Biology Paper 3 Questions and Answers - ACK Diocese Mumias Joint Evaluation Mock 2022

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  • Answer all the questions.
  1. You are provided with two specimens K1 and K2. The two specimens are similar except that they are at different stages of development.
      1. Name the plant part represented by the specimens.                                                  (1 mark)
      2. Give one reason for your answer.                                                                             (1 mark)
      1. State two differences between K1 and K2.                                                             (2 marks)
      2. Name the hormone responsible for the differences in b(i) above.                           (1mark)
    3. Cut a 20mm disc of K2 and place it in a pestle. Chop it into pieces and add 100ml of distilled water. Continue crushing and add a further 5ml of distilled water. Using a strainer, filter off the solution and label the filtrate as solution K2.   (8 marks) 
    4. Cut a 20mm disc of  K1 and observe the transverse section. Draw the transverse section of  K1 and label the parts. (3mks)
  2. You are provided with specimen X, Y and Z obtained from a mammal.  Examine them
    1. Giving reasons, identify each of the specimens. (6 mks)
      1. X
      2. Y
      3. Z
    2. Draw a diagram showing how specimens X, Y and Z articulate.   (3 mks)
    3. Describe how specimen Z is adapted to its functions. (4 mk)
  3. The photograph below shows the longitudinal section of the heart. Study it and answer the questios that follow.
    1. Use letters A, B and C to identify and label on the diagram the parts that perform the following functions. (3mks)
       A  Transport deoxygenated blood from the lower parts of the body to the heart.
       B Transports oxygenated blood from the heart to other parts of the body.
       C  Transports oxygenated blood to from lungs to the heat.
      1. Identify and label on the diagram the following parts. (3mks)
        1. Tendons
        2. Septum
        3. Thick muscles on the left ventricle
      2. How do the parts identified in b(i) above adapt the heart to its function (3mks)
    3. State two defects of the circulatory system. (2mks)


Provide each candidate with: 

  • 4 clean dry test tubes
  • Scapel/Knife
  • Freshly picked raw banana fruit labelled K1
  • Fully/completely ripened banana fruit with epicarp all yellow labelled K2.

Both K1 and K2 should be from the same species.

  • Benedict’s solution supplied with a dropper
  • Iodine solution supplied with a dropper
  • Distilled water
  • Means of heating
  • Sieve/strainer
  • Mortar and pestle
  • Ruler


  • Z - Humerus – from goat/sheep/dog/rabbit
  • X - Radius and Y- ulna – from goat/sheet/dog/rabbit


      1. Fruits                 (1mark)
      2. Has two scars (1mark)
         K1  K2
         Has green epicarp  Yellow/yellow green epicarp
         Is hard to fee  Soft to feel
         Produces sap-from epicar  Has no sap on epicarp
         No smell  Has an aromatic smell
      2. Ethylene/ethene(1mk)
       Starch  To the food substance add three drops of  iodine solution and shake Colour turns blue black Starch present
       Reducing sugar  To the food substance add equal amount of Benedict’s solution and heat to boil Colour of Benedict’s solution remain Reducing sugars absent
    4. Drawing (3mks)
        • Radius - widens/broadens towards the ends
        • Ulna; - Has olecranon process, presence of sigmoid notch;
      • Z
        • Humerus;- Has a smooth rounded head/has greater and lesser tuberosities/ has bicipital groove/ has trochlear/ has olecranon fossa;
      • Has a smooth rounded head to articulate with glenoid cavity of scapula (to form a ball and socket joint);
      • Has bicipital groove along which the tendon of biceps muscle passes.
      • Has trochlear and condyles for articulating with sigmoid notch of ulna, (forming a hinge joint);
      • Has (greater and lesser) tuberosities for muscle attachment;
      • Has a long thick shaft to bear the weight of (anterior part) the body;
      • It has olecranon fossa into which olecranon process fits when the limb is straightened.
    1. On the photograph (3mks)
      1. on the photograph (3mks)
        1. Tendons : (1mk)
          • prevent atrioventricularvalvesfrom overstretching
          • preventatrioventricular valves from turning inside out.
        2. Septum  (1mk)
          • seperates oxygenated blood and deoxygenated blood hence preventing them from mixing
        3. Thick muscle on the left ventricle (1mk)
          • Generate pressure to pumb blood overvalong distance to other parts of the bod.
      • varicose vein         (2mks)
      • Arteriosclerscis
      • Coronary thrombosis
      • Hypertension

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