Questions and Answers
What are the main classes of insects in Phylum Arthropoda?
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?
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Are hexapods biploblastic or triploblastic?
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Are hexapods symmetrical?
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Do hexapods have an open or closed circulatory system?
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What are hexapoda skeletons made up of?
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Hexapods were the first group to have?
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What are the three body regions of insects?
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What does the arthrodial membrane refer to in hexapods?
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What does ommatidia refer to in hexapods and what does it do?
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Where are the olfactory (smell) receptors located in hexapods?
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What does tympanum refer to in hexapods?
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Where is tympanum located on insects?
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What are the three different mouthparts in hexapods?
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What is metamorphosis?
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What are the two types of metamorphosis?
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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.
