12. Formation of exocuticle
: The upper layer of procuticle develops as exocuticle through
addition of protein and tanning by phenolic substance.
13. Formation of endocuticle:
The lower layer of procuticle develops as endocuticle through
addition of chitin and protein. This layer increases in thickness.
Control of Moulting:
It is controlled by endocrine gland like prothoracic gland which secrete
moulting hormone. Endocrine glands are activated by prothoracico-tropic hormones produced by
neurosecretory cells of brain.
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