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Waec Gce Biology Practical Answers – Nov/Dec 2018 Expo
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Posts: 6
chidusky
chidusky (m)
0 year ago

*BIOLOGY-PRACTICALS*
(2ai)
A - Male
B - female

(2aii)
A - Because E is a sperm cell from A
B - Because D is an egg(ovum) from B

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

(2ci)
I - Testis
II - Sperm Cell
III - Union
IV - Zygote

(2ci)
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

(2d)
The process is meiotic division

===========================================

4a)
Vertical section of a human skin
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
4e)
i) hot day
-vasodilatation
-sweating and cooling
-skin relaxation
ii)Cold day
-vasoconstriction
-Erector muscle contract
-skin assume erect position with trapped in between
4f)
victim D
4g)
i)bathing with soap and water
ii)exposure to fresh air
iii)check up on disease break out
iv)exposure to sunlight

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gbolahan
gbolahan (m)
0 year ago
I haven't seen my password oooo
kingzik2000
kingzik2000 (m)
0 year ago
I haven't seen my password
kingzik2000
kingzik2000 (m)
0 year ago
I haven't seen my password
kingzik2000
kingzik2000 (m)
0 year ago
I haven't seen my password
chidusky
chidusky (m)
0 year ago
kingzik2000:

I haven't seen my password


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