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Questions and Answers
What is the term 'Porifera' in the phylum Porifera derived from?
What is the term 'Porifera' in the phylum Porifera derived from?
- Jelly-like mesohyl
- Multicellular organisms
- Basal animal clade
- Pore bearer (correct)
What is the function of the osculum in sponges?
What is the function of the osculum in sponges?
- To facilitate reproduction
- To allow water to leave the central cavity (correct)
- To aid in respiration
- To deposit nutrients into the central cavity
What do sponges lack, unlike other animals?
What do sponges lack, unlike other animals?
- Heterotrophic nature
- Radial symmetry
- True tissues and organs (correct)
- Complex nervous system
What makes sponges the sister group of all other animals?
What makes sponges the sister group of all other animals?
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What is the role of mesohyl in sponges' bodies?
What is the role of mesohyl in sponges' bodies?
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Study Notes
Porifera and Its Etymology
- The term 'Porifera' is derived from Latin, meaning "pore-bearers," reflecting the numerous pores found in their body structure.
Function of the Osculum
- The osculum is a large opening at the top of a sponge through which water exits after passing through the sponge's body, facilitating water circulation and waste removal.
Characteristics Unique to Sponges
- Unlike other animals, sponges lack true tissues and organs, which distinguishes them in the animal kingdom.
Evolutionary Significance
- Sponges are considered the sister group of all other animals due to their basal position in the evolutionary tree, representing the earliest divergence from the common ancestor of the metazoans.
Role of Mesohyl
- Mesohyl is a gelatinous, supportive matrix within sponges that contains cells and skeletal elements, playing a critical role in maintaining structure and supporting various cellular functions.
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Description
Test your knowledge about the anatomy and characteristics of sponges, the basal animals belonging to the phylum Porifera. Learn about their multicellular bodies, specialized cells, and unique features.
