Bio40s invertebrate Flashcards
(28 cards)
Give four characteristics most animals have.
- heterotrophic.
- eukaryotic cells.
- multicellular.
- most are motile.
Give two characteristics invertebrate animals have.
No backbone and varies.
Which phylums of animals have an exoskeleton?
phylum Arthropoda
list the three kinds of body symmetry. what is a sponges?
Bilateral, radial, asymmetrical.
Sponges have asymmetrical.
mature sponges live attached to one spot, referred to as being…..
remaining attached to one place is called sessle.
what structures provide support for sponges?
The spicule is small skeletal part for support
Name two body forms of cnidarians.
There is the polyp which is vase-shaped and medusa which is bell-shaped in free swimming
What type of symmetry do flatworms have?
They have bilateral symmetry.
Where are roundworms found?
they are found in waste, intestines and other organs within humans and animals.
List some parasitic roundworms that infect humans.
Trichina, filaria, pinworms and hookworms.
Which type of worms have a complete digestive tract with both mouth and anus?
Phylum Annelida (segmented worms)
List two similarities and two differences between roundworms and flatworms
Both have bilateral symmetry and a similar excretory system.
flatworms have incomplete digestive systems and roundworms have a complete digestive system. Flatworms are monoecious and roundworms are dioecious.
What causes the severe inflammation when Filaria attacks a human?
The worms live in the lymphatic system causing elephantiasis which blocks the lymph vessels. This causes swelling and damage throughout the body.
Describe three features in an earthworm that would indicate it is more advanced than a nematode.
It has a true body coelom, lateral blood vessels, and a nerve ganglion that is somewhat similar to a brain.
Name an organism found from each of the three major classes of mollusks.
Class Bivalvia: clams
Class Gastropoda: snails
Class Cephalopoda: squid
Where are mollusks found?
Found usually in aquatic regions and moist terrain.
List the parts of a squid.
External parts:
Fin, mantle, siphon, eye, tentacle, arm, sucker.
Internal parts:
Ink sac, siphon, radula, liver, gill, gill heart, heart, gonad, stomach, mantle artery, posterior vena cava, cecum, quill.
Describe how gas exchange occurs in an aquatic snail, does it have an open or closed circulatory system?
Gas exchange occurs through its gills circulating O2 through the body. Then O2 blood empties into sinuses and drains back into blood vessels to gills to obtain O2.
Gastropods have an open circulatory system.
What are chromatophores? why are they important to a mollusk?
Chromatophores are little specks throughout the body of a mollusk which changes colour to blend with the environment.
Why is the vascular system important to sea stars? how does it work?
The vascular system of the sea star is important because of its function for movement and digestion. It has the madreporite where water enters it then gets distributed through the ring canal then onto the radial canal then its ampullae and tube feet which contract the muscles and create pressure when moving and eating.
How do echinoderms reproduce asexually?
Echinoderms reproduce by spawning with sperm and eggs meeting in the water.
Compare the breathing of grasshoppers and crayfish.
A grasshopper attains O2 by its spiracles in its exoskeleton which allow diffusion.
A crayfish has gills that allow for gas exchange in water.
Compare the excretory system of a grasshopper to a crayfish.
The Grasshopper has a Malpighian gland whose function is to excrete waste and urine but a crayfish’s green glands are like humans kidneys that eliminate toxic substances and also excretory functions.
Name the five major classes of phylum arthropoda.
Class insecta, class arachnida, class crustacea, class chilopoda and class diplopoda.
