WAEC 2016 MAY/JUNE 100% CORRECT BIOLOGY PRACTICAL PAPER 2,THEORY (Essay),PAPER 1,ESSAY,THEORY(Obj),QUESTIONS AND ANSWERS – FOR ESSAY,THEORY AND OBJ

 

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(1ai)
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

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(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

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(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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