WAEC 2016 BIOLOGY PRACTICAL ANSWERS

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Observation:Blue black colouration is observed
Result:Starch is present
1aii)
Observation:No colour change is observed
Result:Starch is present
1bi)
TABULATE
Specimen A:
-Mould is absent
-Sporangium is absent
Specimen B:
-Mould is present
-Sporangium is absent
1bii)
-Presence of moisture
-Suitable temperature for the growth of mould
1biii)
-Mould
1biv)
Saprophytic
1ci)
1cii)
Yolk:Supply nutrient to the embryo
Air space:Provide air for the developing embryo
Shell:Give shape and protection to the embryo
Chalaza:Hold and suspend the embryo in position
2a)
H-Below the abdomen
K-Thoracic cavity
M-Below the abdomen
2bi)
-Bile
2bii)
-Emulsification of fat
-Digestion of fats and oil
2biii)
Specimen H
2ci)
TABULATE
Specimen H/Liver:
-Dark red in colour
-Hepatic vein present
-Divides into lobes
Specimen K/Lungs:
-Bright red in colour
-Hepatic vein absent
-Lobes present
2cii)
-Thin membrane allow easy diffusion of oxygen and
carbondioxide
-Moist surface for dissolving gases
-Large surface area for exchange of gases
2d)
K-It is used for respiration
M-It is used for excretion in animals
2e)
4ai)
S-aquatic habitat
U-Terestial habitat
W-Terestial habitat
4aii)
S-Amphibian
U-Reptilia
W-Insecta
4bi)
-Both have heag
-Both have eyes
-Both have digits
-Both have fore and hind limbs
4bii)
TABULATE
Speciman S:
-Tail absent
-Nuchal crest absent
-Gular fold absent
-Scales absent
-Has moist skin
Specimen U:
-Tail present
-Nuchal crest present
-Gular fold present
-Scales present
-Has dry skin
4ci)
-Male
4cii)
-Has brightly coloured part
-Nuchal crest present
-Gular fold present
4d)
-Body colour blend with surrounding for camouflage
-Short stout fore limbs acts as shock absorber for landing
-Long, stron hindlimbs for hopping on land
-Long tongue attached to the front lip for easy catching of
prey
-Buldging eyes to see above water when body is
submerged
4e)
Spec T->Spec W->Spec S

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