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Arthropoda Phylum Characteristics

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Questions and Answers

What is the main function of the chitinous exoskeleton in arthropods?

To provide protection and rigidity (correct)

To provide a site for muscle attachment

To aid in digestion

To facilitate gas exchange

What is the characteristic of the body wall in arthropods?

It is followed by stout bundles of smooth muscles

It is dermal and followed by stout bundles of striated muscles (correct)

It is largely composed of cartilage

It is composed of striated muscles

What is the characteristic of the circulatory system in arthropods?

It is a mixed circulatory system with both open and closed components

It is an open circulatory system with a dorsal heart and blood sinuses (correct)

It is a closed circulatory system with veins and arteries

It is a purely venous system

What is the characteristic of the midgut in arthropods?

It lacks a cuticle and is the shortest region Signup and view all the answers

What is the characteristic of the excretory system in arthropods?

It is composed of a combination of green glands, coxal glands, and malpighian tubules Signup and view all the answers

What is the characteristic of the nervous system in arthropods?

It is highly developed and annelid-like Signup and view all the answers

What is the primary function of the opithosoma in Chelicerata?

Contains digestive, excretory, respiratory, and reproductive systems Signup and view all the answers

What is the characteristic of the body of trilobitomorpha?

It is dorso-ventrally flattened Signup and view all the answers

What is a characteristic feature of crustacean appendages?

They are always biramous Signup and view all the answers

Which subphylum is characterized by the presence of parapodia-like appendages?

Onycophora Signup and view all the answers

What is unique about the head of crustaceans?

It has a pair of mandibles and two pairs of maxillae Signup and view all the answers

What is the name of the larval stage that hatches from a fertilized egg in crustaceans?

Nauplius larva Signup and view all the answers

What is the primary function of the thorax in trilobitomorpha?

Swimming and walking Signup and view all the answers

Which subphylum includes terrestrial forms such as Chilopoda, Diplopoda, and Insecta?

Uniramia Signup and view all the answers

In which subphylum is the tracheal system used for respiration?

Onycophora Signup and view all the answers

What is the posterior part of the trilobite's body?

Pygidium Signup and view all the answers

What is parthenogenesis?

The process of reproduction without fertilization by males Signup and view all the answers

Why was Peripatus initially classified with molluscs?

Due to its slug-like appearance Signup and view all the answers