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← Nature & AnimalsWhich consequence results when an insect pupa's prothoracicotropic hormone (PTTH) cycle malfunctions?
A)Premature adult structure development occurs
B)Cuticle melanization rate will increase
C)Incomplete metamorphosis towards adult form✓
D)Reduced juvenile hormone production results
💡 Explanation
Insects require timely pulses of PTTH to activate ecdysone (molting hormone) by the prothoracic gland; this leads to metamorphosis. An interruption impacts the imaginal discs’ final differentiation; therefore, pupae will present deformities that are larval remains, rather than complete transition.
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