Mid-Sem Exam: Characteristics of Poriferans, Cnidarians, Platyhelminthes, Nematodes and Annelids

Question 1

What type of symmetry is typical of phylum Porifera?

Answer 1

Asymmetry

Question 2

What type of symmetry is typical of phylum Cnidaria?

Answer 2

Radial symmetry

Question 3

What type of symmetry is typical of phylum Platyhelminthes?

Answer 3

Bilateral symmetry

Question 4

What type of symmetry is typical of phylum Nematoda?

Answer 4

Bilateral symmetry

Question 5

What type of symmetry is typical of phylum Annelida?

Answer 5

Bilateral symmetry

Question 6

Are Poriferans acoelomates, pseudocoelomates, or eucoelomates?

Answer 6

Acoelomate (has no coelom)

Question 7

Are Cnidarians acoelomates, pseudocoelomates, or eucoelomates?

Answer 7

Acoelomate (has no coelom)

Question 8

Are Platyhelminthes acoelomates, pseudocoelomates, or eucoelomates?

Answer 8

Acoelomate (has no coelom)

Question 9

Are Nematodes acoelomates, pseudocoelomates, or eucoelomates?

Answer 9

Pseudocoelomate (have a body cavity that is not a true coelom, as it is not derived from mesoderm)

Question 10

Are Annelids acoelomates, pseudocoelomates, or eucoelomates?

Answer 10

Eucoelomate/coelomate (have true coeloms derived from middle germ layer)

Question 11

Which of the phylum studied in the first five weeks have true tissues?

Answer 11

Cnidaria, Platyhelminthes, Nematoda, Annelida (and Ctenophora)

Question 12

What is the typical feeding behaviour of Poriferans?

Answer 12

Filter feeding (sessile); exception of predatory harp sponge

Question 13

What is the typical feeding behaviour of Cnidarians?

Answer 13

Mostly predatory, carnivorous (either by using stinging cells or filter-feeding)

Question 14

What is the typical feeding behaviour of Platyhelminthes?

Answer 14

Mostly parasitic. Some are predators (e.g. free-living planarians)

Question 15

What is the typical feeding behaviour of Nematodes?

Answer 15

Mostly parasitic, some free-living eat yeast/bacteria (vinegar eels)

Question 16

What are the three types of worms (those studied) and their respective phyla?

Answer 16

Flatworms (Platyhelminthes), roundworms (Nematoda) and segmented worms (Annelida)

Question 17

What is the typical feeding behaviour of Annelids?

Answer 17

Highly diverse; may be predators, parasites, filter feeders, detritivores etc.

Question 18

What reproductive methods are typical of phylum Porifera?

Answer 18

Hermaphrodites; may reproduce asexually by fission (budding) or sexually

Question 19

What reproductive methods are typical of phylum Cnidaria?

Answer 19

Sexual and asexual reproduction (budding), some dioecious, hermaphroditism in some species

Question 20

What reproductive methods are typical of phylum Platyhelminthes?

Answer 20

Hermaphroditism; sexual or asexual (fission), both partners may fertilise one another during an encounter (cross-fertilisation)

Question 21

What reproductive methods are typical of phylum Nematoda?

Answer 21

Some hermaphroditism, most separated into sexes; asexual (fission) and sexual reproduction

Question 22

What reproductive methods are typical of phylum Annelida?

Answer 22

Mostly dioecious, some hermaphroditism; sexual, some asexual (budding, fission)

Question 23

Are Poriferans protostomes, deuterostomes, or neither?

Answer 23

Neither (no mouth or anus)

Question 24

Are Cnidarians protostomes, deuterostomes, or neither?

Answer 24

Neither (cnidarians have one orifice that serves as both a mouth and anus)

Question 25

Are Platyhelminthes protostomes, deuterostomes, or neither?

Answer 25

Protostomes (mouth first)

Question 26

Are Nematodes protostomes, deuterostomes, or neither?

Answer 26

Protostomes (mouth first)

Question 27

Are Annelids protostomes, deuterostomes, or neither?

Answer 27

Protostomes (mouth first)

Question 28

What are the three main classes of sponges (Poriferans)?

Answer 28

Demospongiae, Homoscleromorpha, Calcarea

Question 29

What are the four main classes of Cnidarians?

Answer 29

Cubozoa, Scyphozoa, Anthozoa, Hydrozoa. (Also; Myxozoa, myoliquefaction)

Question 30

What are the four main types of Platyhelminthes?

Answer 30

Turbellaria (planarians), Trematoda (liver flukes), Monogenea (ectoparasites), Cestoda (tapeworms).

Question 31

What are the three main classes of Annelids?

Answer 31

1. Polychaeta (bristle worms) 2. Oligochaeta (earthworms) 3. Hirudinea (leeches)

Question 32

Adult body form: Poriferans

Answer 32

Asymmetric; asconoid, syconoid, leuconoid

Question 33

Adult body form: Cnidarians

Answer 33

Radial; medusa, polyp

Question 34

Adult body form: Platyhelminthes

Answer 34

Bilateral; flatworms

Question 35

Adult body form: Nematodes

Answer 35

Bilateral; roundworms

Question 36

Adult body form: Annelids

Answer 36

Bilateral; segmented worms

Question 37

Germ layers: Poriferans

Answer 37

Monoblastic; one

Question 38

Germ layers: Cnidarians

Answer 38

Diploblastic; two

Question 39

Germ layers: Platyhelminthes

Answer 39

Triploblastic; three

Question 40

Germ layers: Nematodes

Answer 40

Tribloblastic; three

Question 41

Germ layers: Annelids

Answer 41

Triploblastic; three