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BIOLOGY PAPER 3 Marking Scheme - 2019 KCSE Prediction Answers Set 2

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  1.  
    1.   (8marks)
       Food Substance  Procedure  Observation  Conclusion
       Starch  Put 2cm3 of test solution in a test tube, add 3 drops of iodine solution Brown color of iodine persists  Starch absent
       Reducing sugar  Put 2cm3 of test  solution in a test tube. Add equal amounts of Benedict's Solution, heat to boil; reject warm Orange color observed
      Accept green,yellow      		  Reducing sugar present
    2.  Starch absent; all starch hydrolysed/broken down by enzyme (diastase); into simple sugars; (3 marks) accept. Converse
    3. Epigeal germination;                                                                            
  2.  
    1.  
      1. Atlas                                                                                                                    (1mark)
        Wide neural canal for passage of the large spinal cord in the neck region;                       (3marks)
        Broad facets for articulation with the occipital condyles of the skull;
        Broad and flattened wing-like transverse process to offer a large surface area for attachment of neck muscles;
      2. Occipital condyles;                                                                                                         (1mark)
      3.  
        1. M – Tendrils;               R – Twining stem;                                                              (2 marks)
        2. Turgidity of cells / Prop roots / Adventitious /Spines of climbers /Lignified cells /Cellulose / Pectin; @any one for 1 mrk                                                                                                (1 mark)
    2.  
      1. Sacral vertebra rej. Vertabrae                                                                                       (1mark)
      2. S-Illium;                                                                                                                         (3marks)
        T-Pubis symphysis;         (On the diagram)
        M- Greater trochanter;
      3. Proximal: Ball and socket joint;                                                                               (2marks)            
        Distal: Hinge joint;
      4. Immovable/ fixed joint;                                                                                                   (1mark)
  3.  
    1. Drawing-1mark;   Label any three parts- 3 marks;     Mag- 1 mark;   Total = 5mrks
      biop3ans3.PNG
    2.  
      1. Insect pollinated;    (1mark)
      2.  
        • Brightly coloured;         (3marks)
        • Large/Conspicuous;
        • Scented;
        • Tubular/funnel shaped;
      3.  
        • Syncarpous;        (4marks)
        • Floral parts in fives;
        • Polysepalous;
        • Hypogynous ovary (Superior)/ Ovary above other floral parts;
        • Stigma positioned higher than anthers;
        • Pedicillate flower;
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Read 6152 times Last modified on Friday, 14 June 2019 13:24

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BIOLOGY PAPER 2 Marking Scheme - 2019 KCSE Prediction Answers Set 2

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BIOLOGY PAPER 3 CONFIDENTIAL PAPER - 2019 KCSE Prediction Questions Set 2

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Published in 2019 KCSE Prediction Questions and Answers Set 2

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