WAEC GCE 2018 Biology Practical Answer – Nov/Dec Expo

1aii)
Longitudinal section

1bi)
i)Anther
ii)filament

1bii)
i)ovary
ii)stigma
iii)ovule

1c)
I) petal attract insect which pollinate flowers
II)ovule produce the female Genets,develop into seed
III)anther contain the pollen grains
IV)stigma receive the pollen grains at pollination

1di)
E – Marginal placentation
F – Axile placentation
G – Parietal placentation
H – Free central placentation.

1dii)
E – They are arranged in a single row.
F – They are divided into chambers.
G – The placenta occurs at the edge.
H – The placenta occurs freely in the centre.

2b)
The letter X between diagram A and B represent mating (cross breeding)

2ci)
i)testis
ii)Sperm Cell
iii)Union
iv)Zygote

2cii)
i)Because it where Sperm Cell are formed
ii)because it has head and tail region for movement
iii)Because the sperm and egg fuse together
iv)it is the product of the Union

4b)
i- hair shaft
ii- sebaceous gland
iii- erector muscle
iv- sweat gland
vi- blood vessel
vii- fatty cells
viii- cold sense receptor
ix- dermis
x- epidermis

4b)
i) excretion
II) maintenance of a suitable constant body temperature
iii) storage of reserved food
iv) protection
v) osmoregulation

4c)
low – constricts
high – contracts

4d)
VI) transfers oxygen and nutrients to the skin
VIII) responsible for sensitivity of the skin to light
X) provide a water proof Barrie’ and create our skin tone