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Like many invertebrates, the mollusk life cycle includes one or more juvenile or larval stages that are very different from the adult form of the animal. Both mollusks and annelids develop through a larval stage called a trochophore larva.
- What is the reproduction of mollusks?
- How long does a mollusk live?
- Do mollusks go through metamorphosis?
- What stage do mollusks grow shells?
- Do mollusks go through larval stages explain your answer?
- What is the body plan of mollusks?
- What is the habitat of a mollusk?
- How long can a mollusk live out of water?
- Where do mollusks live in the world?
- How do mollusks grow?
- What is the method of mollusks?
- How will you describe mollusk?
- Is Mollusca Oviparous or viviparous?
- Are mollusks cold blooded?
- Where does fertilization take place in mollusks?
What is the reproduction of mollusks?
Mollusks reproduce sexually. Slugs and snails are hermaphrodites (possessing both male and female organs), but they must still mate to fertilize their eggs. Most aquatic mollusks lay eggs that hatch into small, free-swimming larvae called veliger.
How long does a mollusk live?
The oldest mollusk is a bivalve, the ocean quahog (Arctica islandica), native to the northern Atlantic and known to live at least 500 years; it is also the oldest known animal.
Do mollusks go through metamorphosis?
Metamorphosis, the transition of free-swimming larvae to benthic and often sessile and attached juveniles, is one of the most distinctive life changing events in many molluscan species.
What stage do mollusks grow shells?
Within about six hours, a fertilized egg develops into a free-swimming larva that will develop a shell within 12 to 24 hours.
Do mollusks go through larval stages explain your answer?
Both mollusks and annelids develop through a larval stage called a trochophore larva. Trochophore larvae are characterized by having a band of cilia that wraps around the body. ... Some mollusks, particularly gastropods, also have a second larval stage that is not present in any other phylum, called veliger.
What is the body plan of 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. Each class possesses some variation on this basic plan. The organization of the gastropod body is very similar to the basic body plan of mollusks.
What is the habitat of a mollusk?
Habitat and Locomotion
Most mollusks are marine animals; some are found in shallow coastal areas and others live in the deepest parts of the ocean. Most live in the bottom sediments, though the cephalopods are primarily free-swimming species.
How long can a mollusk live out of water?
They can also attach to aquatic plants. Adult mussels can survive out of water – less than five days in dry conditions, but up to 21 days in very wet conditions (such as inside dock/lift pipes).
Where do mollusks live in the world?
Mollusks live in most terrestrial, freshwater, and marine habitats. However, the majority of species live in the ocean. They can be found in both shallow and deep water and from tropical to polar latitudes. Mollusks are a major food source for other organisms, including humans.
How do mollusks grow?
To make space for their growing body, molluscs have to gradually enlarge and extend their shells by adding new layers of those building blocks – calcium, carbonate and proteins. The newest part of the sea snail's shell, for example, is around the opening where the animal pokes out.
What is the method of mollusks?
Mollusks are primarily of separate sexes, and the reproductive organs (gonads) are simple. Reproduction via an unfertilized gamete (parthenogenesis) is also found among gastropods of the subclass Prosobranchia. Most reproduction, however, is by sexual means.
How will you describe mollusk?
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.
Is Mollusca Oviparous or viviparous?
Birds, reptiles, amphibians, most fish, insects, mollusks, arachnids, and monotremes are oviparous animals. Most mammals are viviparous animals.
Are mollusks cold blooded?
Mollusks are soft bodied, cold-blooded invertebrates that are covered with a shell made of calcium carbonate.
Where does fertilization take place in mollusks?
Fertilization can be either internal or external depending on the class and species. Internal fertilization takes place when the male transfers sperm into the body of the female through mating. During external fertilization, the female lays eggs, and they are fertilized by the male sperm outside of the female's body.
