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BIOLOGY FORM THREE

TIME: 13/4 HOURS

END OF TERM THREE EXAMINATIONS 2022 FORM 3

Name: …………………………………………………………………… Adm no ……..………….  Class……………..

INSTRUCTIONS TO CANDIDATES:

  • Answer ALL the questions
  • Answers should be written in the spaces provided

Below is a photograph of an adult human jaw with teeth.  Study the diagram and answer the questions that follow.

  1. State the mode of nutrition in man.                                                                                              (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • Name the type of teeth labeled I and III.                                                                                    (2mks)

I:………………………………………………………………………………………………………

III:……………………………………………………………………………………………………

  • Name the parts of teeth labeled H and J.                                                                                 (2mks)

H:……………………………………………………………………………………..………..…….

J:…………………………………………………………………………………………………..….

  • Identify one distinguishing feature between teeth labeled II and IV.                                      (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • State one function of tooth IV.                                                                                                      (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • Write the dental formula from the jaw shown in the photograph.                                           (1mk)

……………………………………………………………………………………………..………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..……………………

  • Explain why tooth I would be more prone to dental carries than tooth III,                          (2mks)

……………………………………………………………………………………………..………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • Use the hand lens provided to observe specimen K and answer the questions that follow.
    • (i)  In the space below draw a fully labeled diagram of representative part of the specimen.                                                                                                                                                                     (5mks)

(ii)  Calculate the magnification of your drawing.                                                                    (2mks)

  • Identify:
    • The Kingdom                                                                                                                (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • The Division, to which the specimen belongs.                                                        (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • Give a reason for your answer in b (ii) above.                                                         (1mk)

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  • State the functions of any two parts labeled in your diagram.                                               (2mks)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………………………

  • What is the mode of reproduction in the specimen?                                                                 (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  • Explain the significance of colour observed in the specimen M.                                           (2mks)

……………………………………………………………………………………………..………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..……………………

  • You are provided with solutions labeled L1, L2 and L3. Note that L3 is the same as L2 except that L3 has been boiled.

Label three test- tubes A, B and C.

Into the test- tube labeled A add 1ml of solution L1.

Into the test- tube labeled B add 1ml of L1 and 1ml of L2.

Into the test- tube labeled C add 1ml of L1 and 1ml of L3.

  1. Withdraw a drop from test – tube A and place it on a white tile. To the drop add one drop of iodine solution. Record your observation in the table below.                                                 (3 mks)
Test – tubeobservationconclusion
  A                                      
    B                                  
    C                      

Repeat the procedure with contents in test – tubes B and C. Record your observations in the table.

Place the three test –tubes labeled A, B and C into a water bath at 370C.

NB. Ensure that the temperature of the water bath does not fall below 350C or exceed 380C

  • After 30 minutes, test the contents of each of the test – tubes labeled A, B and C following the procedure in (a) above. Record your observations in the table below.                                  (6 mks)
Test – tubeobservationconclusion
  A                  
    B                
    C                      
  • Why was test – tube labeled A included in the experiment?                                                     (1mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

  •  (i) suggest the identity of solution L2                                                                                            (1mk)

…………………………………………………………………………………………………………………………………………………………………………………………………………

(ii) Give a reason for your answer in (d)  i above.                                                                       (1 mk)

……………………………………………………………………………………………..…………………………………………………………………………………………………………………………………………………

……………………………………………………………………………………………………………..……

  • Suggest a part of the alimentary canal in the body of a mammal where the process being investigated in the experiment would take place.                                                                        (1mk)

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………

  • Account for the results at the end of the experiment in the test – tube labeled.
  • B                                                                                                                                                  (1mk)

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..…

  1. C                                                                                                                                                   (1mk)

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