Practical #1 Exam: Porifera and Cnidaria Flashcards
1
Q
What phylum do sponges fall under?
A
Porifera
2
Q
Characteristics of Portifera
A
- cellular level of organization
- multicellular
- cells don’t quite fit the definition of tissue
- filter feeding through pores and canals
- skeleton made of spicules and spongin
- have special cells lining their canals called
choanocytes for feeding and moving water - mutualistic (both benefiting)
symbiotic relationship with algae - sponges get food (glucose) from the photosynthesizing
algae - algae gets protection from the sponge
3
Q
Pores
A
- ostia
-osculum
4
Q
Canals
A
- spongocoel
- radial canals
5
Q
Path of Water Through Sponges
A
Ostia → Radial Canal → Spongocoel → Osculum
6
Q
What are Choanocytes?
A
- the lining that is the inside of the sponge
- single, flagellated cells
- flagella move in the water which create water flow
- cells filter out nutrients from the water
7
Q
Types of Sponges
A
- asconoid
- syconoid
- leuconoid
8
Q
Asconoid Sponges
A
- don’t have radial canals (ostia → spongocoel → osculum).
9
Q
Synconoid Sponges
A
- have radial canals that all connect to the spongocoel
10
Q
Leuconiod
A
- have a network of canals and a very small spongocoel.
11
Q
What is the phylum for corals, anemones and jellyfish?
A
Cnidaria
12
Q
Phylum Cnidaria Characteristics
A
-radial symmetry
-tissue level of organization
-diploblastic (2 tissue layers)
-have a gastrovascular cavity
-have cnidocytes on their tentacle that contain nematocysts
-usually have 2 types of body form, polyp and medusa
13
Q
What is Diploblastic tissue?
A
- epidermis
- gastroderm
14
Q
Cnidocytes
A
cells
15
Q
Nematocysts
A
- stinging organelles
- type of cnidocyte
- covered by operculum (cover/flap)
-triggered by cnidocil (modified cilium)
-threadlike filament injects venom when contacts prey/threat - once fired, cannot be reloaded
-the cell is reabsorbed and replaced