Chpt 33 Hmwk

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One should expect to find cilia associated with the feeding apparatus of _____.
coral animals


Which of the following is a characteristic of cnidarians?
an anus
bilateral symmetry
gastrovascular cavity

gastrovascular cavity

Which of the following is characteristic of the phylum Platyhelminthes?
They are radially symmetrical.
They are diploblastic.
They typically reproduce asexually.
They are dorsoventrally flattened.
They are all parasitic.

they are dorsoventrally flattened

Members of the phylum Mollusca _____.
have segmented bodies and paired, jointed appendages
have tentacles surrounding a central mouth/anus
are filter feeders
have closed circulatory systems
are soft-bodied and often covered by a shell

are soft bodied and often covered by a shell

Nematodes and arthropods both _____.
are suspension feeders
develop an anus from the blastopore (pore) formed in the gastrula stage
have ciliated larvae
grow by shedding their exoskeleton

grow by shedding their exoskeleton

Which of the following are thought to be most closely related to humans?
sea stars

sea stars

Select the correct statement(s) about invertebrate taxa.

Ectoprocts lack a distinct head.
Tapeworms lack a mouth and gastrovascular cavity.
Rotifers are smaller than many protists.

Ectoprocts lack a distinct head tapeworms lack a mouth and gastrovascular cavity rotifers are smaller than many protists

What evidence suggests that vertebrates are more closely related to echinoderms than are any other invertebrate phyla?

Shared morphology
Shared DNA sequences
Shared patterns of development

shared DNA sequences

Which phylum is characterized by animals that have a segmented body?



Which of the following combinations of phylum and description is incorrect?

Echinodermata-bilateral symmetry as a larva, coelom present

Platyhelminthes-flatworms, gastrovascular cavity, acoelomate

Porifera-gastrovascular cavity, coelom present

Cnidaria-radial symmetry, polyp and medusa body forms

Nematoda-roundworms, pseudocoelomate

Porifera – gastrovascular cavity, coelom present

Nematodes and arthropods are the largest ecdysozoan phyla.

Which of the following statements are true?

Arthropods possess an open circulatory system.
Both nematodes and arthropods possess an external covering, or cuticle.
Nematodes are acoelomate, whereas arthropods are coelomate.
The cuticle in nematodes lengthens as the animal grows.
Both nematodes and arthropods must molt in order to increase in size.
Some nematodes are parasitic on humans.
Arthropods are named for their jointed appendages.
Both nematodes and arthropods have segmented body plans.
Nematodes possess a closed circulatory system.

Arthropods possess an open circulatory system both nematodes and arthropods possess an external covering, a cuticle both nematodes and arthropods must mold in order to increase in size some nematodes are parasitic on humans arthropods are named for their jointed appendages

Characterize the cheliceriform lineage of the phylum Arthropoda

horseshoe crab, possess clawlike feeding appendages, arachnids

Characterize the myriapod lineage of the phylum Arthropoda

millipedes and centipedes, exclusively terrestrial

Characterize the insect lineage of the phylum Arthropoda

butterfly; body divided into head, thorax, and abdomen; wings allow flight; three pairs of walking legs

Characterize the crustaceans lineage of the phylum Arthropoda

crabs and isopods, primarily aquatic, two pairs of antennae

Characterize the insect order Coleoptera

hard forewings protect membranous hindwings; complete metamorphosis; beetles

Characterize the insect order Diptera

hindwings reduced to stabilizers; complete metamorphosis; flies

Characterize the insect order Hemiptera

thick forewings (except at tips); incomplete metamorphosis; "true bugs"

Characterize the insect order Hymenoptera

membranous forewings and hindwings; complete metamorphosis; ants, bees and wasps

Characterize the insect order Lepidoptera

wings have scales; complete metamorphosis; butterflies and moths

Characterize the insect order Orthoptera

one pair leathery, one pair membranous; incomplete metamorphosis; grasshopers and crickets

Characterize the insect order Trichoptera

hairy wings; complete metamorphosis; caddisflies

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