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Questions and Answers
What phylum does Class Hydrozoa belong to?
What phylum does Class Hydrozoa belong to?
- Phylum Arthropoda
- Phylum Echinodermata
- Phylum Cnidaria (correct)
- Phylum Mollusca
What organisms are included in Hydrozoa?
What organisms are included in Hydrozoa?
Hydra and Obelia
Hydrozoas are mostly freshwater organisms.
Hydrozoas are mostly freshwater organisms.
False (B)
Hydrozoas mostly have a _____ and _____ life cycle.
Hydrozoas mostly have a _____ and _____ life cycle.
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What does the attached colony of Obelia include?
What does the attached colony of Obelia include?
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What do reproductive polyps in Obelia produce?
What do reproductive polyps in Obelia produce?
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What do medusas produce in the Obelia life cycle?
What do medusas produce in the Obelia life cycle?
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What happens after fertilization in the life cycle of Obelia?
What happens after fertilization in the life cycle of Obelia?
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Study Notes
Class Hydrozoa Overview
- Belongs to the Phylum Cnidaria, which includes diverse marine and freshwater organisms.
- Characterized by a life cycle that often features both polyp and medusa stages, with some exhibiting only the polyp form.
Notable Members
- Contains genera like Hydra (found in freshwater) and Obelia (primarily marine).
- Hydrozoans can either be solitary or colonial, depending on the species.
Marine and Freshwater Habitats
- Most Hydrozoans are marine, crafting intricate relationships with their aquatic ecosystems.
- Hydra stands out as an exception since it inhabits freshwater environments.
Life Cycle of Obelia
- Start with an attached colony comprising specialized feeding polyps and reproductive polyps.
- The reproductive polyps are responsible for producing medusas, which are the free-swimming phase of the life cycle.
- Medusas generate either sperm or eggs, facilitating sexual reproduction.
- Fertilization leads to the formation of a larva that swims, anchors itself, and grows into a new colony.
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