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How do molluscs excrete?
The vast majority of mollusks are aquatic and excrete nitrogen in the form of ammonia. In octopuses, however, nitrogen is excreted as ammonium chloride, which is quite strongly concentrated in the urine. Terrestrial snails and slugs excrete uric acid but may also excrete ammonia when living in moist surroundings.
What is the excretory organ in Mollusca?
The organs of Bojanus or Bojanus organs are excretory glands that serve the function of kidneys in some of the Molluscs. In other words, these are metanephridia that are found in some molluscs, for example in the bivalves. Some other molluscs have another type of organ for excretion called Keber’s organ.
Do mollusks have organ systems?
Most mollusk have two organs that are unique to this phylum: a specialized feeding organ called a radula and a dorsal layer of tissue called a mantle. Mollusks are the first animals to have evolved organ systems for respiration and circulation.
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.
How do arthropods excrete?
Arthropods excrete by means of malphigian tubules, projections of the digestive tract that help conserve water. Terrestrial forms excrete nitrogen as uric acid, as do birds. Their waste is nearly dry, a superb adaptation to life on land. Arthropods have an open circulatory system, and separate sexes.
Which structure helps in excretion and respiration in Mollusca?
Answer: (2) feather like gills.
Which of the following does not have an excretory system?
In the members of phylum – Echinodermata like Asterias (starfish) , Echinus (sea urchin ) , Antedon (sea lily) , Cucumaria (sea cucumber) and Ophiothrix (brittle star) excretory system is absent .
What is the function of the mantle of mollusks?
The mantle cavity functions as a respiratory chamber in most mollusks. In bivalves it is usually part of the feeding structure. In some mollusks the mantle cavity is a brood chamber, and in cephalopods and some bivalves such as scallops, it is a locomotory organ. The mantle is highly muscular.
Do mollusks use diffusion?
All mollusks except those in the class Cephalopoda have an open circulatory system. They have evolved a closed circulatory system that is not dependent on diffusion for blood to reach tissues throughout the body.
What is the excretory system of the Mollusca?
The phylum mollusca is a large phylum of invertebrate animals. There are about 85,000 recognized species of mollusks. Three types of mollusks are slugs, oysters,and squids. The primary organs in the excretory system of a slug are the nephridia. These organs produce either ammonia or uric acid as a waste product.
What are the characteristics of mollusks?
Most mollusks are snails or slugs. The basic definition of a mollusk is an organism that has a soft, bilaterally similar, and un-segemnted body with a shell on top. Most mollusks have a basic excretory system. First, contaminants are filtered by a pair of nephridia, which are like kidneys.
What is the excretory system of a snail?
The Mollusca excretory process involves a the organ of the kidney. This organ filters waste from the organism from the blood. The majority of the species within the phylum also have a organ called the nephidrium, which help maintain a balance of fluids within the body. Garden Snails (Cornu aspersum)
What is the phylum Mollusca made of?
Mollusca The phylum Mollusca is made up of the invertebrate organisms that we call mollusks. They are the largest marine phylum, making up 23% of all marine life, however there are also terrestrial mollusks as well. Most mollusks have a basic excretory system. First, contaminants are filtered by a pair of nephridia, which are like kidneys.