A) ecdysone
B) salivary glands
C) parotid gland
D) juvenile hormone
Correct Answer: D
Solution :
Juvenile hormone is produced by corpora allata in insects. It favours the development of juvenile characteristics during larval life, this hormone predominates and each moult yields another larger juvenile and keeps the larva in immature condition or maintains juvenility. Ecdysone is a steroidal, moulting hormone of the prothoracic glands, named 'ecdyson' in insects that triggers metamorphosis. Salivary glands are the merocrine or epicrine type of gland. Their secretion diffuses on through the cell surface, causing no damage to the cell. Parotid glands are compound tubulo-acinar glands and are the type of salivary glands with a flask-like secretory portion.
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