Classification of Invertebrates and Vertebrates

Questions and Answers

What is an invertebrate?

Animals with no backbone (correct)

Aquatic animals

Animals with backbones

Animals that lay eggs

What are vertebrates?

Animals with backbones

What are sponges?

Aquatic animals that obtain food through filter feeding

What are segmented worms?

Invertebrates with long bodies in sections that take in oxygen through skin and live underground Signup and view all the answers

What are echinoderms?

Animals that have arms that extend from the middle body and have tube feet Signup and view all the answers

What are roundworms?

Cylinder-shaped invertebrates with pointed ends, most numerous and widespread Signup and view all the answers

Which of the following are examples of echinoderms?

Sea stars Signup and view all the answers

What are mollusks?

Animals with soft bodies and a thick muscular foot Signup and view all the answers

Which of the following are examples of mollusks?

Snails Signup and view all the answers

What defines arthropods?

Have jointed legs, segmented bodies, exoskeletons Signup and view all the answers

Which of the following are examples of arthropods?

Insects Signup and view all the answers

Ectothermic animals maintain a constant body temperature.

False Signup and view all the answers

What are fish?

Ectothermic (cold-blooded) animals that get oxygen with gills Signup and view all the answers

What are amphibians?

Ectothermic (cold-blooded) animals that breathe with gills when young and lungs when adults Signup and view all the answers

Which of the following are examples of amphibians?

Salamanders Signup and view all the answers

What are reptiles?

Ectothermic (cold-blooded) animals that breathe with lungs and lay tough leathery eggs Signup and view all the answers

Which of the following are examples of reptiles?

Turtles Signup and view all the answers

What are birds?

Endothermic (warm-blooded) animals with feathers and beaks Signup and view all the answers

Which of the following are examples of birds?

Eagles Signup and view all the answers

What are mammals?

Endothermic (warm-blooded) animals that produce milk for their young Signup and view all the answers

Which of the following are examples of mammals?

Whales Signup and view all the answers

What types of animals get oxygen through gills?

Fish and young amphibians Signup and view all the answers

What types of animals get oxygen through lungs?

Reptiles, birds, and mammals Signup and view all the answers

Only mammals produce milk for their young.

True Signup and view all the answers

How do mollusks move?

Using a muscular foot or jet propulsion Signup and view all the answers

How do arthropods move?

Using jointed legs or wings Signup and view all the answers

What are downy feathers used for?

To help birds stay warm Signup and view all the answers

Asymmetrical animals have symmetry.

False Signup and view all the answers

What defines bilateral symmetry?

A body plan in which only a single, imaginary line can divide the body into two equal halves Signup and view all the answers

What defines radial symmetry?

A body plan in which body parts repeat around the center of the body Signup and view all the answers

What are pores in sponges?

Holes that allow oxygen in the water to move through Signup and view all the answers

What are cnidarians?

Invertebrates that have stinging cells to capture food Signup and view all the answers

Which of the following are examples of cnidarians?

Corals Signup and view all the answers

What are flatworms?

Flat parasites that live inside or on another organism or live freely Signup and view all the answers

What are crustaceans?

Arthropods with exoskeletons and soft bodies with sections Signup and view all the answers

Which of the following are examples of crustaceans?

Lobster Signup and view all the answers

What defines centipedes?

Invertebrates with segmented bodies and one pair of legs per segment Signup and view all the answers

What are millipedes?

Arthropods with two pairs of legs for each body segment Signup and view all the answers

Study Notes

Invertebrates

Invertebrates lack a backbone and represent a diverse group of animals.
Sponges are aquatic organisms that obtain food through filter feeding.
Segmented worms have elongated, sectioned bodies and respire through their skin, commonly found underground.
Echinoderms possess arms radiating from a central body and utilize tube feet for movement.
Roundworms, characterized by cylindrical shapes with pointed ends, are the most numerous and widespread of all animals.
Examples of echinoderms include sea stars, sea cucumbers, and sea urchins.
Mollusks have soft bodies, often equipped with a muscular foot, and can be categorized into gastropods, bivalves, or cephalopods.
Mollusk examples include snails, slugs, octopuses, clams, and squids.
Arthropods feature jointed legs and segmented bodies, equipped with exoskeletons and respiratory systems using gills or air tubes.
Examples of arthropods include insects, arachnids, crustaceans, and centipedes/millipedes.
Cnidarians, equipped with stinging cells for capturing prey, include jellyfish, corals, and sea anemones.
Flatworms are flat-bodied parasites that can live on other organisms or freely in damp environments.
Crustaceans are arthropods that possess exoskeletons and gills, including shrimp, crabs, crayfish, lobsters, and krill.
Centipedes have segmented bodies with one pair of legs per segment, are carnivorous, and possess venomous claws.
Millipedes feature two pairs of legs per segment and primarily feed on decaying plant matter.

Vertebrates

Vertebrates have backbones and are classified into ectothermic and endothermic groups.
Ectothermic vertebrates maintain a body temperature that fluctuates with their environment.
Fish are ectothermic, respiring via gills, laying eggs, and having fins and scales.
Amphibians also are ectothermic; they breathe with gills as juveniles and with lungs as adults, laying jelly-like eggs. Examples include frogs, toads, and salamanders.
Reptiles breathe with lungs, lay tough leathery eggs, and have scales; examples include snakes, alligators, turtles, and lizards.
Endothermic vertebrates maintain a constant body temperature irrespective of the environment.
Birds are endothermic, breathe using lungs, lay eggs with hard shells, and possess feathers, wings, and beaks; examples include pelicans, parrots, and eagles.
Mammals are endothermic, breathe with lungs, mostly give live birth, have fur or hair, and produce milk for their offspring; examples include humans, tigers, and whales.

Symmetry

Asymmetrical organisms, like ocean sponges, lack a symmetrical body plan.
Bilateral symmetry allows for a single line of division creating two equal halves.
Radial symmetry features body parts repeating around a central body axis, evident in organisms like sea stars.

Reproductive and Respiratory Adaptations

Gills are utilized by fish and young amphibians for oxygen exchange.
Lungs serve reptiles, birds, and mammals for respiration.
Only mammals produce milk to nourish their young.

Movement and Body Structure

Mollusks move using a muscular foot or through jet propulsion.
Arthropods typically move via jointed legs or wings.
Pores in sponges facilitate the intake of oxygen-rich water.

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Test your knowledge of the classification of animals with this flashcard set focusing on invertebrates and vertebrates. Learn definitions and examples of different animal groups, including sponges and segmented worms. Perfect for biology students looking to reinforce their understanding.