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Past WAEC GCE 2018 Biology Practical Answers

Below are the answers we supplied to our candidates that wrote the 2018 WAC GCE Alternative to Practical exam.

1ai)
Pectoral Girdle(Scapula
(1aii)
I-Scapula
II-Spine of scapula
III-Coracoid
IV -Glenoid cavity
V-Acronium
VI-Metacromion
(1b)
(i) Humerus
(ii) Ball and socket Joint
(1c)
(i) It holds the upper limb to the axial skeleton
(ii) Attachment of muscles
(1d)
I – Sunlight
II – Oxygen
III – Bubbles of gas
IV – test tube
V – funnel
VI – water
VII – Beaker
VIII- Elodea
(1e)
(i)To show that oxygen is given off During photosynthesis.
(ii)
-Sunlight
-carbon (iv)oxide
(1f)
(i)water
(ii)Elodea
(iii) Photosynthesis
(iv) The oxygen can be tested by bringing a glowing splincter close to it,which will be rekindled.

2a)
A- Commensalism relationship
B- predation
C- symbiotic relationship
D-epiphytsm
E-parasitism
2b)
beneficial | harmful
-A|B
-C|E
-D
2ci)
A and B
2cii)
C and D
2ciii)
B
2d)
A-cattle and cattle egrets
B-Fox and hen
C-Moss and tree
E-Pig and tapeworm
2ei)
C-Symbiotic relationships are a special type of interaction between species. Sometimes beneficial, sometimes harmful, these relationships are essential to many organisms and ecosystems, and they provide a balance that can only be achieved by working together
2eii)
D-epiphytism. a form of mutualism in which one plant lives on the surface of another

4a)
I) Operculum
II) Hind limb
III) Tympanum
Iv) Trunk
V)Eye
VI)Lateral line
VII)Dorsal fin
VIII)Caudal fin
4bi)
TABULATE
-They are poikilothermic or cold-blooded animals |They are aquatic animals
-They have fins which are used for movement/gaseous exchange in water|They have gills which are used for gaseous exchange
-They have naked or moist and glandular skin with no external skin |The skin is covered by scales but few are without scales
4bii)
-They both posses scale
-They both posses eyes
-They both posses respiratory organs
4ci)
Class of vertebrae A-Amphibian
Class of vertebrae B-Pisces
4cii)
-They posses fins which are used for movement
-They posse swim bladder which enables them to maintain bouyancy in water
-They posses lateral line system of vibration
4dii)
-They posses pigment on their skin which act as a camouflage against its predators
-They posess scales on the skin which reduces water loss from the body
-They posses digits or claws use for self defence
4dii)
-Water
-Land
4diii)
-They are use for the preparation of local medication
-They are use for food

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