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a
Head lies at right angles to the longitudinal axis of the body
b
Mobility of the head is due to flexible neck which is an extension of prothorax
c
Body is covered by a hard collagenous exoskeleton
d
Arthrodial membrane is a flexible articular membrane that joins the sclerites
answer is C.
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Detailed Solution
The exoskeleton of cockroach is chitinous in nature. It forms sclerites namely dorsal tergites, ventral sternites and lateral pleurites. The exoskeleton helps in protection and conservation of water.