Invertebrate Characteristics

Questions and Answers

All chordates have a backbone.

False

What is characteristic of an Aves (bird)?

Having a waterproof skin with feathers

Chordates have a ______________ running down the body.

notochord

Which of the following is NOT a characteristic of mammals?

Laying eggs Signup and view all the answers

What is the kingdom to which bacteria belong?

Prokaryotae Signup and view all the answers

Match the following kingdoms with their examples:

Kingdom Prokaryotae = Bacteria Kingdom Protoctista = Sargassum (seaweed) Kingdom Fungi = Pin mould on bread Kingdom Animalia = Snake, lizard, iguana, turtle Signup and view all the answers

All birds are homeothermic.

True Signup and view all the answers

Forelimbs of Aves are modified to form _______________.

wings Signup and view all the answers

What is characteristic of a mammal's teeth?

Different types of teeth Signup and view all the answers

Which of the following is a characteristic of chordates?

Having a dorsal nerve cord Signup and view all the answers

Study Notes

Arthropods

Have a waterproof exoskeleton made mainly of chitin
Have a segmented body
Have several pairs of jointed legs

Pisces (Fish)

Have a waterproof skin covered with scales
Have gills for breathing
Have fins for swimming
Examples: barracuda, flying fish, shark

Paraphrasing Molluscs

Have a soft, moist, unsegmented body
Have a muscular foot
Many have shells
Examples: slug, snail, octopus

Echinoderms

Have a body based on a radial pattern of five parts
Body wall contains calcium carbonate plates, often with projecting spines
Have tube feet with suction pads for movement
Examples: starfish, sand dollar, sea urchin

Amphibians

Have a soft, moist, non-waterproof skin without scales
Eggs are laid in water, larvae live in water, adults live on land
Larvae have gills, adults have lungs
Examples: frog, toad, newt

Reptiles

Have a dry, waterproof skin with scales
Lay eggs with a rubbery shell on land
Examples: barrel sponge, vase sponge

Arachnids

Have no antennae
Have four pairs of legs
Body is divided into cephalothorax and abdomen
Examples: spider, tick, scorpion

Cnidaria

Have a bag- or umbrella-shaped body
Gut has only one opening, the mouth
Have a ring of tentacles around the mouth
Examples: sea anemone, coral, jellyﬁsh

Platyhelminthes (Flatworms)

Have a long, flat, unsegmented body
Examples: tapeworm, liver fluke

Nematodes (Roundworms)

Have an elongated, round, unsegmented body with pointed ends
Examples: hookworm, threadworm

Annelids (Segmented Worms)

Have an elongated body divided into segments
Examples: earthworm

Chordates

Have a notochord (rod) running down the body
Most have a backbone
Have a dorsal nerve cord with the anterior end usually enlarged forming the brain
Most have an internal skeleton of bone and cartilage