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Phylum Mollusca Lab 5: Questions and Answers, Exams of Nursing

Chamberlain College of NursingNursing

A comprehensive set of questions and answers related to the phylum mollusca, covering various aspects of their anatomy, classification, and physiology. It includes detailed explanations of key features, such as the radula, mantle cavity, and jet propulsion, as well as specific examples of different mollusc classes, including chitons, snails, bivalves, and cephalopods. A valuable resource for students studying invertebrate zoology or related fields.

Typology: Exams

2024/2025

Available from 03/18/2025

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ABP 2290 - Phylum Mollusca Lab 5
Questions with complete solution
Dentalium - correct answers tusk or tooth shells
Lolingo - correct answers squid
Mytilus - correct answers mussels
Nautilus - correct answers - the spiral shell
- is the only extant cephalopod with a well-developed, external shell
anterior/posterior vena cava - correct answers After passing through the
tissues, blood returns through a complex vein system to the anterior/posterior
vena cava.
the anterior/posterior vena cava feed the branchial hearts, which pump blood
into the gills for oxygenation
anterior/posterior aorta - correct answers aerated blood from both gills feeds
into the systemic heart, which then pumps blood out to the body via the
anterior/posterior aorta and genital artery
radula - correct answers a rasplike feeding structure in the buccal cavity
What is mollusc classification based on? - correct answers based on foot
morphology and type of shell
What Class are chitons members of? - correct answers Class Polyplacophora
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ABP 2290 - Phylum Mollusca Lab 5

Questions with complete solution

Dentalium - correct answers tusk or tooth shells Lolingo - correct answers squid Mytilus - correct answers mussels Nautilus - correct answers - the spiral shell

  • is the only extant cephalopod with a well-developed, external shell anterior/posterior vena cava - correct answers After passing through the tissues, blood returns through a complex vein system to the anterior/posterior vena cava. the anterior/posterior vena cava feed the branchial hearts, which pump blood into the gills for oxygenation anterior/posterior aorta - correct answers aerated blood from both gills feeds into the systemic heart, which then pumps blood out to the body via the anterior/posterior aorta and genital artery radula - correct answers a rasplike feeding structure in the buccal cavity What is mollusc classification based on? - correct answers based on foot morphology and type of shell What Class are chitons members of? - correct answers Class Polyplacophora

valves - correct answers the eight calcareous dorsal plates on chitons girdle (mantle) - correct answers the fleshy ring visible around the chiton that underlies the plates foot - correct answers the fleshy underside of the chiton (5) gills (chiton) - correct answers the ribbed ring around the chitons foot (4) pallial groove - correct answers the space that runs along both sides of the animal, between the foot and the girdle What is the degree of cephalization in Katharina (chitons)? - correct answers a low degree of cephalization because they have a reduced nervous and sensory organ system What Class are snails or snail-like molluscs members of? - correct answers Class Gastropoda What are the three important features of gastropods? - correct answers - a well-developed head

  • a muscular foot adapted to crawling or swimming
  • a single, coiled shell (which may be internal, or absent in some) torsion - correct answers a 180 degree twisting of the body which results in the mantle cavity, gills, and anus being located at the anterior of the animal

jet propulsion - correct answers water is taken into the mantle cavity as a form to swim jaws - correct answers a beaklike structure; present in the squids structure mantle cavity - correct answers the inner part of the tusk/tooth shell small aperture - correct answers the end of the tusk/tooth shell that is projected above the surface captacula - correct answers the fine tentacles of the tusk/tooth shell used to capture and transport microscopic interstitial organisms to the mouth funnel - correct answers a cone-shaped structure extending ventrally past the mantle opening Do squid (Loligo sp.) have arms, tentacles, or both? - correct answers they have short arms as well as 2 longer tentacles all with suckers mantle - correct answers the muscular tube into which the head of the squid is inserted mantle locking ridges - correct answers the two projections from the mantle; they articulate with the two cartilaginous locking grooves on the head To achieve the most effective jet propulsion, would water exit the mantle cavity through the funnel, lateral valves, or both? - correct answers the lateral valves take the water into the mantle cavity and the funnel removes the water from the cavity for jet propulsion

ink sac - correct answers - below and attached tightly to the rectum

  • long thin and silvery
  • filled with the pigment melanin gills (squid) - correct answers they lie within the mantle (look like feathers in the demonstration dissection) How many hearts does squid (Loligo) have? - correct answers three - two branchial hearts and one systemic heart efferent branchial vessel - correct answers runs along the inner edge of each gill, returning oxygenated blood to the systemic heart at the lateral corners anterior vena cava - correct answers found in the region of the kidney - it branches, and passes through the kidney to empty into the branchial hearts anterior aorta - correct answers comes off the forward-most corner of the systemic heart posterior aorta - correct answers comes off the posterior corner of the systemic heart What are the genital artery branches? - correct answers the median mantle artery, and the two lateral mantle arteries, which run along the inner edges of the posterior vena cavae branchial hearts - correct answers one at the base of each gill, collect blood from the two posterior vena cavae and one anterior vena cava

Oviduct - correct answers Lies parallel to the rectum; immature squids have two Testis - correct answers Large, somewhat firm, light coloured and beneath the cecum Penis - correct answers Large, coiled tubules of the spermatophoric glands, extends anteriorly What is special about one of the male squids arms? - correct answers One of the arms will have several rows of suckers as an adhesion area to transport sperm during copulation Pen - correct answers Embedded in the dorsal side of the mantle cavity; evidence of calcium carbonate cause it is a support structure- very thin Lens - correct answers Opaque round structure surrounded by the iris; ciliary muscles move the lens back and forth to focus images Retina - correct answers Lining the interior of the back of the eyeball; contains photoreceptors which convert light energy to nervous impulses, and transmit the impulses to optic ganglia Cuttlebone - correct answers - cuttlefish body structure

  • full of air pockets therefore a more effective swimming body structure for buoyancy than other support structures planospiral - correct answers coiling of shells (Nautilus sp.)

septa - correct answers the thin walls between the inner chambers of a cephalopod sipuncle - correct answers the slender tube of tissue that perforates the septa and connects the tissue camerae - correct answers the chambers that divide the shell ammoniods and nautiloids - correct answers extinct members of Class Cephalopoda visceral mass - correct answers the soft non muscular region that contains the internal organs of a mollusc filter feeding - correct answers strain the suspended food particles from the water