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Biology Paper 3,Nov/Dec 2009  
Questions:   1 2 3   Main
General Comments
Weakness/Remedies
Strength

















































Question 3

Study the diagram F and G below and use them to answer questions 4 (a) to 4(d)

(a)   (i)   Identify the organisms F and G in the diagrams without reasons.
              F.  ………………………………………………………………………………………………………………………………
             G.   …………………………………………………………………………………………………………………………….
      
                                                                                                                                       [2 marks]
    (ii)    Name the parts labeled I to VI in F and G

  1.  ………………………………………………….         IV. ………………………………………………….
  1. ………………………………………………….           V. ………………………………………………….

 

  1. …………………………………………………           VI. ………………………………………………….

                                                                                                                            [3 marks]

      (iii)       State one function each of the parts labeled I and IV in F and G
               
                 I        ………………………………………………………………………………………………………………………………
                IV      …………………………………………………………………………………………………………………………….
                                                                                                                                [2 marks]
(b)      (i)     State the mode of feeding of F and G
                   F.  ………………………………………………………………………………………………………………………………
                  G.   …………………………………………………………………………………………………………………………….
                                                                                                                                [2 marks]
          (ii)    State one similarity in the modes of feeding of F and G
                    …………………………………………………………………………………………………………………………………
                                                                                                                                 [ 1 mark]
         (iii)    Tabulate two differences in the modes of feeding of F and G
     

F G
   
   

        (iv)   State the biological significance of the mode of feeding of F.
                 …………………………………………………………………………………………………………………………………….
                 …………………………………………………………………………………………………………………………………….
                 …………………………………………………………………………………………………………………………………….
                                                                                                                                [3 marks]

   (v)    State two observable features each of F and G which adapt them to their mode of
            feeding.

            F.  ……………………………………………………………………………………………………………………………………….
                 ……………………………………………………………………………………………………………………………………….
          G.   ………………………………………………………………………………………………………………………………………
                ……………………………………………………………………………………………………………………………………….
                                                                                                                                      [8 marks]
(d)   (i)    Name the class to which G belongs stating two reasons.
               Class ……………………………………………………………………………………………………………………………….
               Reasons …………………………………………………………………………………………………………………………..
                               …………………………………………………………………………………………………………………………..
                                                                                                                                      [ 3 marks]
       (ii)    State four effects of G on animals.
                ……………………………………………………………………………………………………………………………………….
                ……………………………………………………………………………………………………………………………………….
                ……………………………………………………………………………………………………………………………………….
                ……………………………………………………………………………………………………………………………………….
                                                                                                                                       [4 marks]

_____________________________________________________________________________________________________
OBSERVATION

Many candidates could not properly identify the specimens namely F.  Venus fly trap, G tick   and so this affected their responses on the other sub answers. The few candidates who could correctly name the  parts lost marks due to spelling errors.  A number of candidates  could state the function of  the bristle on the fly trap and the mouth part of the tick but  could not correctly state, the mode of feeding of the specimens, the similarities and differences in the  modes of feeding of F and G as well  as the biological significance of the mode of feeding of F.

    Expected answers include.

     Name of parts
      I      -   Bristle/hair like structures                             IV   -   Mouth part.
     II      -    Sensitive hair                                                   V    -   Cephalothorax/Prosoma
    III      -    Leaf                                                                   VI    -    Abdomen/opisthosoma

                    6 x ½     ( 3 marks)

     Mode of feeding of F & G
     F      -   Insectivorous/Carnivorous/Phorosynthetic
     G     -   Parasitic

     Similarity in feeding
     Both feed on animals

     Differences in mode of feeding
                       F/Venus fly trap                                             G/Tick
    

  •  Two modes of feeding/                               -    One mode of feeding/parasitic

Carnivorous/Photosynthetic

  •  Extra cellular digestion                                -    Intra cellular digestion.

     Biological significance of mode of feeding in F     

  • the plant usually grows in places with little/no nitrogenous salts;
  • so in addition to photosynthesizing;
  • the plant uses insects/small animals;
  • as a protein/nitrogenous salts source;
  • to make up for this deficiency.

Again many candidates performed poorly at stating two features of F/fly trap G/ tick which adapt to their modes of life, could not properly classify specimen G with reasons or state its  effect on animals.

    Expected answers include.

    Observable adaptive features

    F/Venus fly trap
    -     Presence of bristles/hair-like structures        -    to detect the presence of insects/sensitive to
                                                                                      touch  by insects;
    -      Trap-like structure                                                     -     to capture the insects;
    -      Large surface area of leaves                                    -      for trapping of prey/insect/digestion of food.

   G/Tick
    -     Piercing and sucking/sharp pointed                 -     for piercing host skin/sucking blood;
          Mouth parts.
    -     Large abdomen                                                   -      for storing blood;
    -     Claws on legs                                                       -     to hold on to the host/support.

   Class of G/Tick
    Arachnida

 Reasons
   -     2 body divisions/possession of cephalothorax and abdomen;
   -      possession of eight legs/four pairs of legs;
   -      possession of a pair of pedipalps.

Effects of G/Tick on animals

-     loss of weight/retarded growth/loss of blood/anaemia;
-     restlessness/uncomfortable/irritation;
-     transmission/victor of diseases;
-     development of sores on skin;
-     loss of hairs around the infested area;
-     production of poor hides/skin.

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