40 Questions
What is the function of the starfish's everted stomach in obtaining food?
To release enzymes that turn the clam into a broth
What is the function of the podia in the starfish's water vascular system?
To provide additional surfaces for gaseous exchange
What is the structure of the reproductive system in starfish?
Two genital sacs per arm that contains the gonads
What is the sequence of development in starfish?
Eggs → bipinnaria → branchiolaria → adult
What is the characteristic of the tube feet in the order Paxillosida?
They do not have suckers
What is the characteristic of the order Forcipulatida?
They have pedicellariae composed of a short stalk and three skeletal ossicles
What is the characteristic of the order Spinulosida?
They have low spines on the aboral surface and suckered tube feet
What is the subclass of the class Stelleroidea that includes starfish?
Ophiuroidea
Which order does the species Siliquaria sp. belong to?
Order Sorbeoconcha
What common name is associated with Epitonium scalare?
Precious wentletrap
Which species is known as the sea hare?
Aplysia
To which subclass does Perna sp. belong?
Subclass Pteriomorpha
Which species is commonly known as the tulip shell?
Fasciolaria trapezium
What order includes the family Architectonicidae?
Order Anaspidea (Aplysiacea)
Which species is associated with the nickname 'pen oyster'?
Pinna sp.
What species is referred to as the spindle shell?
Fusinus colus
What is the function of the axial gland in the coelom?
Endocrine function
What connects to the underlying coelomic spaces in the water vascular system?
Ciliated funnels
What characterizes the digestive system mentioned?
Exocyclic system
What is the structure surrounding the esophagus in the circulatory system?
Periesophageal lacunae
What type of larva is produced by external fertilization in the reproductive system?
Vitellaria larva
Which subclass includes both extinct and living crinoids?
Articulata
Which order includes feather stars with a ballet-like swimming motion?
Comatulida
What defines the dorsal surface of Class Holothuroidea?
Bivium
What is unique about reproduction in most species discussed?
They are dioecious with paired gonads, gonoducts, nephridia, exhalant siphon
In the lifecycle described, what does the trochophore larva develop into?
A veliger
What adaptation allows some species to live attached to objects?
Byssal threads
How do scallops move about?
By flapping their valves and creating a jet of water
What is the shell structure of extant cephalopods like squids and cuttlefish?
Reduced into an internal cartilaginous pen
What parasitic form can some veligers develop into?
Glochidium or haustorium
What is a key characteristic of the head structure in cephalopods?
It forms a crown or circle of tentacles or arms
What happens to the viscera as the dorso-ventral axis elongates in cephalopods?
They become posterior
What is the primary function of the osphradia?
Detecting sediments and acting as chemoreceptors
Which statement correctly describes the excretory route in mollusks?
Blood → nephrostome → kidney → tubule → nephridiophore
What sensory organs are found in mollusks?
Eyes, statocyst, and osphradia
Which reproductive process involves the development of a mollusk from zygote to adult?
Zygote → spiral cleavage → gastrula → trochophore → veliger
Which part of the mollusk's nervous system controls the muscles of the foot?
Ventral/pedal cords
Which characteristic is NOT true for the Class Aplacophora?
They have a well-developed head
What is the function of the statocyst in mollusks?
Maintaining balance
Which of the following correctly describes the role of metanephridia?
Excreting waste and reabsorbing essential substances
This quiz covers the structure and function of the excretory and nervous systems in mollusks, including the metanephridia, nephrostome, and nerve ring.
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