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Class Arachnida Overview

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Questions and Answers

Which of the following characteristics is exclusive to Class Arachnida?

Body is divided into segments with a pair of legs

Presence of gills or book lungs for respiration (correct)

Possession of a pair of antennae

Oviparous reproduction with no true metamorphosis (correct)

What are the primary appendages found on the head of organisms in Myriapoda?

One pair of antennae and one pair of appendages (correct)

Two pairs of chelicerae

Four pairs of legs

Two pairs of pedipalps

Which statement regarding Arachnida is inaccurate?

They are characterized by separate sexes.

They possess true jaws. (correct)

They lay eggs directly. (correct)

They may have segmented abdomens.

How many legs are typically present on organisms belonging to Myriapoda?

<p>An extensive number of pairs, generally one per segment</p> Signup and view all the answers

What type of visual system is primarily found in most spiders?

<p>Simple eyes arranged to provide a panoramic view</p> Signup and view all the answers

Study Notes

Class Arachnida

Body structure includes a fused cephalothorax formed from anterior segments.
Possesses chelicerae with claws, two pairs of pedipalps, and four pairs of legs.
Lacks antennae and true jaws.
Abdomen can be segmented or unsegmented, may or may not have appendages.
Respiration occurs through gills or specialized structures known as book lungs.
Excretory system consists of Malpighian tubules.
Simple eyes present; sexes are separate.
Reproduces through laying eggs (oviparous).
Exhibits no true metamorphosis; includes organisms like scorpions, spiders, mites, and ticks.

Myriapoda

Body is composed of a large number of segments, each typically bearing a pair of legs.
Head features a pair of antennae and an additional pair of appendages.
Notable example includes centipedes.

Insects

Spiders typically have eight eyes arranged to provide a broad panoramic view, aiding in detecting both predators and prey.

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Description

Explore the key characteristics and features of Class Arachnida. From their unique body structure to their reproductive methods, this quiz covers the essentials of these fascinating arthropods. Test your knowledge on their physiology, behaviors, and classification.