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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Insect development is regulated by:

a. ecdysone, a peptide secreted by the brain.

b. juvenile hormone, a terpenoid secreted by the corpora allatanear the brain.

c. molt-inhibiting hormone, a steroid secreted by the prothoracicglands.

d. prothoracicotropic hormone, a steroid secreted by thehypothalamus.

e. melatonin, a peptide secreted by the brain in the larval stage.

Summary Introduction

Introduction:

In animals, hormones are produced by the neurosecretory neurons. They regulate the processes of reproduction, development, and growth of some of the features of the body. They also regulate the sugar levels, heart rate, water balance, and reproduction in annelids, arthropods, and mollusks. Certain hormones are related in invertebrates and vertebrates.

Explanation

Justification for the correct answer:

Option (b) is “juvenile hormone, a terpenoid secreted by the corpora allata near the brain.” This option is correct as the juvenile hormone regulates the outcome of molt. High levels of juvenile hormone produce a larger larva, whereas, low levels lead to pupation. It is produced by the corpora allata, a paired gland present behind the brain. Hence, option (b) is correct.

Justifications for the incorrect answers:

Option (a) is “the ecdysone, a peptide secreted by the brain.” This is false as the ecdysone is a steroid hormone, which is secreted by the prothoracic gland. It is not a peptide hormone. So, it is an incorrect option.

Option (c) is “molt-inhibiting hormone, a steroid secreted by the prothoracic glands...

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