BIOLOGY PAPER 3 - KCSE 2019 JOINT PRE MOCK EXAMINATION NAMBALE

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  1. You are provided with two potato cylinders and solutions labeled X and Y of different concentrations.
    • Place one potato cylinder in solutionX and another in solution Y.
    • Leave the set – up for 30 minutes.
    • Remove each of the cylinders from solutions X and
    • Press each of the cylinders gently between your fingers and note the texture in each case.
      1.  
        1. Record the texture of each cylinder in solutions X and Y.
          Solution X:………………………….                                                            (1mk)
          Solution Y: …………………………                                                            (1mk)
        2. Account for the observation made for the potato cylinder placed in solution X.                  (3mks)
        3. State the nature of the cells of the cylinder placed in solution Y.      (1mk)
      2.  
        1. What observation would be expected if the potato cylinder were boiled before       being placed in the solutions?                                                                    (1mk)
        2. Give an explanation for your answer in b (i) above.                           (2mks)
      3. Which potato cylinder is likely to increase in length? (1mk)
      4. Explain what will happen to the red blood cell when placed in solution X. (1mk)
  1. You are provided with photographs of specimens labeled L and S. Examine them. 
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    1. State the conditions under which each set was grown:
      Set L   …………………………………………………………………...     (1mk)
      Set S    …………………………………………………………………..      (1mk)
    2.  
      1. Name the part labeled G in specimen                                             (1mk)
      2. What is the role of the part named in b(i) above.                               (1mk)
      3. Explain how part G straightens to enable the seedling grow upright. (2mks)
    3. State two functions of the part labeled (2mks)State three differences between seedlings in set L and S.                             (3mks)
       

      Set L

      Set S

      (i)      

         

      (ii)    

         

      (iii)  

         
    4. State the role of the following in germination.
      1. Air
      2. Water
    5. State the biological significance of the phenomenon exhibited by the seedling in set – up                                                                                                             (1mk)
  1. You are provided with specimens labeled K and L obtained from the same mammal.
    1.  
      1. Identify specimens K and L                                                               (2mks)
      2. State the functions of specimens K and L.                                        (2mks)
    2. Give two adaptations of specimen L to its function. (2mks)
    3. Give three differences between specimens K and (3mks)
       

      Specimen K

      Specimen L

      (i)      

         

      (ii)    

         

      (iii)  

         
    4. Draw and label the parts of specimen (4mks)
    5. Explain how tooth decay occurs. (2mks)

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