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Which feature is NOT characteristic of mollusks?
Which feature is NOT characteristic of mollusks?
Which class of Mollusca is characterized by a radula?
Which class of Mollusca is characterized by a radula?
What is the main function of the mantle in mollusks?
What is the main function of the mantle in mollusks?
In which stage do mollusks possess a coelom?
In which stage do mollusks possess a coelom?
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Which of the following mollusks lacks a shell?
Which of the following mollusks lacks a shell?
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What is a defining characteristic of the Bivalvia class?
What is a defining characteristic of the Bivalvia class?
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How do Bivalves primarily obtain their food?
How do Bivalves primarily obtain their food?
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In which part of the Bivalve anatomy does oxygen enter the body?
In which part of the Bivalve anatomy does oxygen enter the body?
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Which statement accurately describes the circulatory system of Bivalves?
Which statement accurately describes the circulatory system of Bivalves?
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What role do nephridia play in the Bivalve excretory system?
What role do nephridia play in the Bivalve excretory system?
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What is the general structure of the Bivalve shell?
What is the general structure of the Bivalve shell?
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What is a feature of the nervous system in Bivalves?
What is a feature of the nervous system in Bivalves?
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Which is NOT a common characteristic of Gastropoda?
Which is NOT a common characteristic of Gastropoda?
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What is the primary role of nephridia in primitive gastropods?
What is the primary role of nephridia in primitive gastropods?
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Which description correctly characterizes the circulatory system of adult gastropods?
Which description correctly characterizes the circulatory system of adult gastropods?
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What type of fertilization do most gastropods predominantly exhibit?
What type of fertilization do most gastropods predominantly exhibit?
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What is the function of statocysts in non-sessile gastropods?
What is the function of statocysts in non-sessile gastropods?
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Which structure plays a crucial role in the locomotion of gastropods?
Which structure plays a crucial role in the locomotion of gastropods?
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How are paired ganglia in gastropods primarily connected within their nervous system?
How are paired ganglia in gastropods primarily connected within their nervous system?
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What role do ciliary water currents have in the excretory system of gastropods?
What role do ciliary water currents have in the excretory system of gastropods?
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Which of the following statements about chemoreceptors in gastropods is true?
Which of the following statements about chemoreceptors in gastropods is true?
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What distinguishes the circulatory system of cephalopods from that of other mollusks?
What distinguishes the circulatory system of cephalopods from that of other mollusks?
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Which component is NOT part of an octopus's digestive system?
Which component is NOT part of an octopus's digestive system?
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How do cephalopods transport oxygen in their blood?
How do cephalopods transport oxygen in their blood?
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Which of the following statements is true regarding the nervous system of cephalopods?
Which of the following statements is true regarding the nervous system of cephalopods?
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What is the primary function of the branchial hearts in cephalopods?
What is the primary function of the branchial hearts in cephalopods?
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Which organ system in cephalopods helps to filter and excrete waste products?
Which organ system in cephalopods helps to filter and excrete waste products?
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What structure stores the excreted liquid in cephalopods before it is released?
What structure stores the excreted liquid in cephalopods before it is released?
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What is the primary function of the chromatophores in cephalopods?
What is the primary function of the chromatophores in cephalopods?
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Which of the following statements about the breathing system of cephalopods is correct?
Which of the following statements about the breathing system of cephalopods is correct?
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In cephalopods, what is the purpose of the ink sac?
In cephalopods, what is the purpose of the ink sac?
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Which cephalopods feature both external and internal fertilization?
Which cephalopods feature both external and internal fertilization?
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What type of eyes do octopuses have that contribute to their perception of depth?
What type of eyes do octopuses have that contribute to their perception of depth?
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How quickly can the broadclub cuttlefish change its coloration?
How quickly can the broadclub cuttlefish change its coloration?
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What unique feature do cuttlefish possess that aids in color distinction?
What unique feature do cuttlefish possess that aids in color distinction?
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What compound primarily makes up the cloud expelled by cephalopods from their ink sac?
What compound primarily makes up the cloud expelled by cephalopods from their ink sac?
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What is the term used for the copulatory arm of male octopuses used during reproduction?
What is the term used for the copulatory arm of male octopuses used during reproduction?
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What is a unique characteristic of female octopuses after they lay eggs?
What is a unique characteristic of female octopuses after they lay eggs?
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Which method of locomotion is primarily used by cephalopods?
Which method of locomotion is primarily used by cephalopods?
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What is true about the reproductive strategy of female cephalopods?
What is true about the reproductive strategy of female cephalopods?
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Which aspect distinguishes sexual dimorphism in cephalopods?
Which aspect distinguishes sexual dimorphism in cephalopods?
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Why is jet propulsion considered less efficient for cephalopods compared to other methods?
Why is jet propulsion considered less efficient for cephalopods compared to other methods?
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What is an exception to the behavior of female cephalopods eating males after copulation?
What is an exception to the behavior of female cephalopods eating males after copulation?
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What is the purpose of the protective coat of each egg laid by female cephalopods?
What is the purpose of the protective coat of each egg laid by female cephalopods?
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In which environments do cephalopods primarily inhabit?
In which environments do cephalopods primarily inhabit?
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Study Notes
Mollusca Characteristics
- Triploblastic: having three germ layers during embryonic development
- Lack body segmentation: their bodies aren't divided into repeating units
- Soft bodies: many have shells; sometimes the shell is reduced or lost (e.g., cuttlefish)
- Mantle: a special tissue that secretes the shell
- Body Parts: head, foot, and visceral hump
- Coelom: a secondary body cavity, present only in the embryonic stage, later fuses with the primary body cavity called enteron
Mollusca Classification
- Gastropoda: snails, slugs, and limpets
- Bivalvia: clams, mussels, oysters
- Cephalopoda: octopuses, squids, cuttlefish
Gastropoda Characteristics
- Distinct head with eyes and tentacles
- Single, coiled, asymmetrical shell (sometimes absent)
- Radula: a tongue-like organ with rows of teeth used for feeding
Anatomy (example for snail)
- The body contains internal organs like the stomach, kidney, liver, heart, and nerves.
- The foot is a muscular organ used for movement, and there are mucous glands to secrete mucus to assist in movement.
Bivalvia Characteristics
- Reduced head, no tentacles, and no radula
- Two-part shell (valves) joined by a ligament
- Primarily filter feeders
Cephalopoda Characteristics
- Conspicuous head with well-developed eyes and tentacles
- Beak and radula used for feeding
- Fast-moving, active, and often considered the most intelligent invertebrates
- Mostly without a shell (e.g., octopus, cuttlefish), some have a reduced or internal shell (e.g., Nautilus).
Cephalopoda Anatomy (example for cuttlefish)
- Eyes: complex structures with lenses and pupils
- Siphon: used for expelling water for jet propulsion
- Ink sac: to confuse or deter predators
Mollusca Systems
- Digestive: responsible for breaking down and absorbing food.
- Breathing: terrestrial molluscs may use lungs, aquatic use gills
- Circulatory: often open circulatory system, fluid (hemolymph) bathes body tissues
- Excretory: waste disposal through nephridia (kidneys)
- Nervous: ganglia (clusters of nerve cells), often simple nervous system
- Sensory: eyes, tentacles, chemoreceptors (detecting chemicals)
- Reproductive: may be hermaphroditic (both sexes in one individual) or have separate sexes; external or internal fertilization; different types of developmental stages
- Locomotion: different types of movement depending on the species; in snails, the foot moves by waves; cephalopods can use jet propulsion.
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Description
Explore the unique characteristics and classification of mollusks, including their anatomical features and the different classes such as Gastropoda, Bivalvia, and Cephalopoda. This quiz will test your understanding of the diverse forms and functions of these soft-bodied invertebrates.
