Table of Contents
Can molluscs reproduce asexually?
Mollusk reproduce asexually by being hermaphroditic where they are both male and female they also asexually reproduce by budding.
What type of fertilization do molluscs have?
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.
Which of the following is true about reproduction in Mollusca?
Some species of mollusc are hermaphrodites that reproduce by internal fertilization. Therefore, option C both sexual and asexual reproduction is the correct answer. So, option C is the correct option.
Is Mollusca direct or indirect?
They are mostly found in the marine environment. The shell is either external, internal, or not present at all. They have separate sexes. The development is direct.
Is Fertilisation in Mollusca internal or external?
The simplest molluscan reproductive system relies on external fertilization, but with more complex variations. All produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults.
Are molluscs hermaphrodites?
Hermaphroditism occurs in 100% of the Solenogastres, 99% of the Opisthobranchia, 100% of the Pulmonata, 3% of the Prosobranchia and 9% of the Bivalvia. Sequential hermaphroditism, whatever its theoretical advantages over gonochorism, is not common among molluscs.
Is fertilization in molluscs external or internal?
Do snails reproduce asexually?
Some hermaphrodite snails do not need another snail to reproduce, but can make more snails all by themselves (this is called asexual reproduction). Other snails are hermaphrodites but still need another snail to reproduce (this is called sexual reproduction).
Which of the following statement is true about Mollusca?
Mollusca have bilateral symmetry and they have CaCO3 (calcareous) shell. Was this answer helpful?
Is fertilization internal or external in Mollusca?
What is respiration in Mollusca?
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.
What is internal and external fertilization?
External fertilization is a mode of reproduction in which a male organism’s sperm fertilizes a female organism’s egg outside of the female’s body. It is contrasted with internal fertilization, in which sperm are introduced via insemination and then combine with an egg inside the body of a female organism.
Are molluscs monoecious or dioecious?
Mollusca – Molluscs are monoecious, oviparous with indirect development.
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.
What is the reproduction of snail?
They don’t actually need to mate with another snail in order to reproduce, self fertilisation is possible. After mating they lay around 80 white eggs in a damp, underground nest. The newly-hatched snails have fragile shells and take about two year to mature.
Which of the following structure helps in excretion and respiration in molluscs?
These gills have respiratory and excretory functions.
Which characteristic is typical of molluscs?
The most general characteristic of molluscs is they are unsegmented and bilaterally symmetrical. The following are present in all modern molluscs: The dorsal part of the body wall is a mantle (or pallium) which secretes calcareous spicules, plates or shells.
What animals reproduce by external fertilization?
Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes. Benthic marine plants also use external fertilization to reproduce.
Where does fertilization occur in molluscs?
How do Mollusca reproduce?
Compare the nervous system of bivalves with that of cephalopods,and explain how the differences correspond to their different lifestyles.
How do mollusks reproduce?
Gaseous wastes (carbon dioxide) are removed through stomata.
What animals are asexual?
Animals that reproduce asexually include planarians, many annelid worms including polychaetes and some oligochaetes, turbellarians and sea stars. Many fungi and plants reproduce asexually. Some plants have specialized structures for reproduction via fragmentation, such as gemmae in liverworts.
What kind of animals are in the mollusk family?
Mollusks. The mollusk group spans over 50,000 known species. They include snails, clams, oysters, mussels, squid and octopods. In general, their bodies include three parts: the head, internal organs and a “foot.”. A mollusk’s foot is essentially the muscular, lower part of its body that comes in contact the ground.