A) Insecta
B) Trematoda
C) Nematoda
D) Polychaeta
Correct Answer: A
Solution :
Ecdysone or prothoracic gland hormone is secreted by prothoracic gland in insects. Ecdysone speed up metamorphosis in insects and other hormone. Juvenile hormone secreted from corpora allata in insects and responsible for larval characters.
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