2018/2019 WAEC EXPO RUNZ: BIOLOGY PRACTICAL QUESTIONS AND ANSWERS








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1ai)
A- lives in stagnant water(Aquatic)
B- Decomposing Matters (Teresial Habitat)

1aii) A- Mosquito (Anopheles)
B- Housefly
III) A- Arthropoda(phylum)
Insecta (Class)
B- Arthropod (Phylum)
Insecta (Class)

1ai)
A- water
B- decaying plant and animal matter
———————————————————

1aiii)
A) A phylum is Artropoda, class is insecta
B- phylum is Artropoda, class is insecta
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1b)
A)
i) well developed head with mouth brushes
ii) on large thorax with no legs
iii) segmented abdomen

B)
i) reduced head
ii) legless
iii) mouth parts at the pointed end
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1ai)
A- water
B- decaying plant and animal matter
———————————————————

1aiii)
A) A phylum is Artropoda, class is insecta
B- phylum is Artropoda, class is insecta
——————————————————
1b)
A)
i) well developed head with mouth brushes
ii) on large thorax with no legs
iii) segmented abdomen

B)
i) reduced head
ii) legless
iii) mouth parts at the pointed end
——————————————————

1c) in tabular form
A-
I) mosquito larvae can only survive in water
ii) well developed head
iii) mouth part in sucking

B
i) maggots do not need a water habitat to survive
ii) reduced head
iii) mouth parts for biting and chewing

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1cii)
i) both are legless
ii) both have thorax
iii) both have mouth parts

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2a)
i)C- Tilapia fish
D- Rat
E- Mango plant
ii)Excretion
iii)
(a)Presence of gill filament which helps in gaseous exchange
(b)Presence of gill rakers which traps particles that might damage the delicate gill filament
(c)Gill arch which is bony and holds the gulls filament in shape

2b)
i)• Both have thin surface
ii)• Both are moist

2bii)
Tabulate
Under C
(a)Gill arch is present
(b)Gill filament is present
(c)Gill rackers is present

Under D
(a)Gill arch is absent
(b)Gill filament is absent
(c)Gill rackers is absent

4a
I)Sepals,petals,carpels and stamen
ii)Sepals- 5
Petals – 5
Carpels -1
Stamen -19

4b
i)Sex – monoeccious
ii)Pressure of both carpels and stamens

4c
i)Bilateral
ii)It can be cut vertically into two similar halves through one olane

4d)
K- insect
L-Wind

(4e)
In a tabular form; K and L

Under K
(i) Has very bright colours.
(ii) Single flower per stalk.
(iii) Has petals.
(iv) Lacks bracts.

Under L
(i) Lacks bright colours.
(ii) Bears many flowers per stalk(influorescence).
(iii) Lacks petals.
(iv) Has bracts.

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