Phylum Mollusca: The Molluscs
Today we’ll be looking at a well-known, large phylum of invertebrate animals, called Mollusca – whose members are most often referred to as molluscs, of which around 85,000 extant species are recognised. What do you know about them?
Questions and Answers
- 1.
What carried out many functions, but protection of the soft body is the primary function?
Explanation
The mantle is a layer of tissue found in mollusks that carries out various functions, including protection of the soft body. It acts as a cover for the internal organs and produces the shell in many mollusks. The mantle also plays a role in locomotion, respiration, and the secretion of mucus. Therefore, while the mantle carries out multiple functions, its primary function is the protection of the soft body.Rate this question:
- 2.
The molluscan body is divided into two regions -- the _________ and _________.
Explanation
The correct answer is "Head-foot, visceral mass". In mollusks, the body is divided into two main regions: the head-foot, which contains sensory organs and is responsible for locomotion, and the visceral mass, which contains the internal organs such as the digestive, reproductive, and circulatory systems. Therefore, the head-foot and visceral mass are the correct regions in which the molluscan body is divided.Rate this question:
- 3.
Which region contains the feeding, special sensory, and locomotion structures?
Explanation
The head-foot region contains the feeding, special sensory, and locomotion structures. This region is responsible for various functions such as eating, sensing the environment, and movement. It is typically found in organisms such as mollusks, where the head contains sensory organs and the foot is used for locomotion.Rate this question:
- 4.
All but the_________ have a rasping, tongue-shaped organ called the radula, which is used for feeding.
Explanation
Bivalves are the only organisms mentioned in the question that do not have a rasping, tongue-shaped organ called the radula. The radula is used for feeding in most mollusks, including gastropods (snails and slugs), cephalopods (squids and octopuses), and chitons. Bivalves, on the other hand, have a different feeding mechanism where they filter feed by pumping water through their gills and trapping food particles. Therefore, bivalves are the correct answer in this case.Rate this question:
- 5.
Most molluscs go through metamorphosis, producing larval forms such as a ____________ and __________.
Explanation
The correct answer is "trochophore, veliger". Most molluscs go through metamorphosis and produce larval forms called trochophores and veligers. These larval forms are distinct stages in the development of molluscs, with trochophores being the earlier stage and veligers being the later stage.Rate this question:
- 6.
Molluscs are the _________ largest phylum of animals with approximately 50,000 extant species.
- A.
1st
- B.
2nd
- C.
3rd
Correct Answer
B. 2ndExplanation
Molluscs are the second largest phylum of animals with approximately 50,000 extant species. This means that there is another phylum that has more species than molluscs.Rate this question:
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- 7.
The genus Chiton is located in what class?
Correct Answer
PolyplacophoraExplanation
The genus Chiton is located in the class Polyplacophora. This is because Polyplacophora is the class that includes chitons, which are a type of marine mollusk. Chitons are characterized by their shell, which is composed of multiple plates or valves, and their ability to cling to rocks or other surfaces using a muscular foot. Therefore, it can be concluded that the correct answer is Polyplacophora.Rate this question:
- 8.
The genus Dentalium is located in what class?
Correct Answer
Scaphopoda - 9.
The genus Busycon is found in what class?
Correct Answer
Gastropoda - 10.
The genus Helix found in what class?
Correct Answer
Gastropoda - 11.
The genus Limax is found in what class?
Correct Answer
Gastropoda - 12.
The genus Haliotis is found in what class?
Correct Answer
Gastropoda - 13.
The genus Ostrea is found in what class?
Correct Answer
Bivalvia - 14.
The genus Ptychobranchus is found in what class?
Correct Answer
Bivalvia - 15.
The genus Nautilus is found in what class?
Correct Answer
Cephalopoda - 16.
The genus Sepia is found in what class?
Correct Answer
Cephalopoda - 17.
The genus Octopus is found in what class?
Correct Answer
Cephalopoda - 18.
The genus Loligo is found in what class?
Correct Answer
Cephalopoda - 19.
What is the genus of this species?
Correct Answer
ChitonExplanation
The genus of this species is Chiton.Rate this question:
- 20.
What is the genus of this species?
Correct Answer
Dentallium - 21.
What is the genus of this species?
Correct Answer
Busycon - 22.
What is the genus of this species?
Correct Answer
HelixExplanation
Helix is the genus of this species. The question is asking for the genus of a particular species, and the answer provided is "Helix." In biological classification, the genus is a rank in the taxonomic hierarchy that groups together closely related species. Therefore, the correct answer indicates that the species in question belongs to the genus Helix.Rate this question:
- 23.
What is the genus of this species?
Correct Answer
LimaxExplanation
The genus of this species is also Limax.Rate this question:
- 24.
What is the genus of this species?
Correct Answer
HaliotisExplanation
The genus of this species is Haliotis.Rate this question:
- 25.
What is the genus of this species?
Correct Answer
OstreaExplanation
The genus of this species is Ostrea.Rate this question:
- 26.
What is the genus of this species?
Correct Answer
PtychobranchusExplanation
The genus of this species is Ptychobranchus.Rate this question:
- 27.
What is the genus of this species?
Correct Answer
NautilusExplanation
The genus of this species is Nautilus. In biological classification, the genus is a rank in the taxonomic hierarchy that groups closely related species. Nautilus is a genus of cephalopods that includes several species of marine mollusks.Rate this question:
- 28.
What is the genus of this species?
Correct Answer
SepiaExplanation
The genus of this species is Sepia.Rate this question:
- 29.
What is the genus of this species?
Correct Answer
OctopusExplanation
The genus of this species is Octopus because Octopus is a specific genus of cephalopods, which includes various species of octopuses.Rate this question:
- 30.
What is the genus of this species?
Correct Answer
LoligoExplanation
Loligo is the genus of this species.Rate this question:
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Mar 22, 2023Quiz Edited by
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Mar 05, 2011Quiz Created by
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