Waec 2016 BIOLOGY PRACTICAL ALT. A Answers – May/June Expo

BIOLOGY PRACTICAL ANSWERS
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1a)
OBSERVATION
i) blue-black colour was observed precipitate
RESULT
i) 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)
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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)
i)H= upper abdominal region
ii)K = thoracic region
iii)M = lower abdominal region
2bi)
i)BILE
2bii)
i)it emulsifies fat & oils
ii)provide alkaline medium for digestion of food
2biii)
i)H = Liver
2ci)
i)Dark brown in color
ii)dense and bulky
SPECIMEN K
i)Reddish in color
ii)it is soft & moist
2cii)
i)has large surface area
ii)it supplied in blood vessel
2d)
i)K = For respiration
ii)M = Excretion of wate product
2e)

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3) FOR GHANA ONLY
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4ai)
i)S-partly aquatic&terrestrial
ii)U-terrestrial (usually in uncompleted building)
iii)W-open grassland/gardens/farmland/forest
4aii)
i)S-amphibia
ii)U-reptilia
iii)W-insecta
4bi)
i) presence of two pairs of limbs
ii) presence of typacium
iii) presence of head with two eye
iv) a wide mouth with sticky tongue
4ci)
male
4cii)
i) it has a brightly colour head
ii) it has gular fold
4d)
i)It has webbed teeth for swimming
ii)Presence of mouth with sticky tongue
iii)possession of poision gland for protection
iv)Dark brown skin camonflag
4e)
grass—->locust—->toad
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