[Campbell Biology P.1055] According to Figure 45.12 and the accompanying text, what is the co... | Practice Question
According to Figure 45.12 and the accompanying text, what is the correct sequence and function of the primary hormones and glands involved in initiating insect molting?
A: Corpora allata secretes JH, which then stimulates the prothoracic gland to produce ecdysteroid.
B: Neurosecretory cells in the brain produce PTTH, which travels to the prothoracic gland to stimulate ecdysteroid release.
C: The prothoracic gland produces PTTH, which is stored in the corpora cardiaca before stimulating molting.
D: Ecdysteroid is released episodically by neurosecretory cells, leading to pupa formation.
E: Corpora cardiaca directly produces ecdysteroid, which triggers metamorphosis.
Explanation
According to the text and step 1 and 2 in Figure 45.12, neurosecretory cells in the brain produce PTTH, which is then released and signals the prothoracic gland to produce ecdysteroid, initiating molting.