waecE-LEARNING
Biology Paper 1 Practical, May/June 2012  
Questions:   1 2 3 4   Main
General Comments
Weakness/Remedies
Strength
Question 2

Study carefully specimens J,K and L and use them to answer questions 4(a) to 4(d).

  1.  (i)       State the class of each of specimens J,K and L                       [3 marks ]

(ii)       State three reasons each for placing each of specimens
          J,K and L in their classes.                                                          [9 marks]

  1.  State two structural adaptations possessed by each of

 specimens K and L for escaping predators                                        [4 marks ]

  1.    Make a drawing, 8 – 10 cm long of the lateral view of specimen J  [10 marks ]

 

  1.   State two similarities;
  1.  two observable differences between specimens J and L    [4 marks ]



_____________________________________________________________________________________________________
OBSERVATION

   In stating the classes of specimens J,K and L.  Most candidates stated the class of Tilapia as
   Pisces and not Osteichthyes, of the toad as Amphibian and Lizard as Reptilian and not Reptilia
   and so lost the marks.
    In writing the reasons for placing the specimens in their classes some candidates wrote on their
    mode of feedings, habitat e.t.c. instead of stating observable features.
    Expected answers include:

     Class of Specimen J /Tilapia – Pisces    
            Reason

  • Body is covered with scales;
  • Presence of paired fins;
  • Presence of lateral line(s);
  • Presence of operculum/gill cover.

Class of Specimen K/Toad- Amphibia   
            Reason

  • Presence of warty skin;
  • Presence of webbed digits;
  • Presence of moist skin;
  • Absence of bulging eyes;
  • Presence of ear drum.

            Class of Specimen L/Lizard–Reptiles   
            Reason

  • Presence of dry horny  scales on skin;
  • Presence of fore and hind limbs with clawed digits;
  • Homodont dentition;
  • Well developed retractable tongue.

            
 Most candidates performed well on structural adaptation of specimens K/Toad and L/Lizard for    escaping predators, but many candidates wrote poisonous gland for toad instead of poison gland and so lost the score .
Most candidates did not perform well in stating the similarities and differences between specimens J and L and the drawing of a lateral view of specimen J/Tilapia
Expected answers include:
Drawing of lateral view of specimen J/Tilapia
           
            Details
            Mouth drawn with double line (MD)
            Operculum shown (OS)
            Scales overlapping backwards (SB)
             Lateral line shown (LS)
             
             Labels
             Mouth, eye, head, nostril, dorsal fin, causal fin, pelvic fin, operculum, lateral line, anus

 

 

(d)(i)    Similarities between Specimens J & L
            -           Presence of eyes;
            -           presence of nostrils;
-           Presence of scales;
-           presence of head;
-           Presence of tail.                                  

      (ii)  Differences
J/Tilapia                                                           L/Lizard
            -  Presence of fins                                          Presence of limbs
            -  Absence of tympanum                                Presence of tympanum
            -  Lateral line present                                      Lateral line absent
            -   Short tail                                                    Long tail
            -    Presence of operculum/gill cover             No operculum/gill cover

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