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Questions and Answers
Which phylum exhibits organ level of organisation?
Which phylum exhibits organ level of organisation?
- Annelids
- Coelenterates
- Sponges
- Platyhelminthes (correct)
In which phylum are cells arranged into tissues, exhibiting tissue level of organisation?
In which phylum are cells arranged into tissues, exhibiting tissue level of organisation?
- Sponges
- Annelids
- Coelenterates (correct)
- Molluscs
Which organisms exhibit cellular level of organisation?
Which organisms exhibit cellular level of organisation?
- Molluscs
- Sponges (correct)
- Annelids
- Platyhelminthes
Among these, in which organisms do some division of labour occur among the cells?
Among these, in which organisms do some division of labour occur among the cells?
What type of digestive system does Platyhelminthes have?
What type of digestive system does Platyhelminthes have?
Which type of symmetry is exhibited by annelids and arthropods?
Which type of symmetry is exhibited by annelids and arthropods?
What characterizes the open type of circulatory system?
What characterizes the open type of circulatory system?
What is the defining feature of closed type circulatory system?
What is the defining feature of closed type circulatory system?
In which organisms does any plane passing through the central axis of the body divide the organism into two identical halves?
In which organisms does any plane passing through the central axis of the body divide the organism into two identical halves?
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Study Notes
Levels of Organization in Phyla
- Organ level of organization is exhibited by phylum Platyhelminthes (flatworms).
- Phylum Cnidaria (jellyfish, corals) features tissue level of organization, where cells are arranged into tissues.
- Phylum Porifera (sponges) demonstrates cellular level of organization, consisting of loosely aggregated cells.
Division of Labor
- In Phylum Porifera, some division of labor occurs among cells, where specific cells perform specialized functions.
Digestive Systems
- Phylum Platyhelminthes possesses a gastrovascular cavity, leading to a single opening digestive system.
Types of Symmetry
- Both annelids (segmented worms) and arthropods (insects, arachnids) exhibit bilateral symmetry, allowing for a division into mirrored halves.
Circulatory Systems
- An open circulatory system is characterized by the absence of blood vessels; blood flows freely through cavities (hemocoel).
- A closed circulatory system features blood confined within vessels, promoting efficient transport of nutrients and gases.
Symmetry in Organisms
- Organisms with radial symmetry, found in phyla like Cnidaria, can be divided into two identical halves by any plane passing through the central axis.
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