phylum porifera Flashcards
1
Q
what characteristics do sponges have?
A
porous, sessile, filter feeders
2
Q
how many layers do sponges consist of?
A
2
3
Q
how are gas and waste removed?
A
simple diffusion
4
Q
what are the osculum, spongocoel, and porocytes?
A
1) where water exits
2) the interior space
3) cells where water enters
5
Q
what are choanocytes?
A
flagellated cells with collars that aid in filter feeding
6
Q
what do amoebocytes do?
A
they take up food and carry nutrients to other cells and manufacture skeletal fibers
7
Q
what is special about ameobocytes?
A
they are totipotent so can give rise to any cell type within organism
8
Q
how does fertilization occur?
A
sperm and eggs are released from sponge oscula for external fertilization (some undergo asexual reproduction)
