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Biology CCEA GCSE Workbook

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Biology CCEA GCSE Workbook
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  UNIT 1 Cells, living processes and biodiversity   © James Napier 2018 1 Hodder Education WORKBOOK ANSWERS CCEA GCSE Biology   Unit 1: Cells, living processes and biodiversity   Unit 2: Body systems, genetics, microorganisms and health This Answers document provides suggestions for some of the possible answers that might be given for the questions asked in the Workbook. They are not exhaustive and other answers may be acceptable, but they are intended as a guide to give teachers and students feedback. Exam-style question (QWC) answers Some of the exam-style questions assess quality of written communication (QWC) and have what are referred to as banded mark schemes. T he ‘bands’ are linked to the marking of ‘indicative points’ which  show the content that examiners will be looking for. The number of indicative points in your answer will determine the band to which it will be allocated. QWC then determines the actual mark awarded within that band. The table below shows a typical banded mark scheme and how the 6 marks in a QWC question would be allocated. Band Response Marks A The candidate selects at least X (number X is dependent on the question) of the indicative points. The relevant material is organised with a high degree of clarity and coherence. There is widespread and accurate use of specialist vocabulary. Presentation, spelling, punctuation and grammar are of a sufficiently high standard to make the meaning clear. 5  – 6 B The candidate selects at least   Y (number Y is lower than X but dependent on the individual question)   of the indicative points. The relevant material is organised with some degree of clarity and coherence. There is some use of specialist vocabulary. Presentation, spelling, punctuation and grammar are of a sufficiently competent standard to make the meaning clear. 3  – 4 C The candidate selects at least Z (number Z is lower than Y but dependent on the individual question)   of the indicative points. The organisation may lack clarity and coherence. There is little use of specialist vocabulary. Presentation, spelling, punctuation and grammar may be such that the meaning is not clear. 1  – 2 D Response not worthy of credit. 0  UNIT 1 Cells, living processes and biodiversity   © James Napier 2018 2 Hodder Education Unit 1: Cells, living processes and biodiversity Cells Cells and microscopy 1 a   i Plasmid [1] ii Cell membrane/cytoplasm [1] iii  Any   two   from:    Plant and animal cells do not have plasmids.    Plant and animal cells have a nucleus/nuclear membrane.    Plant and animal cells have mitochondria. [2] b Electron microscopes have a greater resolution [1], allowing us to see structures we were previously not aware of/see the internal cell structures in greater detail. [1] [6 marks] 2 a Unit Symbol Number per metre in standard form Millimetre [1] mm [1] 1 × 10 3  Micrometre μ m 1 × 10 6  [1] b Cell measured as 5 cm [1] = 50   000 μ m [1] 50   000/5 = 10   000 [1] (Magnification = ×10   000)  UNIT 1 Cells, living processes and biodiversity   © James Napier 2018 3 Hodder Education It is very important that you show your working when told to do so in a question. If you make a mistake, and you do not show your working, you will get no marks even if the mistake is in the final stage of the calculation. [6 marks] Stem cells, cell specialisation and diffusion 3   a  A cell that can divide and produce different types of cell. [1] b In meristems at the tips/apices [1] of both shoots and roots. [1] [3 marks] 4 a Level of organisation Description Tissue [1] Group of similar cells with same general structure and function Organ system Organs are organised into organ systems, with each organ having a function relating to the overall function of the system [1] Organ [1] Structure made of several types of tissue that carries out a particular function b i It decreases [1] ii  As size increases, the surface area across which substances can diffuse decreases proportionally. [1] Eventually, there is not enough body surface across which gases can diffuse. [1] Specialised gas exchange surfaces increase the area across which the gases can diffuse (to compensate). [1] [7 marks] Exam-style questions 1   a Site of cell respiration/release energy [1] b There is a greater concentration of carbon dioxide inside the cell than outside. [1] This is due to the cell respiring (and producing carbon dioxide). [1] c Cytoplasm [1]; cell membrane [1] d Higher temperature [1]; higher concentration gradient [1] The question asks for factors that will increase  the rate of diffusion. Therefore, 'higher temperature' would get a mark but 'temperature' would not. [7 marks]  UNIT 1 Cells, living processes and biodiversity   © James Napier 2018 4 Hodder Education 2 a   i People with leukaemia often have a shortage of certain blood types. [1] This is due to the disease/pre-treatment damaging the bone marrow that produces these cells. [1] ii  All the types of blood cell [1] iii Bone marrow/blood [1] iv To prevent the body’s immune sys tem attacking the donated cells/to prevent rejection [1] b Embryonic stem cells can produce a wide range of cell types/any of the types of cell found in the body. [1] (Adult) stem cells/the cells used to treat leukaemia can only   produce blood cells. [1] c 45 mm = 45 000 µm [1] 45 000/600 [1] = 75 µm [1] [10 marks] Photosynthesis and plants Photosynthesis 1 a   i carbon dioxide + water [1] →  glucose + oxygen [1] ii 6CO 2  + 6H 2 O [1] C 6 H 12 O 6  [1] + 6O 2 b Photosynthesis is a process that takes place only in the presence of light [1] energy [1]. [6 marks] 2 a Leaves are destarched to ensure that they contain no starch at the beginning of the investigation. [1] This ensures that any starch present when carrying out the starch test was produced during the investigation only. [1]  You would not be awarded for stating that destarching a leaf removes any starch present —  this is implied in the question b Ethanol [1]; iodine [1] [4 marks] lightchlorophyll  ¾ ® ¾¾¾ 
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