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Circulatory system Although molluscs are coelomates, their coeloms are reduced to fairly small spaces enclosing the heart and gonads. The main body cavity is a hemocoel through which blood and coelomic fluid circulate and which encloses most of the other internal organs.
- Does Mollusca have Coelomate?
- Are Mollusca Pseudocoelomates?
- Are molluscs and annelids Coelomates?
- Is Mollusca Acoelomate Pseudocoelomate or Coelomate?
- Is Mollusca segmented?
- Is Mollusca a bilateral symmetry?
- Are Cnidaria Coelomates?
- How do molluscs reproduce?
- Do Mollusca have jointed appendages?
- Do molluscs have tissue?
- Which of the following is true about reproduction in Mollusca?
- How molluscs differ from other phylum describe?
- What defines Mollusca?
Does Mollusca have Coelomate?
Both molluscs and annelids probably evolved from free-living flatworms. ... But molluscs have developed a true coelom, an internal body cavity enclosed by mesodermal membranes. The coelom in molluscs, however, is strangely reduced to a small space around the heart, sometimes called a hemocoel.
Are Mollusca Pseudocoelomates?
mollusks are pseudocoelomates. ... mollusks have a two-opening one-way digestive tract.
Are molluscs and annelids Coelomates?
Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion. ... Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain.
Is Mollusca Acoelomate Pseudocoelomate or Coelomate?
The protostome coelomates (acoelomates and pseudocoelomates are also protostomes) include the mollusks, annelids, arthropods, pogonophorans, apometamerans, tardigrades, onychophorans, phoronids, brachiopods, and bryozoans.
Is Mollusca segmented?
The phylum Mollusca is the second most diverse phylum after Arthropoda with over 110,000 described species. Mollusks may be primitively segmented, but all but the monoplacophorans characteristically lack segmentation and have bodies that are to some degree spirally twisted (e.g. torsion).
Is Mollusca a bilateral symmetry?
Mollusca can be found in freshwater, marine and terrestrial habitats. More features of molluscs include bilateral symmetry, soft or unsegmented bodies, respiration via ctenidium, ganglia/nerve comprised nervous system, haemocoel body cavity, etc.
Are Cnidaria Coelomates?
Cnidarians are not considered to have a coelom because they are diploblastic, so they don't have any mesodermic tissue. Cnidaria are a phylum consisting of aquatic animals like jellyfish, anemones, and corals.
How do molluscs reproduce?
Mollusks are primarily of separate sexes, and the reproductive organs (gonads) are simple. ... Most reproduction, however, is by sexual means. Eggs and sperm are released into the water by members of some (primitive) species, and fertilization occurs there.
Do Mollusca have jointed appendages?
Summary – Mollusks vs Arthropods
Phylum Molluska and Phylum Arthropoda are two major phyla of the Kingdom Animalia. Mollusks are soft-bodied animals with a shell while arthropods are animals with segmented bodies. They also have paired jointed appendages and an exoskeleton.
Do molluscs have tissue?
Mollusks have a hard outer shell. There is a layer of tissue called the mantle between the shell and the body. Most mollusks have tentacles for feeding and sensing, and many have a muscular foot. Mollusks also have a coelom, a complete digestive system, and specialized organs for excretion.
Which of the following is true about reproduction in Mollusca?
The simplest species of molluscan reproductive system relies on external fertilization. ... Some species of mollusc are hermaphrodites that reproduce by internal fertilization. Therefore, option C both sexual and asexual reproduction is the correct answer.
How molluscs differ from other phylum describe?
Although there is no single feature that all molluscs possess, three features are so common in molluscs that they are used to distinguish them from organisms in other phyla: ... Molluscs have a mantle or mass of soft flesh that covers the soft body and encloses the internal organs.
What defines Mollusca?
Definition of mollusk
: any of a large phylum (Mollusca) of invertebrate animals (such as snails, clams, or squids) with a soft unsegmented body usually enclosed in a calcareous shell broadly : shellfish.
