18 Questions
Chitons have 5 to 6 shell plates for locomotion and clamping down on rocks.
False
Bivalvia have two shells - one on top and one on bottom of the animal.
False
Most Bivalvia have a radula for grazing on algae.
False
Cephalopoda have a reduced foot that is specialized for digging.
False
Squid have an external, complete shell similar to that of nautilus.
False
Octopus use jet propulsion for movement and swimming.
True
Parthenogenesis is a common reproductive strategy among mollusks.
False
Arthropods and mollusks both exhibit radial symmetry.
False
Ponifera is a phylum that includes jellyfish and squids.
False
A dichotomous key is used to group organisms based on their evolutionary history.
False
The class Gastropoda is characterized by having a hard exoskeleton for protection.
False
Chitons are a type of mollusk known for their ability to paralyze prey with nerve toxins.
False
Arthropods are known to have direct development without any larval stages.
False
Annelids are more effective at flying due to their segmentation characteristics.
False
Centipedes and millipedes belong to the subphylum Crustacea.
False
Chelicerates have jaws for feeding purposes.
False
Anthropods have a reduced coelom called haemocoel.
True
Poly, Hiru, and Oligo are marine invertebrates with no larval stages.
False
Study Notes
Mollusks
- Chitons have 5 to 6 shell plates for locomotion and clamping down on rocks.
- Bivalvia have two shells, one on top and one on the bottom of the animal.
- Most Bivalvia have a radula for grazing on algae.
- Cephalopoda have a reduced foot that is specialized for digging.
- Squid have an external, complete shell similar to that of nautilus.
- Octopus use jet propulsion for movement and swimming.
Reproduction
- Parthenogenesis is a common reproductive strategy among mollusks.
Symmetry
- Mollusks and arthropods both exhibit radial symmetry.
Phyla
- Ponifera is a phylum that includes jellyfish and squids.
Classification
- A dichotomous key is used to group organisms based on their evolutionary history.
Characteristics
- The class Gastropoda is characterized by having a hard exoskeleton for protection.
- Chitons are a type of mollusk known for their ability to paralyze prey with nerve toxins.
Arthropods
- Arthropods are known to have direct development without any larval stages.
- Annelids are not more effective at flying due to their segmentation characteristics.
- Centipedes and millipedes do not belong to the subphylum Crustacea.
- Chelicerates have jaws for feeding purposes.
- Anthropods have a reduced coelom called haemocoel.
- Poly, Hiru, and Oligo are not marine invertebrates with no larval stages.
Test your knowledge on the general characteristics of Phylum Mollusca, including bilateral symmetry, coelomates, developed organ systems, mantle, radula, and muscular foot. Learn about the trochophore larval stage in mollusks.
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