Ch. 33 Inverterbrates Flashcards
An animal that lacks a backbone
Invertebrates
What does it mean to say that sponges are a basal clade of animals?
Sponges lack tissues but still do all the things that animals do
In what environment would you find most sponges?
Marine environments
Adult sponges are ______________ (do not move).
Sedentary
Sponge cells work mostly individually, which is why sponges are said to lack _______________.
Tissues
Describe the process by which sponges obtain food
Sponges obtain food by filtering water in through the spongocelium and letting it exit through the osculum.
Types of cells found in sponges
Choanocyte — flegellates to generate water flow
Amebocytes — ameobia like cell that delivers food to other cells of the sponge
In terms of reproduction, most sponges are _________________.
Hermaphrodites
What is the name of the digestive organ in sponges?
Sponges don’t have a digestive organ.
Cnidarians have ___________________ symmetry.
Radial
- The two body forms of cnidarians are _____________ and _____________.
I.) polyp
2.) medusa
What two types of tissues are found in cnidarians that allow for response to the environment and coordinated movement?
Nervous and muscular tissue
What role do most cnidarians play in their local food chain?
Predators
cnidocytes
Unique cells for hunting prey specifically; contain harpoon like orgenells called nematophytes
Explain why it is beneficial for flatworms to be flat and what processes can occur simply by diffusion across their body surfaces.
Flat worms are flat in order to withstand pressure from the ocean.
The range of environments where flatworms can be found.
Salt water or fresh water
