Biology: Excretory and Nervous Systems

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What is the function of the starfish's everted stomach in obtaining food?

To swallow prey whole

To filter small particles from the water

To remove detritus from the surface

To release enzymes that turn the clam into a broth (correct)

What is the function of the podia in the starfish's water vascular system?

To facilitate the movement of the starfish

To provide additional surfaces for gaseous exchange (correct)

To release enzymes that break down food

To sense the environment

What is the structure of the reproductive system in starfish?

A single genital sac per arm that contains the gonads

Gonads located at the base of the starfish

Two genital sacs per arm that contains the gonads (correct)

Gonads distributed throughout the starfish's body

What is the sequence of development in starfish?

Eggs → bipinnaria → branchiolaria → adult Signup and view all the answers

What is the characteristic of the tube feet in the order Paxillosida?

They do not have suckers Signup and view all the answers

What is the characteristic of the order Forcipulatida?

They have pedicellariae composed of a short stalk and three skeletal ossicles Signup and view all the answers

What is the characteristic of the order Spinulosida?

They have low spines on the aboral surface and suckered tube feet Signup and view all the answers

What is the subclass of the class Stelleroidea that includes starfish?

Ophiuroidea Signup and view all the answers

Which order does the species Siliquaria sp. belong to?

Order Sorbeoconcha Signup and view all the answers

What common name is associated with Epitonium scalare?

Precious wentletrap Signup and view all the answers

Which species is known as the sea hare?

Aplysia Signup and view all the answers

To which subclass does Perna sp. belong?

Subclass Pteriomorpha Signup and view all the answers

Which species is commonly known as the tulip shell?

Fasciolaria trapezium Signup and view all the answers

What order includes the family Architectonicidae?

Order Anaspidea (Aplysiacea) Signup and view all the answers

Which species is associated with the nickname 'pen oyster'?

Pinna sp. Signup and view all the answers

What species is referred to as the spindle shell?

Fusinus colus Signup and view all the answers

What is the function of the axial gland in the coelom?

Endocrine function Signup and view all the answers

What connects to the underlying coelomic spaces in the water vascular system?

Ciliated funnels Signup and view all the answers

What characterizes the digestive system mentioned?

Exocyclic system Signup and view all the answers

What is the structure surrounding the esophagus in the circulatory system?

Periesophageal lacunae Signup and view all the answers

What type of larva is produced by external fertilization in the reproductive system?

Vitellaria larva Signup and view all the answers

Which subclass includes both extinct and living crinoids?

Articulata Signup and view all the answers

Which order includes feather stars with a ballet-like swimming motion?

Comatulida Signup and view all the answers

What defines the dorsal surface of Class Holothuroidea?

Bivium Signup and view all the answers

What is unique about reproduction in most species discussed?

They are dioecious with paired gonads, gonoducts, nephridia, exhalant siphon Signup and view all the answers

In the lifecycle described, what does the trochophore larva develop into?

A veliger Signup and view all the answers

What adaptation allows some species to live attached to objects?

Byssal threads Signup and view all the answers

How do scallops move about?

By flapping their valves and creating a jet of water Signup and view all the answers

What is the shell structure of extant cephalopods like squids and cuttlefish?

Reduced into an internal cartilaginous pen Signup and view all the answers

What parasitic form can some veligers develop into?

Glochidium or haustorium Signup and view all the answers

What is a key characteristic of the head structure in cephalopods?

It forms a crown or circle of tentacles or arms Signup and view all the answers

What happens to the viscera as the dorso-ventral axis elongates in cephalopods?

They become posterior Signup and view all the answers

What is the primary function of the osphradia?

Detecting sediments and acting as chemoreceptors Signup and view all the answers

Which statement correctly describes the excretory route in mollusks?

Blood → nephrostome → kidney → tubule → nephridiophore Signup and view all the answers

What sensory organs are found in mollusks?

Eyes, statocyst, and osphradia Signup and view all the answers

Which reproductive process involves the development of a mollusk from zygote to adult?

Zygote → spiral cleavage → gastrula → trochophore → veliger Signup and view all the answers

Which part of the mollusk's nervous system controls the muscles of the foot?

Ventral/pedal cords Signup and view all the answers

Which characteristic is NOT true for the Class Aplacophora?

They have a well-developed head Signup and view all the answers

What is the function of the statocyst in mollusks?

Maintaining balance Signup and view all the answers

Which of the following correctly describes the role of metanephridia?

Excreting waste and reabsorbing essential substances Signup and view all the answers