Waec 2017 Biology (Practical) Answers – May/June Expo

» 1ai)
i)Arthropoda

1aii)
i)They have segmented bodies
ii)Their bodies are divided into head, thorax and abdomen
iii)They have jointed appendages
iv)They have exoskeletons

1bi)
In tabular form
SPECIMEN C
i)It has wings
ii)It has jointed legs
iii)It has antennae
iv)It does not have clasper
SPECIMEN D
i)It does not have wings
ii)It does not have jointed legs
iii)It does not have antennae
iv)It has clasper

1bii)
SPECIMEN C
i)the antennae are not segmented
ii)The eyes are smaller
iii)It has labial palps

SPECIMEN E
i)The antennae are segmented
ii)The eyes are larger
iii)It does not have labial Palps

1e)

2ai)
i)Carrot is good source of vitamin.
ii)It is a source of diet that improve vision
iii)it is used in production of juice

2aii)
i)It is a good source of carbohydrates
ii)It supplies Energy
iii)It serve as primary producer for heterotrophs
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2b)
F - Is a root & tuber
G - is a stem & tuber

2bii) Specimen F
i)it has an adventitious root
ii)it has bud at the base
Specimen G
i)It has some bud on its surface
ii)it is a swollen end of of a special underground plant.

2c)
H - Class is Insecta
J - Class is insecta

Different btw H & J
Specimen H
i)it has proboscis
ii)it is smaller than J
iii)it feed on blood
iv)it has no color

SPECIMEN J
i)It has Labrirum
ii)It is Larger
iii)it feed on abandon food
iv)it is dark brown
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4ai)
phylum Annelida

4aii)
i)Body is elongated and vermiform.
ii)It has segmented body

4aiii)
Underground

4bi)
i)Their streamlined shape allows them to burrow through soil.
ii)They have no skeletons or other rigid structures to interfere with their movement.

4bii)
i)Earthworms play a vital role in breaking down organic particles in soil and aerating soil.
ii)It is used as bait in fishing.
iii)It destroys tender plant in fields and
garden by eating them.
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