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WAEC 2017 - BIOLOGY PRACTICAL ANSWER

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EXAM TIME: Wednesday, 26th April, 2017
Biology 3 (Practical (Alternative A) 09.30am – 11.30am (1st Set)
Biology 3 (Practical (Alternative A) 12.00pm – 2.00pm (2nd Set)

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(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

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(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.

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(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]





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