Prothoracicotropic hormone of adult insects is secreted by

Prothoracic glands

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Corpora allata

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Corpora cardiaca

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None of the above

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Solution

The correct option is C Corpora cardiaca
Prothoracicotropic hormone was the first insect hormone which was discovered. It was described as 'brain hormone'. The hormone is secreted by an organ known as the corpus cardiacum. This is a structure which is present in the posterior to the brain. PTTH is released in response to the environmental stimuli. The hormone acts on prothoracic glands.
Thus, the correct answer is option C.

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