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photosynthesis IGCSE

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photosynthesis IGCSE

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  1. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Photosynthesis Question Paper 3 Level Subject Exam Board Topic Sub-Topic Booklet GCSE Biology CCEA Photosynthesis and plants Photosynthesis Question Paper Time Allowed: 71 minutes Score: /59 Percentage: /100

  2. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ Higher Tier 1

  3. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 1 The diagram shows part of a cross section of a leaf viewed through a microscope. A B nucleus C air space lower epidermis D X © GCSE Biology for CCEA, 2nd Edition by James Napier. Published by Hodder Education in 2011. ISBN: 9780340983805. Reproduced by permission of Hodder Education (a) Name layers A, B, C and cell D. A _________________________ [1] B _________________________ [1] C _________________________ [1] D _________________________ [1] 2

  4. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (b) Suggest why there is no nucleus visible in cell X. _______________________________________________________________ _____________________________________________________________ [1] (c) Layer C is adapted for gas exchange. Give one adaptation visible in the diagram. _______________________________________________________________ _____________________________________________________________ [1] (d) Use the diagram to describe two ways the cells in layer B are better adapted for absorbing light than the cells in layer C. 1. _____________________________________________________________ _______________________________________________________________ 2. _____________________________________________________________ _____________________________________________________________ [2] 3

  5. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 2 (a) The apparatus shown was used by a group of students to investigate how light intensity affects the rate of photosynthesis. bubbles © Copyright D G Mackean www.biology-resources.com (i) Name the gas collecting in the test tube. [1] (ii) Describe how this apparatus can be used to measure the rate of photosynthesis. [2] (iii) Describe one way the students could have increased the light intensity. [1] 4

  6. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (iv) Give one disadvantage of this way of changing the light intensity and describe how it can be overcome. [2] (b) The line graph shows the results of this investigation. 40 35 Rate of photosynthesis/arbitrary units 30 25 20 15 10 5 0 0 1 2 3 4 5 6 7 8 9 10 11 12 Light intensity/arbitrary units The investigation was repeated with sodium hydrogencarbonate added to the water to provide additional carbon dioxide. (i) On the graph sketch a line to show the results of the investigation with additional carbon dioxide provided. [2] (ii) What is the limiting factor between 0 and 5 arbitrary units of light intensity? [1] 5

  7. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ The diagram shows some of the features of a commercial greenhouse used by a market gardener to grow tomatoes. ventilator temperature sensor light sprinkler carbon dioxide sensor oil burner light sensor tomato plants © Barking Dog Art 6

  8. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (c) Use evidence from the diagram to help describe how this greenhouse environment is controlled and explain why it may help the market gardener to make more profit. In this question, you will be assessed on your written communication skills, including the use of specialist scientific terms. [6] 7

  9. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 3 The diagram shows part of a leaf. cuticle A C B © GCSE Biology for CCEA by R McIlwaine & J Napier, published by Hodder & Stoughton, 2003. ISBN 0340858257.”Reproduced by permission of Hodder Education”. (a) Name cells A, B and C. A [1] B [1] C [1] (b) Explain how the cuticle is adapted to allow light to reach the mesophyll cells. [1] 8

  10. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 4 The diagram shows part of a leaf. upper epidermis A B C © Biology GCSE by G & M Jones, published by Cambridge University Press, 1984. ISBN 0521285321 ? (a) (i) Name parts A, B and C. A [1] B [1] C [1] 9

  11. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (ii) Use the diagram to help complete the table. Leaf adaptation How it increases photosynthesis Transparent upper epidermis [1] Short distance for gases to diffuse [1] Flat leaf [1] The drawing shows a magnified section of leaf epidermis. nucleus surrounding cells guard cell X Y chloroplast 0 10 Scale in arbitrary units 20 30 (iii) Use the scale to measure the diameter of the opening along the line X–Y. 10 Diameter arbitrary units [1]

  12. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ The size and shape of guard cells differ from the surrounding cells. (iv) Give two other ways guard cells differ from the surrounding cells. [2] (v) Describe how a named raw material used in photosynthesis enters the leaf. The quality of written communication will be assessed in this question. [3] Quality of written communication [2] 11

  13. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ (b) The flow diagram shows the steps taken to test a leaf to find out if photosynthesis has taken place. Placed on a white tile and covered in iodine solution Step 4 Dipped into boiling water for 1 minute ➡ Boiled in alcohol ➡ ➡ Step 1 Step 2 Step 3 (i) Explain the purpose of Examiner Only Marks Remark Step 1. [1] Step 2. [1] (ii) Describe one safety precaution necessary when carrying out Step 2. [1] (iii) Complete the box in the diagram to describe what happens in Step 3. [1] (iv) Name the product tested for in Step 4, which would show that photosynthesis had taken place and describe the colour change observed in the iodine solution. Product [1] Colour change [1] 12

  14. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ A plant was left in the dark for 48 hours and one of its leaves was tested to find out if photosynthesis had taken place. (v) Explain why the iodine solution showed no colour change. [2] 5 (a) ?omplete the word e?uation for photosynthesis? Light energy Carbon dioxide + Oxygen + ??? (b) ?ame one mineral re?uired ?y plants and gi?e its use? ????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????? ?????????????????????????????????????????????????????? ??? 13

  15. Save My Exams! – The Home of Revision For more awesome GCSE and A level resources, visit us at www.savemyexams.co.uk/ 6 T?e dia?ra? s?ows a section t?rou?? a leaf? ? ?al??ade cell ? ? © Biology GCSE by G & M Jones, published by Cambridge University Press, 1984. ISBN 0521285321 ?a? ?a?e parts ?? ? and ?? ? ???????????????????????????????? ??? ? ???????????????????????????????? ??? ? ???????????????????????????????? ??? ??? ?escri?e ?ow t?e palisade cell is adapted for its function? ????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????? 14 ?????????????????????????????????????????????????????? ???

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