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BIOLOGY PAPER 3 Marking Scheme - 2017 KITUI MOCK EXAMINATION

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  1.  
    1. Effervescence occurs; (2 marks)
    2. No effervescence; (1 mark)
    3. Enzymes in living potatoes breakdown hydrogen peroxide; to water and oxygen; (4 marks)
    4. The gas produced relights a glowing splint; (1 mark
    5. The gas produced is oxygen; (1 mark
    6.  
      P3 ans 1f.PNG (1 mark
    7. Liver; (1 mark)
    8. Removes toxic substances from the body; (1 mark)
  2.  
    1. (7 marks)
       Specimen  Steps followed  Identity
       A  1a, 2a, 3a, 4b  Apis mellifera
       B  1a, 2a, 3b  Bedbug
       C  1b, 6b, 7a  Earthworm
       D  1a, 2b, 5b  Scorpion
       E  1b, 6a  Snail
       F  1a, 2a, 3a,4a  Batesian butterfly
       G  1b, 6b, 7b  Leech
    2.  
      1. Arachnida; (1 mark)
      2.  
        • Pairs of legs;
        • Number of body parts;
        • Absence of antennae; Mark first two points
    3.  
      1. Exoskeleton; (1 mark
      2.  
        • Supports and protects inner delicate tissues from mechanical injury
        • Prevents excessive loss of water from body tissues
        •  Prevents desiccation since it is water proof;
        • Provides a surface for muscle attachment; Mark first point
    4.  
      • Helps in pollination;
      • Makes honey which is source of food;
  1.  

    1. p3 fig 1.1.jpg
      Drawing
      • Size and proportion (Same as in Fig 1.1);                1 mark
      • Outline clear and serrate to include petiole;              1 mark
      • Veins shown joined to midrib on either side;             1 mark

      Labels
      • Midrib / main vein;                                                 1 mark
      • Petiole;                                                                  1 mark
      • Leaf blade / lamina;                                                1 mark
        Total                                                                      6 marks
    2.  
      p3fig 1.2.jpg            
      1.  
        • Epidermall cell;
        • Guard cell; (Label line must touch only the cell and not stoma)
      2. 2 guard cells ringed; (Reject if more than two guard cells are ringed)
    3.  
      • Prepare a leaf epidermis on a microscope slide;
      • mount under a microscope;
      • count the number of stomata in the field of view;
      • determine the area of the field of view;
      • calculate the area of the leaf surface;
      • number of stomata = area of leaf surface / area of field of view multiplied by number of stomata in the field of view (Maximum = 4 marks)
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