Nov/Dec 2018 Waec Gce Biology Practical Answers

Nov/Dec 2018 Waec Gce Biology Practical Answers

(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

2ai)
A Sex male
B Sex female
2aii

A – Because is a sperm cell tum
Because D is an enoumerom B

The letter X between cliedram A and B
represent mating (crossbreeding)
1 testis
Ito Sperin Cell
Union
Zygote 2 ci
1 => Because it whene Sperm Cell Que formeel
11 because it has head and tail on for movement
in =) Because the sperm colegg fuse together
(2D)
1) => it is the product of the Union
The process is meiotic twisiors

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4ai) Vertical section of a human skin

aii)
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

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