WAEC 2017 Biology Practical Alternative A Questions And Answers | Free Expo

2 ai)
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

2 aii)
i ) It is a good source of carbohydrates
ii ) It supplies Energy
iii ) It serve as primary producer for heterotrophs

2b)
F – Is a root & tuber
G – is a 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
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 brownQ2c) You are to draw a table, the difference between H and J

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]