Phylum Arthropoda - Hexapoda Quiz

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Questions and Answers

What are the main classes of insects in Phylum Arthropoda?

Class Arachnida

Class Myriapoda

Class Hexapoda (correct)

Class Crustacea

Why must insects molt?

Because the exoskeleton cannot grow with them, so they must shed it off in order to grow larger.

Are insects segmented?

True

Do hexapods have a coelom?

True Signup and view all the answers

Are hexapods biploblastic or triploblastic?

Triploblastic Signup and view all the answers

Are hexapods symmetrical?

True Signup and view all the answers

Do hexapods have an open or closed circulatory system?

Open Signup and view all the answers

What are hexapoda skeletons made up of?

Protein and chitin Signup and view all the answers

Hexapods were the first group to have?

Jointed appendages Signup and view all the answers

What are the three body regions of insects?

Head, thorax, and abdomen Signup and view all the answers

What does the arthrodial membrane refer to in hexapods?

Thin flexible membrane at the joints that allows limb segments to bend. Signup and view all the answers

What does ommatidia refer to in hexapods and what does it do?

Ommatidia are eyes that consist of many individual lenses. Signup and view all the answers

Where are the olfactory (smell) receptors located in hexapods?

Often located in antennae, some in mouthparts. Signup and view all the answers

What does tympanum refer to in hexapods?

Similar to our eardrum, many insects use this to detect sound. Signup and view all the answers

Where is tympanum located on insects?

On the body and/or legs Signup and view all the answers

What are the three different mouthparts in hexapods?

Maxillae, labium, mandibles Signup and view all the answers

What is metamorphosis?

A change in form from egg to adult Signup and view all the answers

What are the two types of metamorphosis?

Hemimetabolous (simple) and Holometabolous (complete) Signup and view all the answers

Study Notes

Class Hexapoda

Represents the group of Insects within Phylum Arthropoda.

Molting

Insects molt to shed their exoskeleton, allowing for growth since the rigid exoskeleton cannot expand.

Body Structure

Hexapods have segmented bodies divided into three main regions: head, thorax, and abdomen.
They are coelomates, meaning they possess a true coelom.
Hexapods are triploblastic, indicating three germ layers: ectoderm, mesoderm, and endoderm.
They exhibit bilateral symmetry, having mirrored body halves.

Circulatory System

Hexapods have an open circulatory system, where blood flows freely through cavities.

Skeleton Composition

The skeleton of hexapods is made of protein and chitin, contributing to their structural integrity.

Jointed Appendages

Hexapods were the first to evolve jointed appendages, allowing for enhanced mobility and manipulation.

Ommatidia

Ommatidia are light-sensitive structures in the compound eyes of hexapods, formed by many individual lenses. More ommatidia result in higher visual resolution.

Olfactory Receptors

Located primarily in the antennae of hexapods, and also found in some mouthparts, aiding in the sense of smell.

Tympanum

Serves a function similar to the human eardrum in hexapods, enabling sound detection. Located on the body and legs, it helps in communication and environmental awareness.

Mouthparts

Hexapods possess three primary mouthparts:
- Maxillae: Assist in tasting and manipulating food.
- Labium: Acts as the lower lip, with various functions according to the insect species.
- Mandibles: Serve as jaws for biting and processing food before ingestion.

Metamorphosis

A significant developmental process where an insect transforms from egg to adult, characterized by a change in form.

Types of Metamorphosis

Hemimetabolous: Simple metamorphosis involving gradual development from nymph to adult.
Holometabolous: Complete metamorphosis with distinct stages: egg, larva, pupa, and adult.

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Description

Test your knowledge about the class Hexapoda within Phylum Arthropoda. This quiz covers various aspects of insects, including their body structure, growth process, and classifications. Perfect for biology students looking to enhance their understanding of arthropods.