Invertebrates
What distinguishes sessile organisms from motile ones?
What characteristic defines Porifera Phylum?
They are sponges.
Most sponges have what type of symmetry?
Asymmetrical
How would you best describe the habitat of the phylum Cnidaria?
Mostly marine with a some organisms (hydras) being freshwater.
What are the 4 classes of Cnidaria?
Anthozoa, Scyphozoa, Cubozoa, and Hydrozoa.
Which type of circulation is NOT contained in vessels?
Open circulation
Porifera are considered simple because they lack ____.
Which method of reproduction in sponges involves the release of male gametes into the water?
Sexual reproduction
What type of symmetry do Cnidarians exhibit?
Radial
Anthozoa are the ___________ class.
largest
Which phylum includes animals like sea stars and sea urchins?
Echinodermata
How many species of sponges are there?
More than 5000 species.
Which cell types in sponges is responsible for capturing food?
Choanocytes (collar cells)
Polyps are sessile (attached to a surface and don't move) and medusas are motile.
700 million years
Which phylum includes animals like octopuses and clams?
Mollusca
What is the primary feeding method for sponges?
Filter feeding.
What is the term for the asexual reproduction method where new sponges are form from detached portions?
Budding
The cnidocyte cells of Cnidaria contain nematocysts which can be described as:
A coiled, harpoon-like stinger.
Which class of Cnidarians is considered the most dangerous to humans?
Cubozoa, the sea wasp can kill a human in 2-5 minutes with its venom.
What distinguishes the phylum Arthropoda from other invertebrate phyla?
They have jointed appendages.
They are multicellular, heterotrophs, and have structural organization.
How do sponges deal with the problem of getting clogged with debris?
They secrete mucus and mutualistic relationship with sea worms or sea cucumbers.
What is the primary function of the body stalk in polyp forms?
Attachment to substrate (surface).
What is the primary form or existence for the Hydrozoa?
Exist only as polyps.