Page 111 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

(c) (d)
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(f)
(e) (g)

(i) (j)
(h)

Figure 5.32: Examples of Arthropods (a) prawn (b) scorpion (c) tick (d) beetle (e)
butterfly (f) crab (g) spider (h) centipede (i) millipede
(j) grasshopper

General characteristics of arthropods (c) They have segmented bodies. In most
(a) They have exoskeleton made up arthropods, the body is organised
mostly of chitin. The exoskeleton into three major regions. These
serves different purposes, such regions are the head, thorax and
as muscles attachment, support abdomen. In some arthropods, such
and protection against physical as arachnids and crustaceans, the
damage. thorax and head are fused together to
(b) Some arthropods grow by form the cephalothorax. Therefore,
periodically shedding off their these arthropods have two major
exoskeleton in a process called body parts, namely cephalothorax
moulting or ecdysis. and abdomen.

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