Bio 204 - Lab 9
What group of organisms may Choanoflagellate
likely be the closest relative to
Animals?
Name 2 apomorphies for the Multicellularity with division of labor and collagen
Animalia
Name 2 apomorphies for An aquiferous system and skeleton of spicules
Porifera
Water is drawn through tiny holes (ostia) and filtered out of
How does the aquiferous large holes (oscula) by the choanocyte cells that are
system in Poriferans work? imbedded in the mesohyl. As water is drawn in, food
Explain in detail particles are captured in the mucus of the collar which then
gets engulfed by the cell and digested.
What structures and/or They are made up of spicules, which are fibers of calcium
materials make up the and/or silica or spongin (collagen-based protein)
skeletal system of poriferans?
1) Animals have true tissues and these tissues will perform
specific functions (poriferans lack true tissues, so they have
Name and describe all TOTIPOTENT cells)
apomorphies that unite all 2) 2 germ layers - endoderm and ectoderm
animals other than Porifera 3) Gastrovascular cavity - digestive tract with one opening
for mouth AND anus
4) Nervous system
Name an apomorphy for Cnidae - stinging or adhesive cells produced by cnidocyte
Cnidaria **most common one is the nematocyst (stinging cell)
Why do you think radial Because the sessile animals exhibit equal symmetry in all
symmetry is common in planes
sessile animals?
What does budding mean in Asexual reproduction - the polyp produces the medusa and
reference to Cnidarians? the medusa breaks off (aka buds) from the colony
1/2
What group of organisms may Choanoflagellate
likely be the closest relative to
Animals?
Name 2 apomorphies for the Multicellularity with division of labor and collagen
Animalia
Name 2 apomorphies for An aquiferous system and skeleton of spicules
Porifera
Water is drawn through tiny holes (ostia) and filtered out of
How does the aquiferous large holes (oscula) by the choanocyte cells that are
system in Poriferans work? imbedded in the mesohyl. As water is drawn in, food
Explain in detail particles are captured in the mucus of the collar which then
gets engulfed by the cell and digested.
What structures and/or They are made up of spicules, which are fibers of calcium
materials make up the and/or silica or spongin (collagen-based protein)
skeletal system of poriferans?
1) Animals have true tissues and these tissues will perform
specific functions (poriferans lack true tissues, so they have
Name and describe all TOTIPOTENT cells)
apomorphies that unite all 2) 2 germ layers - endoderm and ectoderm
animals other than Porifera 3) Gastrovascular cavity - digestive tract with one opening
for mouth AND anus
4) Nervous system
Name an apomorphy for Cnidae - stinging or adhesive cells produced by cnidocyte
Cnidaria **most common one is the nematocyst (stinging cell)
Why do you think radial Because the sessile animals exhibit equal symmetry in all
symmetry is common in planes
sessile animals?
What does budding mean in Asexual reproduction - the polyp produces the medusa and
reference to Cnidarians? the medusa breaks off (aka buds) from the colony
1/2
