Nemerteans:

• only reproduce sexually
• undergo complete metamorphosis during development
• are monoeocious
• undergo spiral cleavage during development

undergo spiral cleavage during development

The worm that causes trichinosis after consuming undercooked pork is a:

• segmented worm
• flatworm
• roundworm

roundworm

Mollusks:

• comprise about 1/4 of all marine species
• can be bilaterally or radially symmetrical
• are identifiable since they all have shells
• live in marine environments

comprise about 1/4 of all marine species

The earthworm

• is a coelomate
• contains both male and female reproductive systems
• has segmentation
• all of the above are true

all of the above are true

Which of these are NOT a mollusk?

• snail
• scallop
• octopus
• anemone

anemone

Planaria (a species that is categorized in Phylum Platyhelminthes)

• has one opening that serves as both the mouth and the anus
• is radially symmetrical
• only can reproduce sexually, not asexually
• is parasitic

has one opening that serves as both the mouth and the anus

Arthropoda are characterized by

• body segmentation
• an exoskeleton made of chitin
• jointed appendanges
• all of the above are true

all of the above are true

Planaria (a species found in phylum Platyhelminthes)

• has a circulatory and respiratory system that moves oxygen throughout its body
• is hermaphroditic (has both male and female reproductive system
• responds to chemical stimuli, but not light stimuli
• is also called a roundworm

is hermaphroditic (has both male and female reproductive system

Sea urchins are found in what Class of Echinoderms?

• Ophiuroidea
• Echinoidea
• Asteroidea
• Crinoidea

Echinoidea

Which of the following is true?

• Sponges are unique to the animal kingdom as they are sessile (not-motile and never move about) for their entire lives.
• Sponges are unique to the animal kingdom as they are multicellular but do not have specialized tissues
• Since sponges are animals, they follow homologous embryo development processes
• Since sponges are animals, they go through gastrulation and produce three true germ layers

Since sponges are animals, they go through gastrulation and produce three true germ layers

Which of the following is NOT a cnidarian?

• sea cucumber
• coral
• jellyfish
• hydra

sea cucumber

Annelids and mollusks are similar in that they

• only contain dioecious species
• only exist in marine environments
• derive from three germ layers (endoderm, mesoderm, ectoderm)
• can be bilaterally or radially symmetrical

derive from three germ layers (endoderm, mesoderm, ectoderm)

Which of the following is true?

• Cnidarians have both a sexual form and different asexual form
• Cnidarian medusa and polyp forms are both diploid
• Cnidarian have two true germ layers - the endoderm and ecotoderm
• All of the above are true

All of the above are true

The phylum with the most known species is

• Arthropoda
• Annelida
• Mollusca
• Chordata

Arthropoda

Sponges exhibit what type of symmetry?

• radial
• bilateral
• mirror
• they do not exhibit symmetry

they do not exhibit symmetry

Platyhelminthes exhibit what type of body plan?

• acoelomate
• coelomate
• pseudocoelomate
• eucoelomate

acoelomate

Phylum Nematoda (roundworms)

• are pseudocoelomates
• exhibit segmentation
• are radially symmetrical
• are always monoecious

are pseudocoelomates

The sea star has a water vascular system. The water will enter the sea star through the

• madreporite
• papulae
• tube feet
• stone canal

madreporite

Spiders are found in subphylum

• Insecta
• Hexapoda
• Chelicerata
• Arachnida

Chelicerata