2018 waec biology practical answer

2018 WAEC ECONOMICS OBJ
1-10: CBCACDADDC
11-20: DACADBACCD
21-30: BDCBCAABCD
31-40: CCACDDACBD
41-50: ADBADDCACA

(1ai)
A - Stagnant water (aquatic habitat) 
B - Decomposing matter(terrestrial habitat) 

(1aii) 
A- Mosquito(Anopheles).
B- Housefly. 

(1aiii) 
A - Arthropoda (phylum)
   Insecta (class)

B - Arthropoda (phylum)
    Insecta (class)

(1b) 
Specimen A
(i) It has bristles. 
(ii) It  has horny jaw. 
(iii) It has siphon 

Specimen B
(i) It has a hook. 
(ii) It has mouth. 
(iii) It has spiracles.

(1ci)
In a tabular form
Under A
(i)  It has not got a hook 
(ii)  It has a bristle. 
(iii) It has siphon 
(iv) It has mouth brush. 

Under B
(i)  It has a hook 
(ii) It doesn't have a  bristle. 
(iii) It does not have siphon.
(iv) It does not have mouth brush. 

(1cii)
(i) They are both segmented organisms. 
(ii) They both have mouth.
(iii) Both have thorax
2a)
A- Fish
B- mammal
E- flowering plant
2aii)
they are used for respiration
2aiii)
i)possession of two rows of fine finger like filament
ii)possession of gill rakers
iii)possession of richly supplied blood capillaries
2b)
i)they both are supplied with capillaries
ii)both of them are used for respiration

2bii)
In a tabular form; Specimen C and specimen D
Under specimen C
() Possession of gill rakers.
ii) Possession of gill filament.
iii) Possession of gill arch.
Under specimen D
i) Possession of bronchus.
ii) Possession of alveoli.
iii) Possession of alveolar cavity.

2c)
Draw the 6cm-8cm long of specimen C ie Gill of fish

(4)
(ai) Sepals, Petals, Carpels and Stamens
(ii) Sepals - 5
(iii) Petals - 5
(iv) Carpels - 1
(v) Stamen - 10

(4bi) Sex - monoecious 
(ii) presence of both Carpels and Stamens

(4c)
i - Bilateral
ii - it can be cut vertically into two similar halves through one plane

(4d)
K - insect
L - wind

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