What is metamorphosis?
complete morphological change from larva to adult
Is this the dorsal or ventral side of this fish?
ventral
What is an osculum?
A large opening on a sponge through which filtered water is expelled
What are gills?
Extensions of the body containing thin-walled blood vessels that allow for the absorption of oxygen from the outside surface
What kind of support do small sponges, larger sponges and very large sponges use for support?
small use spongin, larger use a network of spicules and the very large us both
Do the sponges we use in our bath use spicules or spongin for support? why?
spongin because spicules are stiff and sharp, and would scratch things
How do sponges reproduce asexually?
1. budding or having a piece broken off, or 2. gemmule.(a group of cells surrounded by a protective coat of spicules)
When does a sponge produce a gemule? Why?
When the environment is harsh(water too hot, or too cold or pollution) , and the sponges may die
Do sponges demonstrate metamorphosis?
Yes during sexual reproduction, when they change from the parenchymal larva which is planktonic into a mature sponge which is attached to a substrate.
What is a parasite and name 2.
An organism that live in or on another organism (host) and benefits by deriving nutrients at the host's expense. Tapeworms, fluke, roundworms
How do tapeworms get their nutrients?
They absorb nutrients through their skin from the digestive tract of the host. They have no gut or mouth, and rely on the host to digest the food for them
What is the crown of ciliated tentacles used for feeding called?
Lophophorate
Nematoda are the cause of people who eat raw fish, getting sick. How does this happen? What are they?
round worms, Their larvae usually live in host fishes and grow to adults in the intestine of vertebrates after the vertebrate that eat the fish
What is the difference between a polyp and a medusa?
a polyp-an attached Cnidarian stage appearing sac like or barrel like. Medusa- a free swimming Cnidarian stage, appearing bell like or umbrella like
