Moodle - BIO 106 Lab - Chapter 8 and 9

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TRUE

Cnidarians have two germ layers, and are at the tissue level of development. TRUE/FALSE

ostia; osculum

Water flow is an important aspect of any sponge's life. The water flows in through the ____________, and out through the ____________.

FALSE

A nematode is a segmented worm. TRUE/FALSE

FALSE

All members of phylum Nematoda are parasitic and require a host to survive. TRUE/FALSE

FALSE

Earthworms (Lumbricus terrestris) are hermaphroditic. They never mate with another individual. TRUE/FALSE

FALSE

Earthworms have two hearts. TRUE/FALSE

Molting

In nematodes, ecdysis means or is interpreted as

Hirudin

Leeches use an anticoagulate called _________________ to prevent its host's blood from clotting.

Tissue

Sponges (Porifera) are said to have which level of organization?

Cnidocytes

The organism above contains stinging cells that allows it to catch prey and that also give the phylum its name. What are these cells called?

Memorize this

Underside of the worm

Radial

What Symmetry is this?

An oligochaete lacks parapodia

What is the difference between a polychaete and an oligochaete?

Cnidocyte

What is this unique stinging cell called that is possessed by Cnidarians?

Acoelom

What is this?

Coelom

What is this?

Pseudocoelom

What is this?

that the neurophysiology those drugs affect has been conserved since the common ancestor of protostomes and deuterostomes

What would it mean if C. elegans has a similar neurophysiological response to nicotine and alcohol as humans do?

Trematoda

Which of these taxa is characteristically (almost entirely) parasitic?

Mantle, head, visceral mass, muscular foot

Choose the main parts uniting the various groups of mollusks (like synapomorphies for the phylum, like to'ally).

TURE

Mesoderm occurs in flatworms but not in cnidarians or sponges. The mesoderm eventually becomes part of the functional unit of rudimentary organs. TRUE/FALSE

FALSE

The body plan of cnidarians is composed of two cell layers, the epidermis (from ectoderm) and the gastrodermis (from endoderm). Therefore, these simple animals are triploblastic and have well developed organ systems. TRUE/FALSE

Polychaeta

This organism is a segmented worm; to which class does it belong?

What does cephalization mean?

the development of sense organs and nervous system control at the body's leading head.


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