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11 Cards in this Set

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a cnidarian body form that is umbrella-shaped with tentacles that hang down.
medusa
a cnidarian body form that is tube-shaped with a mouth surrounded by tentacles.
polyp
in cnidarians, a capsule that contains a coiled, threadlike tube that may be sticky, barbed, or contain poisons; used in capturing prey
nematocyst
in cnidarians, a large cavity in which digestion takes place.
gastrovascular cavity
simple netlike nervous system in cnidarians that conducts nerve impulses from all parts of the cnidarian's body.
nerve net
Evaluate the adaptations of cnidarians for obtaining food.
Because cnidarians are sessile or move on currents, they cannot chase prey. Nematocysts are an adaptation that allow cnidarians to efficiently capture prey from passing water. Tentacles move prey to the cnidarian’s mouth. Corals also have photosynthetic zooxanthellae in their bodies that provide food for the coral
Interpret the advantage of the reproductive cycle of a jellyfish.
A. Male and Female jellyfish release sperm and eggs into water respectively
B. Fertilization occurs
C. Larva forms
D. Turns into polyp and settles into the ground
E. Makes buds (asexual reproduction)
F. Buds form medusa form jellyfish
What are the advantages of a two-layered body in cnidarians?
The cell layers of cnidarians are organized into tissues, which enable an animal to be more efficient in carrying out life functions (getting nutrients to every cell and excreting wastes)
Distinguish between corals and other cnidarians.
Corals can live for thousands of years because they take very long to grow and reproduce. The are surrounded by calcium carbonate (rock) which protect them for thousands of years.
Investigate and explain how destruction of a large coral reef would affect other ocean life.
Other ocean life will be destroyed because the marine life of the area is dependent upon coral reefs for food and habitats or niches
List the three main groups of cnidarians, their characteristics, and a member of each group
Anthozoans- sea anemones and corals - have many incomplete divisions - mostly polyps
Scyphozoans- jellyfish - 4 internal divisions - first polyps, then medusa Hydrozoans- Porteguese man of war and hydra - 0 divisions - can be polyps or medusa