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Chockes: WAEC 2016/2017 Biology Alt. A Practicals Questions And Answers Posted Here [26/04/2016]


CURRENT EXAMINATION:

WAEC Biology Alt. A Practicals Questions & 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)



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)
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

4ai)
S-partly aquatic&terrestrial
U-terrestrial (usually in uncompleted building)
W-open grassland/gardens/farmland/forest

2e.

4aii)
S-amphibia
U-reptilia
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 irebbed feet for swimming
ii) possession of mouth with sticky tongue for feeding
iii)dark brown skin for cam flage
iv)possession of poission gland for protection
4e)
grass---->locust---->toad

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