2018 WAEC GCE BIOLOGY PRACTICAL ANSWER NOW AVAILABLE

(1ai)
I- Petal
II – Ovule
III – Ovary
Iv – Filament
V- Anther
Vi – Stigma

(1aii)
Female reproductive organ of a flower.

(1bi)
-IV
-V

(1bii)
-V
-IV
-II

(1c)
I – It attracts insects for pollution.
II – It produces the seeds.
V – It produces the pollen grains.
VI – It receives the pollen grains for pollination to take place.

(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.

(1diii)
E – Delonix Regia.
F – Tomato.
G – Paw-Paw
H – coconut
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(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

(2ei)
The reproductive organ (Scrotum)

(2eii)
The reproductive organ (Ovary)

(2fi)
The animal A and B that shows dominant character for skin colour is A

(2fii)
Because all the Fi generation where hetrozygote skin colours of A.

(2g)
(i)
The genotype of animal A is BB while the genotype of animal B is bb.
(ii) The phenotypic ratio of Fi generation is 4:0

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(2h)
-Height
-Size
-Horn
-Tail

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(4a) Vertical section of a human skin

(b)
(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)
(i) Low – It assumes an erect position.
(ii) High – It falls nearly flat on the skin.

(4d)
II: Secretes oily substance that lubricates the skin.
III: Controls the movement of hairs.
V: Thermo regulation.
VI: Transfers oxygen and nutrients to the skin.
VIII: Responsible for sensitivity of the skin to light.
X: Provides a water proof barrier and creates our skin tone.

(e) hot day:
=> vasodilation
=> sweating and cooling
=> skin relaxation

(II) cold day:
=> vasaconstrition
=> erector muscle contract
=> skin assume ereat protection one trapped in between

(f) vitamin D

(g)
– Bathing with soap and water
– Exposure to fresh air
– Exposure to sunlight
– Check up on disease break out

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