Waec 2018 Biology pratical Answers

(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



4ai
I) calyx
II) corolla 
III) androecium
Iv) gynoecium

4Aii
I) calyx--5
II) corolla --5
III) androecium--5
Iv) Gynoecium---1

4bi) It is unisexual 
4bii) it has both male and female sexual organ
4cI) it is bilateral 
4cii)If the specIman Is cut along it's axis into two, they will become identical halves 
4D) specimen k--


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