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Flashcards in Week 1 Deck (47)
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1

Where did animal life begin?

Water

2

How long ago did the first animals arise

about 570 million years ago

3

Many animal phyla originated during the ____ explosion

cambrian

4

The beginning of animal life originated from a single ____

protist

5

what are the nine major phyla we are studying (invertebrates)

Chordates, Echinoderms, Arthropods, Roundworms, Annelids, Mollusks, Flatworms, Cnidarians and Sponges :-)

6

What makes the split between sponges and the other clade>

Sponges have no true tissues

7

where is the second branching point between true tissues in the taxonomic tree

radial symmetry versus bilateral symmetry

8

radial symmetry has ___ germ layers whereas bilateral symmetry has ___ germ layers

two, three

9

Which phyla has radial symmetry?

Cnidarians

10

Three germ layers contains the _____, _____ and the _____

endoderm, ectoderm and the mesoderm

11

In all phyla except for sponges, the embryonic ball of cells called a _____ folds in on itself, forming a _____

blastula, gastrula

12

what distinguishes the third branching point in the phylogenetic tree

embryonic development

13

If the first indention of the gastrula develops into the mouth, the organism is a _______

protostome

14

If the first indention of the gastrula develops into the anus, the organism is a _______

deuterostome

15

What is a difference between Ecdysozoans and Lophotrochozoans?

Ecdysozoans shed their exoskeleton, Lophotrochozoans have a feeding structure called a lopophore

16

T or F: A bilaterally symmetrical animal can have a coelom, pseudocoelom or no coelom

T

17

what is a pseudocoelom

a ""false" coelom

18

what is a coelom

empty space or cavity that is covered by organs, helps us able to flex and bend

19

what is an incomplete digestive tract

the mouth both takes in food and ejects wastes

20

what is the term for repeated segments

metamerism

21

T or F: natural selection can act on segments separately in animals with segmented bodies

T, which leads to different species like crabs and lobsters

22

what are some advantages of segmented bodies

more flexible, have more potential for developing specialized body parts

23

What is the phylum Porifera

SPONGES!! :)

24

what are some characteristics of sponges

filter feeders: draw water through pores
collar cells with flagellum help sponges flow water inside
cephalization
asymmetrical

25

what is cephalization

has a distinct head

26

what is the pylum cnidaria

jellyfish, hydra, coral (all contain stinging cells)

27

what are some characteristics of cnidaria

cnidocytes are released in order to sting prey
incomplete digestion

28

what is the phylum flatworms

planiarns, flukes and tapeworms

29

what are some characteristics of flatworms

bilateral symmetry, when present digestive system incomplete

30

what is the phylum mollusca

snails, scallops and squids