Characteristics of phylum mollusca
What is the main characteristic that all Mollusca have in common?
Despite their amazing diversity, all molluscs share some unique characteristics that define their body plan. The body has a head, a foot and a visceral mass. This is all covered with a mantle (also known as a pallium) that typically secretes the shell.
What 3 characteristics do all molluscs have?
The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula (except for bivalves), and the structure of the nervous system.
What are the 5 main classes of Mollusca?
Mollusks can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda. These classes are distinguished by, among other criteria, the presence and types of shells they possess.
What makes Mollusca unique?
All molluscs also have gills, a mouth and an anus. A feature unique to molluscs is a file-like rasping tool called a radula. This structure allows them to scrape algae and other food off rocks and even to drill through the shell of prey or catch fish.
What are the general characteristics of the phylum Mollusca quizlet?
phylum of organisms characterized by having a soft body, muscular foot, and (most often) a protective shell; 1)Bilaterally symmetrical. 2)Body has more than two cell layers, tissues and organs. 3)Body without cavity.
Which of the following is not true about Mollusca?
The statement given in option a is incorrect. Molluscs do not have a segmented body. Molluscs are soft-bodied animals that have a protective calcareous shell covered by a soft, spongy layer called the mantle. Mantle lies over the visceral hump also called the visceral mass.
What molluscs have a closed circulatory system?
Most mollusks have an open circulatory system but cephalopods (squids, octopus) have a closed circulatory system.
How will you describe the animals called mollusk?
Mollusks are a large group of invertebrate animals. Mollusks have soft bodies, and their bodies are not divided into rings like the segmented worms called annelids . Mollusks don’t have legs, though some have flexible tentacles for sensing their environment or grabbing things.
What are the excretory organs in Mollusca?
Organisms belonging to Phylum Mollusca excrete with the help of metanephridia. In some molluscs, the organ of Bojanus is the metanephridia which act as a kidney and performs excretion.
How many statements are true about Mollusca?
<br> Reason : All the three phyla include members with bilateral symmetry and true coelom. Assertion : Annelids, arthropods, and molluscs are protostomial coelomates .
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27 jun 2022
Which of the following statement is true for Mollusca?
Mollusca have bilateral symmetry and they have CaCO3 (calcareous) shell.
What is the function of Mollusca?
For example, mollusks are the first animals to have evolved organ systems for respiration and circulation. Those systems are essential components of higher organisms since they allow our bodies to more efficiently exchange gases with the environment.
Do molluscs have blood?
Most molluscs have blue blood because their respiratory molecule is hemocyanin, a type-3 copper-binding protein that turns blue upon oxygen binding. Molluscan hemocyanins are huge cylindrical multimeric glycoproteins that are found freely dissolved in the hemolymph.
Do mollusks have gender?
Sex change in the Mollusca is almost exclusively protandric (male to female), and has only been reported among gastropods and bivalves.
What is the scientific name of Mollusca?
Phylum. Mollusca – mollusques, molusco, molluscs, mollusks. Direct Children: Class. Bivalvia Linnaeus, 1758 – bivalves, clams, bivalves, palourdes, bivalve, mexilhão, ostra.
What structure is found only in molluscs?
There are also two unusual organs that are found exclusively in mollusks: the mantle and the radula. These organs do not persist in higher organisms, but they were important adaptations to the environments inhabited by mollusks.