BIOLOGY 11
PHYLUM CNIDARIA
The things the specimens and photos of Cnidarians have in common are...
The main characteristics of cnidarians are:
Body Structure:
Important changes in structure from a sponge are...
Ms. Smith
NAME: _________________________________
BLOCK: _________
DATE: ___________________________
Feeding:
How a Cnidocyte works:
1. “trigger” is touched, allowing water to
enter the cnidocyte cell
2. a water-based chemical reaction occurs
and the barbed nematocyst shoots outward
3. a fine thread connects the nematocyst to
the cnidocyte, helping the cnidarians hold
onto its prey
Describe the relationship between
zooxanthellae or algae and some cnidarians:
A cnidarian’s excretion and internal transport systems function mainly by diffusion. What is diffusion?
Response Systems:
ocelli :
statocysts:
nerve net:
This is a life cycle of a moon jelly. What is this process called? _______________________________________
Box each polyp-related step, and circle each medusa-related
step in the life cycle on the left.
How is this life cycle different between cnidarians?
NAME: _________________________________
BLOCK: _________
What are some examples of animals in the 3 different classes of cnidaria?
Anthozoa:
o characteristics:
Scyphozoa:
o characteristics:
Hydrazoa:
o characteristics:
Name one reason cnidarians are important for to the environment:
DATE: ___________________________
NAME: _________________________________
BLOCK: _________
DATE: ___________________________
SUMMARY PAGE:
The main characteristics of cnidarians are:
Cnidarians are more complicated than members of phylum Porifera because...
Important definitions:
ocelli :
statocysts:
nerve net:
cnidocyte:
nematocyst:
mesoglea:
alternation of generations:
Describe the basic life cycle of a cnidarian. What are the main two body forms in its life cycle called?