Waec 15/16 May/June 100% Correct Biology Practical Question & Answer

(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 ==================================== (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 ++++++++++++++++++++++++++++++