waecE-LEARNING
Biology Paper 1 Practical, May/June 2013  
Questions:   1 2 3 4   Main
General Comments
Strength
Weakness/Remedies























Question 2

Study specimens E, F, G1 and G2 carefully and use them to answer questions 2 (a) to 2 (d).

  1.  (i)    Name the life process in mammals that is associated with specimen E.  [1 mark]

(ii)   State two structural similarities between the surface of specimen E and the skin of specimen F.  [2 marks]
           

  1.  (i) Name the habitat in which specimen F will function efficiently.  [1 mark]

(ii)  Explain how two observable features of specimen F adapt the organisms to its habitat     [4 marks]

  1. (i) sp;  Using the blade provided, cut a thin transverse section of the stem of specimen G1, add two drops of freshly prepared iodine solution on the cut section.  Record your observation and inferences.[2 marks]

(ii)In which part of the stem is food stored?[1 mark]
(iii)Name two tissues used for transportation of materials in specimen G1.        [2 marks]
(iv)List two supporting tissues present in specimen G1.[2 marks]

  1. Make a drawing 10 – 12 cm long of a cut transverse section of the stem
of specimen G2 and label fully.[10 marks]



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OBSERVATION

Majority of the candidates that answered this question performed impressively.  This was the most popularly answered and passed question.  The problem most candidates had was in the drawing and observing the stained transverse section of waterleaf realistically.

The expected answers include:

2 (a) (i) Life process in mammals associated with specimen E
External Respiration/Respiration/Gaseous exchange/Breathing.                                           
(ii) Similarities between Specimens E and F

  • Both richly supplied with blood capillaries/vascularised;
  • both have thin surface;
  • both are moist;
  • both have large surface area.

   (b) (i) Habitat of specimen F
            Land/Terrestrial/Moist place/Pond.                                                    
       (ii) Observable Features that adapt specimen F to its habitat

  • large bulging eyes for wide vision;
  • streamlined body for easy movement in water;
  • webbed digits of hind limb(s) for swimming;
  • muscular long hind limbs for hopping/jumping;
  • stout short forelimbs for absorbing shock on landing;
  • presence of poisonous gland for protection against predators;
  • moist skin for gaseous exchange/breathing/respiration.

 

 

(c) (i) Observation
            Cortex stained blue black                                                                                                                   Starch present in the cortex.
   (ii) Part of stem where food is stored
            Cortex/parenchyma.                                                               
   (iii) Tissues for transportation in G1
Xylem; phloem.                                                                                                          
   (iv) Supporting Tissues in G1
            Collenchyma, sclerenchyma, xylem, parenchyma.                                                                                                                                                                                         
(d) Drawing of specimen G2
           
Drawing of Transverse section of the stem of specimen G2/Waterleaf plant

Details (D)
VR – Vascular bundles arranged in ring at least four vascular bundles shown
WP – Wide Pith
ED – Epidermis in double lines
CS – Cortex shown

Labels
Vascular bundle/Xylem/phloem, pith, cortex/collenchyma/parenchyma, epidermis, medullary ray.


 

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