How are pearls formed? Why are molluscs the only organisms to have this ability? Explain your answers by stating the parts of the mollusc that are involved in this process.

Q: How is the excretory system of molluscs characterized?

A: The mollusks are diverse morphologically and live in many types of environments. It includes snails,…

Q: Why do we have to use special techniques for the recovery of pinworm eggs? Explain

A: Introduction : Pinworms are typically located in the anus or the proximity of the anus, where they…

Q: The shells of molluscs have 3 layers. Which is not one (nacreous/mantle/periostracum)?

A: All animals are classified according to their presence of characteristics such as characters,…

Q: How do vessicles move in a cell?

A: Vesicle is a structure located inside or outside the cell, consisting of liquid or cytoplasm…

Q: #18: This is Ulva; which of the following terms describes its morphology: unicellular, colonial,…

A: Seaweeds are multicellular, small, marine algae that grow along seashores. They form the food source…

Q: What is the function of the snail shell used by the hermit crabs? Do you think it could survive…

A: Hermit crabs, distributed worldwide, occur in coastal waters with sandy or muddy bottoms, and…

Q: In the different lineages of molluscs, it is easy to understand the variations from the basic…

A: Molluscs are very diverse animals which include snails, octopuses, squids, oysters, clams, etc. The…

Q: Certain mollusk shells can be much tougher than others, but are not extremely tough compared to many…

A: Introduction  Molluscan are the mostly marine sometime also found in fresh water and on land. These…

Q: The opening of a gastropod shell is called the (spire/aperture/whorl/spine)

A: The Gastropods belong to the class Gastropoda which is under the phylum mollusca. The gastropods are…

Q: In which habitats do molluscs live?

A: Mollusks are the invertebrate organism with a soft body. They are herbivore organisms except for the…

Tissue renewal

In multicellular organisms, tissue is a level of structure that consists of a group of physically and functionally identical cells and their intercellular substances. Unicellular organisms do not have tissues. Tissues are absent or poorly differentiated even in the simplest multicellular animals, such as sponges. However, more evolved multicellular animals and plants have specialized tissues that may organize and govern an organism's reaction to its surroundings. The word tissue is derived from the Latin word 'weave.' Plants and animals have various kinds of tissue systems that differ in their work and composition according to the different requirements.