18 Questions
What is the main characteristic of the Coelenteron in the Class Hydrozoa?
It serves as both a digestive chamber and a hydrostatic skeleton
What is the primary function of the cnidocytes (stinging cells) found in the tentacles of Hydrozoa?
For capturing prey and defense
Which of the following is a characteristic of the medusa form in the Class Hydrozoa?
It is the dominant life stage
How do Hydrozoa typically reproduce sexually?
Through separate sexes with external fertilization
What type of environment do Hydrozoa commonly inhabit?
Shallow saltwater habitats, including coastal areas, estuaries, and coral reefs
What is the primary food source for Hydrozoa?
Minute crustaceans, insect larvae, zooplankton, and other small organisms
What is the distinguishing feature of the medusa form of some jellyfish discussed in the text?
Flattened bell lacking typical swimming capability
What is the role of zooxanthellae in the symbiotic relationship with certain jellyfish?
Provide energy through photosynthesis
In the class Anthozoa, what is the function of cnidocytes on the hollow tentacles surrounding the central mouth?
Prey capture and defense
What aids in directing food particles into the gastrovascular cavity for digestion in Anthozoa?
Stomodeum leading from the mouth
How do polyps typically reproduce in Anthozoa?
Release gametes externally for fertilization
What is a characteristic of planula larvae in the life cycle of Anthozoa?
Settling onto a substrate after formation
What is a distinguishing feature of Physalia, a member of Class Hydrozoa?
Gas-filled float and cluster of polyps
Which structure in Physalia helps it achieve buoyancy in the water?
Pneumatophore
What is the role of Dactylozoids in Class Hydrozoa?
Long tentacles with venomous cnidocytes
How do Physalia colonies reproduce?
Through the production of gametes by Gonozoids
What is the primary function of Gonozoids in Class Hydrozoa?
Producing gametes
Which feature distinguishes Class Scyphozoa from Class Hydrozoa based on the text?
Free-swimming medusa dominant life cycle
Learn about the characteristics of Class Hydrozoa including Hydroids with simple mouth openings, undivided coelenteron, acellular mesoglea, and inconspicuous medusae. Understand the differences between forms of colonies and solitary individuals.
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