Invertebrates - Intro & Porifera

Question 1

what are invertebrates?

Answer 1

-animals that lack a backbone
-believed to account for 95% of all animal species

Question 2

what are the characteristics of the phylum porifera?

Answer 2

-asymmetrical sponges
-suspension feeders with no true tissues
-found in marine and fresh waters, sessile

Question 3

how do poriferas feed?

Answer 3

-water moves in through porocytes [small muscular cell openings], and food particles in the water are collected

Question 4

what are the 3 types of porifera cells?

Answer 4

choanocytes - collar cells
amoebocytes - transport nutrients, make spicules, can become any type of cell
spicules - make skeletal fibers

Question 5

how do poriferas reproduce and what type of sexual reproduction do they use?

Answer 5

-can reproduce sexually by releasing spores
-can reproduce asexually by budding
-most sponges are hermaphroditic: produces male and female gametes

Question 6

what invertebrate phyla are acoelomate?

Answer 6

platyhelminthes
cnidaria
porifera

Question 7

what invertebrate phyla are coelomate?

Answer 7

molluscs
chordates
annelids
echidnoderms

Question 8

which invertebrate phyla are pseudocoelomate?

Answer 8

nematoda
rotifera