lecture 3 invertebrates

Question 1

three types of body symmetry

Answer 1

asymmetric
radial
bilateral

Question 2

three types of body cavity

Answer 2

acoelomates
coelomates
pseudocoelomates

Question 3

characteristics of acoelomates

Answer 3

no enclosed body cavity

Question 4

characteristics of coelomates

Answer 4

internal cavity, organs surrounded by mesoderm

Question 5

characteristics of psudocoelomates

Answer 5

internal cavity, organs NOT surrounded by mesoderm

Question 6

“mouth develops from blastopore” protosome or deuterosomes

Answer 6

protosomes

Question 7

“anus develops from blastopore” protosome of deuterosome

Answer 7

deuterosome

Question 8

what are protosomes

Answer 8

mollusks annelids arthropods

Question 9

what are deuterosomes

Answer 9

echinoderms, chordates

Question 10

what does the phylum name porifera mean in latin

Answer 10

pore bearing

Question 11

porifera sessile or not

Answer 11

sessile but with free swimming larvae

Question 12

porifera true organ/tissues or not

Answer 12

not

Question 13

porifera type of symettry

Answer 13

asymetric (some radial)

Question 14

porifera sex?

Answer 14

mostly hermaphrodites

Question 15

what does the phylum cnidaria mean in latin

Answer 15

stinging

cnida = nettle

Question 16

cnidaria sessile or not

Answer 16

two forms sessile polyps & mobile medusae

Question 17

cnidaria symmetry type

Answer 17

radial

Question 18

cnidaria (a)coelomates?

Answer 18

Acoelomates

Question 19

how many cell layers do cnidaria have and what are they

Answer 19

Two cell layers: epidermis & gastrodermis`

Question 20

cnidaria sex

Answer 20

polyps = asexual
medusae = reproduction

Question 21

cnidaria special feature

Answer 21

stinging cells called cnidocytes

Question 22

what are the three classes of cnidaria

Answer 22

hydrozoa
scyphozoa & cubozoa
anthozoa

Question 23

what does the phylum platyhelminthes mean in latin

Answer 23

flat worms

Question 24

some example species in platyhelminthes

Answer 24

flatworms
flukes
tapeworms

Question 25

platyhelminthes symmetry type

Answer 25

bilateral

Question 26

are platyhelminthes (a)coelomates

Answer 26

acoelomates

Question 27

platyhelminthes digestion system what is it like

Answer 27

simple mouth, no anus

Question 28

what is the third cell layer that pltyhelminthes has

Answer 28

parenchyma

Question 29

platyhelminthes sex?

Answer 29

hermaphrodites sexualy reproducing

Question 30

four classes of platyhelminthes

Answer 30

tubellaria
trematoda
cestoda
monogenea

Question 31

adaptations to parasitic life: size?

Answer 31

small, flat, cylindrical

Question 32

adaptations to parasitic life: attachment organs

Answer 32

they have them

Question 33

adaptations to respiration

Answer 33

anaerobic

Question 34

adaptations to parasitic lif: reproduction

Answer 34

asexual

Question 35

Possible advantages of infecting secondary & tertiary hosts

Answer 35

increased reproductive potential
increased range of the parasite in space and time
intermediate host can promote infection of definitive host

Question 36

what are all animals

Answer 36

multicellular (no cell wall), mobile, heterotrophic, w/ specialised cells organised into tissues

Question 37

what are animal groups characterised by

Answer 37

their body plans & development (which reflect ancestry)

Question 38

what are the oldest group of animals

Answer 38

porifera

lacking true tissues, organs or symmetry

Question 39

which groups are acoelomates

Answer 39

Cnidaria (sting cells, radial symm) & Platyhelminthes (flatworms, bilateral symm)