Terrestrial mollusk species have primitive lungs that absorb oxygen directly from the air around them. As we discussed earlier, the gills are located in the water-filled mantle cavity. All mollusks except those in the class Cephalopoda have an open circulatory system.
- 1 Do mollusks have lungs?
- 2 Do molluscs have gills or lungs?
- 3 Do all mollusks have organs?
- 4 What do all Mollusca have in common?
- 5 Which characteristic do all mollusks have?
- 6 Do mollusks have a respiratory system?
- 7 How do land mollusks breathe?
- 8 Do mollusks have tissues?
- 9 What kind of structure do all mollusks use for obtaining oxygen?
- 10 Do all mollusks have gills?
- 11 What are the respiratory organs of molluscs?
- 12 Which of the following does not belong to phylum Mollusca?
- 13 Do all molluscs have gills?
- 14 What are two main parts in all mollusks?
- 15 What three structures do all mollusks have?
- 16 Do mollusks breathe through their skin?
- 17 How do crustaceans breathe?
- 18 Which of the following is not a characteristic shared by all Mollusca?
- 19 Are mollusks Autotrophs or Heterotrophs?
- 20 What three characteristics do all molluscs share that make them molluscs?
- 21 How do Cnidaria breathe?
- 22 Do all mollusks have an open circulatory system?
- 23 How do cephalopods breathe?
- 24 Does a Mollusca have a shell?
- 25 Are mollusks that have a single shell?
- 26 What systems do mollusks have?
- 27 Are mollusks cold blooded?
- 28 Do all mollusks have eyes?
- 29 How molluscs differ from other phylum describe?
- 30 What structure covers organs of mollusks?
- 31 Do mollusks have intracellular or extracellular digestion?
- 32 Do Mollusca have a closed circulatory system?
- 33 Which class of molluscs uses gills for respiration?
- 34 What is pulmonary sac in molluscs?
- 35 Which of the following does not belong to phylum Cnidaria?
- 36 Which of the following does belongs to Mollusca?
- 37 What class is an octopus?
- 38 How do mollusks and echinoderms breathe?
- 39 How do Cephalopods differ from other molluscs?
- 40 Which group of mollusks use their gills to breathe and catch food?
- 41 How do sponges breathe?
- 42 How do mollusks defend themselves?
- 43 Do crustaceans have lungs?
- 44 Do arachnids have lungs?
- 45 Do crustaceans breathe oxygen?
- 46 How are mollusks and earthworms different?
- 47 Are molluscs parasitic?
- 48 Do mollusks have true organs?
- 49 How do molluscs breathe?
- 50 What is the main characteristic that all Mollusca have in common?
- 51 How characteristic do crustacean and mollusk have in common?
- 52 Which one of the following features does not belong to phylum Mollusca?
- 53 Do mollusks have gills?
- 54 Which of the following does not apply to Mollusca?
Do mollusks have lungs?
As well as a shell, most mollusks have a muscular foot for creeping or burrowing. Some also have a head with sense organs. The soft body includes lungs or gills for breathing, and digestive and reproductive parts, all enclosed by a skinlike organ called the mantle.
Do molluscs have gills or lungs?
The mantle creates a small empty space called a mantle cavity, which is modified for different functions in different groups of molluscs. Within the mantle cavity hang the gills, highly complex and greatly folded sheets of tissue. Gills are used to exchange oxygen and carbon dioxide in respiration.
Do all mollusks have organs?
All mollusks have: a visceral mass containing internal organs, including the digestive tract, paired kidneys, and reproductive organs. a mantle that surrounds but does not cover entirely the visceral mass and secretes a shell (if one is present). The mantle also contributes to formation of gills or lungs.
What do all Mollusca have in common?
Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.
Which characteristic do all mollusks have?
Mollusks have a soft body and share several characteristics, including a muscular foot, a visceral mass of internal organs, and a mantle.
Do mollusks have a respiratory system?
Basically all molluscs breathe by gills that are called ctenidia (comb-gills) because of their comb-like shape. In terrestrial molluscs this respiration organ is reduced, but still respiration takes place in the pallial cavity. That is why it is also called the snail’s respiratory cavity.
How do land mollusks breathe?
Terrestrial mollusks exchange gases with the surrounding air. This occurs across the lining of the mantle cavity. Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water.
Do mollusks have tissues?
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.
What kind of structure do all mollusks use for obtaining oxygen?
– water living mollusks have gills. – circulatory system in which the heart pumps blood into open spaces in the body and blood is not confined to blood vessels. – organ that removes oxygen from water; containing tiny hairlike structures called cilia & a rich supply of blood vessels.
Do all mollusks have gills?
Respiration. Most molluscs have only one pair of gills, or even only a singular gill. Generally, the gills are rather like feathers in shape, although some species have gills with filaments on only one side. They divide the mantle cavity so water enters near the bottom and exits near the top.
What are the respiratory organs of molluscs?
A ctenidium is a respiratory organ or gill which is found in many mollusks. This structure exists in bivalves, cephalopods, Polyplacophorans (chitons), and in aquatic gastropods such as freshwater snails and marine snails.
Which of the following does not belong to phylum Mollusca?
Trematoda do not belong to phylum Mollusca It is a class of phylum Platyhelminthes.
Do all molluscs have gills?
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 two main parts in all mollusks?
The body plan of a mollusk usually consists of a head region, a muscular foot, and a visceral mass of internal organs that is often contained within a dorsal shell.
What three structures do all mollusks have?
The basic body structure, consisting of a foot, visceral mass, and mantle, is similar in most mollusks. The foot is located below the visceral mass.
Do mollusks breathe through their skin?
Land snails and slugs do not have gills; they respire using a mantle cavity that has a large surface area lined with blood vessels. Diffusion occurs through moist skin of the mollusks; they prefer to live in moist conditions.
How do crustaceans breathe?
Larger aquatic crustaceans primarily use gills for respiration. These feathered surfaces contain membranes that bind to dissolved oxygen in the water as water passes over.
They are triploblastic as they have three primary tissue layers as endoderm, mesoderm and ectoderm. They do not possess a segmented body. So, the correct answer is option B.
Are mollusks Autotrophs or Heterotrophs?
Yes, all mollusks are heterotrophic, because mollusks are animals, and all animals are heterotopic, meaning that they need to consume organic carbon…
Main characteristics of Mollusca :
There are three distinct body zones: a head-foot, a visceral mass and a mantle.
How do Cnidaria breathe?
Cnidarians don’t have lungs, and even though they live in aquatic environments they don’t have gills either. So they have to exchange ‘good’ and ‘bad’ gases a little bit differently. Instead of breathing, gas exchange in Cnidarians occurs through direct diffusion.
Do all mollusks have an open circulatory system?
Most mollusks have an open circulatory system but cephalopods (squids, octopus) have a closed circulatory system. The blood pigment of mollusks is hemocyanin, not hemoglobin.
How do cephalopods breathe?
All cephalopods have either arms or tentacles, have blue-colored blood, and have the ability to use propulsion to help them move swiftly when needed. They use gills to breathe and are invertebrates (lack backbones).
Does a Mollusca have a shell?
mollusk, also spelled mollusc, any soft-bodied invertebrate of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body.
Are mollusks that have a single shell?
They include the scallops, oysters, mussels, and clams. Gastropods, on the other hand, have only one shell, meaning they have an opening on one side.
What systems do mollusks have?
The Phylum shares features with other animal phyla. The mollusks are bilaterally symmetrical, have an organ system level of body organization, have a complete digestive system, and a coelom (small in size). Additionally these animals have a circulatory system and a respiratory system.
Are mollusks cold blooded?
Mollusks are soft bodied, cold-blooded invertebrates that are covered with a shell made of calcium carbonate.
Do all mollusks have eyes?
Diversity. There are between seven and eleven distinct eye types in molluscs. Molluscs have eyes of all levels of complexity, from the pit eyes of many gastropods, to the pinhole eyes of the Nautilus, to the lensed eyes of the other cephalopods.
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: All molluscs have a specialized foot used in digging, grasping, or creeping.
What structure covers organs of mollusks?
All mollusks have a thin layer of tissue called a mantle which covers their internal organs. The mantle produces the mollusk’s shell.
Do mollusks have intracellular or extracellular digestion?
Digestive enzymes are secreted into the lumen of these glands. Additional extracellular digestion takes place in the stomach. In cephalopods, digestion is entirely extracellular. In the most other mollusks, the terminal stages of digestion are completed intracellularly, within the tissue of the digestive glands.
Do Mollusca have a closed circulatory system?
Mollusks have an open circulatory system, meaning the blood does not circulate entirely within vessels but is collected from the gills, pumped through the heart, and released directly into spaces in the tissues from which it returns to the gills and then to the heart.
Which class of molluscs uses gills for respiration?
The hard shell is secreted by a thin sheet of tissue, which is known as the mantle. It encloses the internal organs. The gill hangs within the mantle cavity that is used to exchange oxygen and carbon dioxide during respiration. Gills are also used for filter-feeding apart from respiration in some bivalves.
What is pulmonary sac in molluscs?
Within the mantle cavity hang the gills which are used to exchange oxygen and carbon dioxide in respiration. In certain bivalves, gills are used for respiration as well as for filter feeding. Pulmonary sac or cavity is an organ of aerial respiration and is found in land molluscs.
Which of the following does not belong to phylum Cnidaria?
Sea cucumber is an echinoderm from the class Holothuroidea as it has a spiny skin. They are marine animals and have an elongated body with branched gonad. Whereas sea pen or sea feather and sea fan are the Coelenterates. Thus, the correct answer is option C.
Which of the following does belongs to Mollusca?
The animals belonging to the phylum Mollusca are apple snail, pearl oyster, devil fish, tusk shell, etc.
What class is an octopus?
How do mollusks and echinoderms breathe?
Echinoderms have a unique water vascular system. This network of fluid-filled tubes helps them to breathe, eat, and move. Therefore, they can function without gill slits.
How do Cephalopods differ from other molluscs?
The most obvious difference between most cephalopods and other mollusks is the apparent lack of a shell. Octopuses do not have shells at all, while squids have a small internal shell. (Nautiluses, which are found in the South Pacific and Indian oceans, are the only cephalopods with an external shell.
Which group of mollusks use their gills to breathe and catch food?
Bivalves include clams, scallops, oysters, and mussels. As their name implies, they have two parts of their shell, which can open and close. Bivalves live in both marine and freshwater habitats. Most bivalves have a pair of large gills that enable them to extract oxygen from the water (to breathe) and to capture food.
How do sponges breathe?
Sponges are animals that belong to the phylum Porifera, which means “pore-bearing.” Sponges breathe by moving water through pores, called ostia, which cover their body. Sponges respire through a process called diffusion.
How do mollusks defend themselves?
Mollusks have soft bodies, which makes them easy prey for many other kinds of animals. And so, mollusks have evolved many ingenious ways to protect themselves. On way that mollusks protect themselves is to build a hard shell around their bodies. Clams, oysters, snails, mussels, and scallops all have shells.
Do crustaceans have lungs?
As they are aquatic creatures, they use the same respiratory system as fish and breath oxygen through gills. Gills, a crustacean respiratory organ, are very similar to lungs in the way that they function. Small molecules of oxygen get pulled into the blood stream as they pass over the gill’s or lung’s surface.
Do arachnids have lungs?
Two types of respiratory organs are found among arachnids: book lungs and tracheae. Book lungs are found in hardened pockets generally located on the underside of the abdomen.
Do crustaceans breathe oxygen?
Crabs breathe through gills. For gills to work, they must be able to take in oxygen and transport it into the animal’s bloodstream. The gills of crabs are located under the carapace near the first pair of walking legs. The oxygen that crabs need is taken into the gills either through water or moisture in the air.
How are mollusks and earthworms different?
Most mollusks have shells. Annelids are worms such as the familiar earthworm. They have segmented bodies. Annelids look like roundworms on the outside, but on the inside they are more like mollusks.
Are molluscs parasitic?
This chapter describes several species of mollusks belonging to the family Pyramidellidae that are reported as parasites of commercially important marine mollusks. The pyramidellids are all parasites, with mollusks and annelids being the most common hosts.
Do mollusks have true organs?
Mollusks have a coelom and several organ systems. Most also have a shell, head, foot, and radula, which is a feeding organ. Mollusks are either free-living heterotrophs or parasites.
How do molluscs breathe?
Aquatic mollusks “breathe” under water with gills. Gills are thin filaments that absorb gases and exchange them between the blood and surrounding water.
What is the main characteristic that all Mollusca have in common?
Molluscs are a clade of organisms that all have soft bodies which typically have a “head” and a “foot” region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.
How characteristic do crustacean and mollusk have in common?
Crustaceans are aquatic animals that have jointed legs, a hard shell and no backbone, such as crab, crayfish, lobster, prawns and shrimp. Most molluscs have a hinged two-part shell and include clams, mussels, oysters and scallops, as well as various types of octopus, snail and squid.
Which one of the following features does not belong to phylum Mollusca?
Trematoda do not belong to phylum Mollusca It is a class of phylum Platyhelminthes.
Do mollusks have gills?
Respiration. Most molluscs have only one pair of gills, or even only a singular gill. Generally, the gills are rather like feathers in shape, although some species have gills with filaments on only one side. They divide the mantle cavity so water enters near the bottom and exits near the top.
Which of the following does not apply to Mollusca?
But molluscs are characterised by the unsegmented soft body covered with the hard calcareous shell. Its body consists head, muscular foot and visceral hump. Thus, the correct answer is option D.