Question

Which of the following is not a key advantage provided by the exoskeleton of terrestrial arthropods?

a. Prevents desiccation

b. Protects internal tissue

c. Provides mechanical support

d. Grows with the arthropod throughout its life

Short answer

Option d is the correct answer.

Step-by-step solution

Introduction

The anatomical and functional segmentation of the body and the existence of jointed appendages are shared by all creatures in this phylum. Arthropods have a durable, waterproof polymer called chitin that makes up the majority of their exoskeleton.

The explanation for the correct answer.

The amount of calcium salt deposited within the chitin can be excessive in particular circumstances, such as in lobsters. The exoskeleton must be "shed" by the arthropod during the physiological process of moulting, which is followed by the physical stripping of the outer cuticle, known as ecdysis (from the Greek ecdysis, "to strip off"). This growth strategy first appears to be risky because the animal is vulnerable to predators while its new exoskeleton is hardening; However, ecdysis and moulting also permit morphological growth and change. So, Growing of exoskeleton with the arthropod throughout its life is not a key advantage.

The explanation for the incorrect options.

In addition to aiding in support and mobility, the exoskeleton also offers protection from the outside environment, prevents desiccation, protection of internal tissue, and a substantial surface area for the attachment of muscles.