GB1 Lab Chapter 7 - Mollusks Quiz

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Questions and Answers

What are the three parts of a mollusk's body plan?

Foot, mantle, and visceral mass.

What are the four major groups of mollusks?

Chitons, bivalves, gastropods, and cephalopods.

Describe the unifying characteristics of mollusks with examples from each group.

Chitons are marine and have shells; bivalves have two-part shells; gastropods have a flat foot and spiral shell; cephalopods have a cone-like mantle and modified feet.

What is the function of the siphon in squids?

Locomotion, respiration, and discharge of wastes. Signup and view all the answers

What is the function of the adductor muscle in clams?

Aids in opening and closing the valves or shells. Signup and view all the answers

What are the functions of gills in squid and clam?

Aid in gas exchange and respiration. Signup and view all the answers

What is the function of the radula in squids and clams?

Radula in squids help cut prey; in clams it is used for scraping food. Signup and view all the answers

In what ways would having a shell contribute to the evolutionary success of mollusks?

The shell protects the soft body from predators. Signup and view all the answers

What features of squid and octopuses help them adapt to a predatory lifestyle?

Tentacles for capturing prey, sharp beak for consumption, great eyes for color vision. Signup and view all the answers

Why are sensory organs more prominent in cephalopods than in other classes of mollusks?

Because they are larger and more active, requiring these senses to feed, attack prey, and reproduce. Signup and view all the answers

What are three unifying characteristics of arthropods?

Segmented bodies, joined appendages, and exoskeletons. Signup and view all the answers

Compare the similarities and differences between arthropods and annelids.

Similar: external segmentation, ventral nerve cord; Different: annelids have lots of legs and a closed circulatory system while arthropods have segmented appendages and an open circulatory system. Signup and view all the answers

What are the functions of the exoskeleton in arthropods?

Provides an outer covering made out of chitin. Signup and view all the answers

How do arthropods achieve survival success?

Due to their hard covering that protects against harm and predators. Signup and view all the answers

Summarize the distinguishing features of sponges (Porifera).

Multicellular, lack a cell wall, tissues, and organs, have no symmetry. Signup and view all the answers

Summarize the distinguishing features of Cnidaria.

Radially symmetrical, have tentacles, and are diploblastic. Signup and view all the answers

Summarize the distinguishing features of Platyhelminthes.

Flatworms that are triploblastic, acoelomates, bilaterally symmetrical, parasitic, and flattened. Signup and view all the answers

Summarize the distinguishing features of Annelida.

Bilaterally symmetrical, coelomates, segmented organs, and developed circulation and respiratory structures. Signup and view all the answers

Summarize the distinguishing features of Arthropoda.

Exoskeletons, segmented bodies, joined appendages, bilaterally symmetrical, and open circulatory system. Signup and view all the answers

Summarize the distinguishing features of Mollusca.

Soft body protected by a shell, bilaterally symmetrical, have a radula, mantle, and a muscular foot. Signup and view all the answers

Study Notes

Mollusks

Characterized by a three-part body plan: foot, mantle, and visceral mass.
Major groups include chitons, bivalves, gastropods, and cephalopods.
Chitons are marine, have oval bodies and shells, and are generally sessile.
Bivalves have two-part shells and siphons (examples: clams, scallops).
Gastropods can be aquatic or terrestrial, with a flat foot and spiral shells (examples: snails and slugs).
Cephalopods feature a cone-like mantle and modified foot-arms for movement (examples: squid, octopus).
Siphons in squids play roles in locomotion, respiration, and waste discharge.
Adductor muscles in clams operate the opening and closing of shells.
Gills in both squids and clams are essential for gas exchange and respiration.
Squids possess a radula for cutting prey, while clams use it for scraping food.
Shells provide protection from predators, enhancing evolutionary success.
Squid and octopus adaptations include tentacles for capturing prey, sharp beaks for consumption, and advanced color vision.
Prominent sensory organs in cephalopods support their predatory and active lifestyles, enabling feeding, attacking prey, and reproduction.

Arthropods

Distinguishing characteristics include segmented bodies, joined appendages, and exoskeletons composed of chitin.
Bilateral symmetry is a common feature among arthropods.
Similarities with annelids include external segmentation and muscle organization; differences lie in respiration and circulatory systems.
Arthropods have segmented appendages, a chitinous cuticle, and an open circulatory system, while annelids have a closed circulatory system and collagenous cuticle.
The exoskeleton serves as a protective outer covering, preventing injury and predation.
Survival success attributed to their tough exoskeletons, enhancing defense mechanisms.

Cnidaria

Cnidarians exhibit radial symmetry, possess tentacles, and are classified as diploblastic organisms.

Platyhelminthes

Known as flatworms, they are triploblastic, acoelomate, bilaterally symmetrical, often parasitic, and have a flattened body structure.

Annelida

Annelids feature bilateral symmetry, coelomate structure, a developed nervous system, segmented organs, and advanced circulatory and respiratory adaptations.

General Features of Animal Phyla

Sponges (Porifera) are multicellular, lack true tissues and organs, and exhibit no symmetry.
Arthropoda define themselves with an exoskeleton, segmented body structure, jointed appendages, bilateral symmetry, and an open circulatory system.
Mollusca are characterized by soft bodies often protected by shells, bilateral symmetry, radula presence, mantle, and muscular foot.

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Description

Test your knowledge on mollusks with this quiz from GB1 Lab Chapter 7. Explore their unique body structures, major groups, and defining characteristics. Perfect for students looking to strengthen their understanding of animal biology.