WAEC 2017 expo Biology 3 (Practical Alternative A) and objective runz Question,Answer Now Available -MAY/JUNE

BIOLOGY PRACTICAL ANSWERS:
(1ai)
Arthropoda
(1aii)
-They have segemented bodies
-Their bodies are divided into head,thorax and abdomen
-They have exoskeleton
(1bi)
TABULATE
Specimen C|Specimen D
-It has wings|It does not have wings
-It has jointed legs|It does not have jointed legs
-It does not have clasper|It has clasper
(1bii)
TABULATE
Specimenc C|Specimen E
-The antennae are not segemented|The antennae are segemented
-The eyes are smaller|The eyes are bigger
-It has labial palps|It does not have labial palps
(1c)
They are both insects
(1di)
Leaf of a plant
(1dii)
-Posession of spiracle for breathing
-Posession of hooks for attachment
(1e)
DIAGRAM
(2ai)
Specimen F:
(i) It has venation leaves
(ii) It is pink in color
(iii) It has lateral leaves
(2aii)
Specimen G
-It has dormant bud
-It has vascular ring
-It has periderm skin
-It has medulla
(2bi)
F – Root tuber
G – Stem tuber
(2bii)
Specimen F
-it has an adventitious root
-it has bud at the base
Specimen G
-It has some bud on its surface
-it is a swollen end of of a special underground plant.
(2c)
H – Class is Insecta
J – Class is insecta
Tabulate the different btw H & J
Specimen H
-it has proboscis
-it is smaller than J
-it feed on blood
-it has no color
SPECIMEN J
-It has Labrirum
-It is Larger
-it feed on abandon food
-it is dark brown
(2dii)
-They both has wing
-They are both active in the night
-They both breadth with aid of trachea system
-The body is divided into head thorax & abdomen
(2ei)
H – as proboscis for sacking blood
J – It as Labrirum for bitting & chewing.
(2eii)
-has a pair of antenna for preserving food
-Has a bitting & chewing mouth part
(4ai)
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) they improve the fertility of soil in different ways.and therefore they are important in agriculture
(ii) they also reduced the the alkalinity and acidity of the soil to provide better conditions for plant growth.
(iii) they are used for bait and food as bait they used it in catching fish.
(4c)
[Drawing]
(4d)
S – Drupe
T – Berry
(4e)
Tabulate:
Specimen S
-The seed is not many
-It has seed chamber
-It has oval shape
-It has no sepal attached
Specimen T
-The seeds are many
-It does not have seed chamber
-It has a spherical shape
-It has sepal attached
(4e)
-They both have succulent mesocarp
-They both have thin epicarp
-They both have seeds
-They both have endocarp

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