Bio Lab 8 - Porifera and Cnidaria

Question 1

Types of symmetry

Answer 1

Asymetric
Radial
Bilateral

Question 2

Phylum Porifera

Answer 2

Sponges
Cellular organization (no tissues)
Asymetric
Made of:
-Spongin (collagen)
-Spicules (silica/calcium)

Question 3

Internal - Phylum Porifera

Answer 3

Flagella brings water in 
-through dermal ostia
-through radial canals
-into spongocoel
-out osculum on top
Nutrients collected by choanocytes
Digested by amoebocytes
Eats poop and dead stuff

Question 4

Body Complexity

Answer 4

Asconoid - simple tubular
Syconoid - lateral canals
Leuconoid - many chambers, most sponges

Question 5

Classes of Porifera

Answer 5

Class Calcarea:
-small
-shallow
-CaCO3 spicules, needle like
Class Hexactinellida
-synconoid of leuconoid
-6 rayed spicules
Class Demospongiae
-all leuconoid
-silica spicules, not 6-rayed

Question 6

Porifera Sexual Reproduction

Answer 6

Hermaphroditic

Sperm released through osculum, collected by choanocytes, delivered to radial canals

Question 7

Porifiera Asexual Reproduction

Answer 7

Budding - grow off parent

Gemmules - amoebocytes in spongin and spicules

Question 8

Phlyum Cnidaria

Answer 8

Marine
Tissue organizations
Incomplete digestive tract - just cavity
Diploblastic (endo and ectoderm)
Tentacles
-Cnidocyte: stinging
-Nematocyte: coiled, harpoon like, neurotoxic

Question 9

Cnidaria body

Answer 9

Layers:
-Epidermis: outer
-Gastrodermis: inner, digestive
-Mesoglea: between epi and gastro
Form:
-Polyp: sessile trunk, asexual, dominant
-Medusa: free swimming, umbrella body, sexual, tentacles

Question 10

Class Hydrozoa

Answer 10

of Phylum Cnidaria
Polyp dominant
Genus Hydra: lack medusa, small
Genus Obelia: see other card
Genus Physalia: colonial, polymorphic

Question 11

Genus Obelia

Answer 11

of Phylum Cnidaria, Class Hydrozoa
Polyp has 2 forms:
-Gastrozoid: feeding
-Gonozoid: reproductive
Mature medusa produces gametes

Question 12

Genus Physalia

Answer 12

of Phylum Cnidaria, Class Hydrozoa
Colonial
Polymorphic
4 Polyp types
-Pheumatiophore: gas filled "sail"
-Dactylozooid: defense
-Gastrozoid: digestion
-Gonozooid: reproduction

Question 13

Class Scyphozoa

Answer 13

of Phylum Cnidaria
Jellyfish
Medusa-dominant
Genus Aurelia
-typical jellyfish
-ciliated oral arms to gather food
-sensing "organs"
-gametes become planula larvae which anchors to substrates, becomes ephyra, becomes medusa (see picture)

Question 14

Class Anthozoa

Answer 14

of Phylum Cnidaria
corals
Colonial
Polyp-dominant