2018 Waec Gce Biology practical answers (2nd series) - Nitegist

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I

(A) Sperm Cell
(B)
(C) Motor Neuron

II
(A) Acrosome
(B) Nucleus
(C) Plasma Membrane
(D) Middle Piece
(E) Head
(F) Dent rites
(G) Axon
(H) Muscle Fibres

Functions
(I) to help the sperm gets through the egg's protective coat and to allow the plasma membrane of the sperm and egg to fuse

(III) to associate with sperm cap agitation, Acrosome reaction and sperm - egg fusion

(VI) they conduct electrical messages to the Neuron cell body for the cell to function

(VII) conduct electrical impulses away from the cell body
=====================================

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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