invertebrates Flashcards
What are invertebrates?
Animals without a backbone.
True or False: All invertebrates are aquatic.
False.
Name one characteristic that distinguishes invertebrates from vertebrates.
Invertebrates lack a spinal column.
Which phylum includes jellyfish and corals?
Cnidaria.
What is the largest phylum of invertebrates?
Arthropoda.
Fill in the blank: Invertebrates can be classified into __________ main groups.
nine.
What type of symmetry do most echinoderms exhibit?
Radial symmetry.
True or False: Mollusks have a hard outer shell.
True, but not all mollusks have a shell.
Give an example of a cephalopod.
Octopus.
What is the primary characteristic of annelids?
Segmented bodies.
Which invertebrate group is known for having jointed limbs?
Arthropods.
Name a feature that is common in all cnidarians.
Stinging cells called cnidocytes.
What type of body plan do flatworms exhibit?
Bilateral symmetry.
True or False: All invertebrates reproduce sexually.
False; some reproduce asexually.
Which invertebrate group includes earthworms and leeches?
Annelida.
Fill in the blank: Arthropods have an exoskeleton made of __________.
chitin.
What is the primary habitat of most sponges?
Aquatic environments.
What is a key characteristic of nematodes?
They have a cylindrical body shape.
Which invertebrate group is known for their complex nervous system and behavioral patterns?
Cephalopods.
True or False: Invertebrates can be found in both marine and terrestrial environments.
True.
What is the role of a mantle in mollusks?
It secretes the shell and aids in respiration.
Name one type of echinoderm.
Starfish.
What is the defining characteristic of poriferans?
They are porous and lack true tissues.
Fill in the blank: __________ are known for their ability to regenerate body parts.
Starfish.
What is an example of a crustacean?
Crab.
True or False: Invertebrates can exhibit both sexual and asexual reproduction.
True.
Which invertebrate group has a soft body and is often protected by a shell?
Mollusks.
What is the main function of the water vascular system in echinoderms?
Locomotion and feeding.
What type of organism is a hydrozoan?
A type of cnidarian.
Fill in the blank: __________ are commonly known for their segmented bodies and jointed appendages.
Arthropods.
What type of symmetry do most adult echinoderms exhibit?
Pentaradial symmetry.
True or False: All invertebrates are small in size.
False.
What is the main characteristic of the phylum Platyhelminthes?
They are flatworms.
Name one method of locomotion used by cnidarians.
Jet propulsion.
What is the defining feature of the phylum Nematoda?
They have a round body and a complete digestive system.
Fill in the blank: __________ are known for their segmented bodies and include polychaetes and oligochaetes.
Annelids.
What type of circulatory system do most mollusks have?
Open circulatory system.
True or False: Arthropods undergo metamorphosis.
True.
What is the primary body feature of sponges?
They have a porous structure.
Name a function of the exoskeleton in arthropods.
Protection and support.
How do most annelids breathe?
Through their skin or gills.
