages and 3 blank pages. SP (CM/CGW) T50816/3 © OCR 2008 OCR is an exempt Charity [Turn over INSTRUCTIONS TO CANDIDATES • Write your name in capital letters, your Centre Number and Candidate Number in the boxes above. • Use blue or black ink. Pencil may be used for graphs and diagrams only. • Read each question carefully and make sure that you know what you have to do before starting your answer. • Answer all the questions. • Do not write in the bar codes. • Do not write outside the box bordering each page. • Write your answer to each question in the space provided. INFORMATION FOR CANDIDATES • The number of marks for each question is given in brackets [ ] at the end of each question or part question. • The total number of marks for this paper is 36. FOR EXAMINER’S USE Qu. Max. Mark 1 6 2 8 3 10 4 12 TOTAL 36 GENERAL CERTIFICATE OF SECONDARY EDUCATION A334/02 TWENTY FIRST CENTURY SCIENCE ADDITIONAL APPLIED SCIENCE A Agriculture and Food (Higher Tier) FRIDAY 18 JANUARY 2008 Afternoon Time: 45 minutes Candidates answer on the question paper. Additional materials (enclosed): None Calculators may be used. Additional materials: Pencil Ruler (cm/mm) H * C U P /T 5 0 8 1 6 *2 © OCR 2008 1 (a) There are many different types of cheese. The food production chain of cheese has four main steps. Complete the boxes by writing in the correct name of each step. The first one has been done for you. cheese production steps in food production chain Cows produce milk 1. growing/producing Milk collected by refrigerated tanker The creamery makes milk into cheese Cheese is left to mature [3] (b) A factory inspector visits the creamery. Suggest a reason for his visit. .................................................................................................................................................. ..............................................................................................................................................[1] (c) Name an organisation that supports a food product and explain the role of the organisation. name ......................................................................................................................................... explanation ............................................................................................................................... .................................................................................................................................................. ..............................................................................................................................................[2] [Total: 6]3 [Turn over © OCR 2008 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE4 © OCR 2008 2 Joe grows tomato plants. He grows five plants in his garden and five plants in his greenhouse. He plants the same type of tomato plant. He weighs the tomato crop. (a) He gets 0.5 kg of tomatoes from each plant grown in his garden. (i) What is the total mass of his garden crop of tomatoes? Show your working. .......................................................kg [1] (ii) Joe’s total crop from his greenhouse tomato plants is 20 kg. What is the average weight of tomatoes from one plant? Show your working. .......................................................kg [1] (iii) Joe gets a better crop from his greenhouse tomato plants than from his garden tomato plants. Suggest two reasons why. 1 ........................................................................................................................................ 2 ....................................................................................................................................[2] (b) His outdoor tomato plants have yellowish leaves. He tests what is wrong by looking this up in a book. He finds out that they need more magnesium. YELLOWING BETWEEN VEINS MAGNESIUM DEFICIENCY (i) What type of test is Joe using? Put a tick (✓) in the correct box. qualitative semi-quantitative quantitative [1]5 [Turn over © OCR 2008 (ii) His greenhouse tomato plants have whitefly under their leaves. GREENHOUSE WHITEFLY Joe could use a chemical or a predator organism to control these whitefly pests. Write down one advantage of each type of control. using a chemical ................................................................................................................ .......................................................................................................................................... using a predator ................................................................................................................. ......................................................................................................................................[2] (iii) He uses the internet to search for a predator organism to kill the whitefly. What is the best word to type into his search engine? Put a ring around the best word. biocontrol biofl y bionet bioorganism bioplant [1] [Total: 8]6 © OCR 2008 3 Cultivated banana plants do not produce seeds. They are propagated by taking cuttings or by tissue culture. The diagram shows the stages in tissue culture. 1. Small pieces are taken from the plant. 2. Plant tissue is put in a sterile nutrient medium. 3. A clump of cells develops. 4. The cells develop into a small plant. 5. The plant is grown in soil in a controlled environment until ready for outdoor planting.7 [Turn over © OCR 2008 (a) (i) Why must the nutrient medium in stage 2 be sterile? ......................................................................................................................................[1] (ii) What can be added to the nutrient to make the clump of cells develop into a plant? ......................................................................................................................................[1] (b) Suggest two conditions that need to be controlled in stage 5 to produce the best growth. 1 ................................................................................................................................................ 2 ............................................................................................................................................[2] (c) Describe the commercial advantages of producing plants by tissue culture. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ..............................................................................................................................................[3] (d) Plants can also be produced by taking cuttings. (i) Describe how plant cuttings are taken and used to grow new plants. .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2] (ii) Write down one advantage of using cuttings instead of tissue culture to grow new plants. .......................................................................................................................................... ......................................................................................................................................[1] [Total: 10]8 © OCR 2008 4 Alex has work experience in a factory producing medicines. She is working in the section producing the antibiotic penicillin. A microorganism called Penicillium produces the antibiotic penicillin. The microorganism is grown in a fermenter. Look at the diagram of the fermenter. cooling water stirrer monitor monitor acid/base inlet antibiotic outlet gas outlet cooling water out nutrient inlet sterile air inlet (a) It is necessary to cool the fermenter as the temperature rises during fermentation. (i) Why does the temperature rise? ......................................................................................................................................[1] (ii) Explain why the temperature needs to be controlled. .......................................................................................................................................... ......................................................................................................................................[2] (iii) What is the reason for stirring the mixture? .......................................................................................................................................... ......................................................................................................................................[1] (b) Alex monitors conditions in the fermenter. Name two conditions, other than temperature, that must be monitored during the process. 1 ................................................................................................................................................ 2 ............................................................................................................................................[2]9 © OCR 2008 (c) After eight days Alex empties the fermenter. The contents are processed to extract the penicillin. The fermenter is cleaned and sterilised before the process is repeated. (i) Put a ring around the phrase or word which best describes how the fermenter was used. batch culture bio-reactor continuous culture respirometer [1] (ii) Explain why the fermenter must be sterilised before it is reused. .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2] (d) Alex draws a graph to show microorganism growth and antibiotic production over an eight-day time period. 1 2 3 4 time (days) X production (arbitrary units) 5 antibiotic microorganism growth 6 7 8 Explain the shape of the growth curve at X. .................................................................................................................................................. .................................................................................................................................................. ..............................................................................................................................................[3] [Total: 12] END OF QUESTION PAPER10 © OCR 2008 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE11 © OCR 2008 BLANK PAGE PLEASE DO NOT WRITE ON THIS PAGE12 © OCR 2008 Copyright Acknowledgements: Q.4 diagram Adapted from www.biotopics.co.uk © Richard Steane. Reproduced by permission of Richard Steane. Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (OCR) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. OCR is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.