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2021-05-14

Which structures are found on sponges?

Which structures are found on sponges?

The special cells of the sponge include those that filter sea water; cells that are phagocytic (that engulf and digest food particles); those that form the external ‘skin’, breathing pores and tubes through which water enters and leaves the body; and those that secrete the mineral and organic skeletons, called spicules …

How do sponges move?

It’s a cell that has three basic parts: flagella, collar, and cell body. Sponges use the flagella to move when they are larvae. The flagella and collar work together to gather food. Sponges even use the choanocyte when it’s time to reproduce.

What are the pores on sponges called?

In addition to the osculum, sponges have multiple pores called ostia on their bodies that allow water to enter the sponge. In some sponges, ostia are formed by porocytes, single tube-shaped cells that act as valves to regulate the flow of water into the spongocoel.

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What is the function of Spongocoel in sponges?

Answer: Water is pumped directly through pores, called ostia, into the spongocoel and then out of the sponge through an opening called the osculum (plural oscula). The spongocoel is lined with specialized digestive cells called choanocytes that filter and take in food.

What does Spongocoel mean?

A spongocoel (/ˈspɒŋɡoʊˌsiːl/) is the large, central cavity of sponges. Water enters the spongocoel through hundreds of tiny pores (Ostia) and exits through the larger opening (osculum). Porococytes–These cells line the pores of the sponge. They are the structure through which water is taken into the organism.

Why are Gemmules formed?

An asexually produced mass of cells, which are capable of developing into a new organism or into an adult freshwater sponge is termed as a Gemmule. They are small bud-like cells, which are formed by sponges to withstand unfavourable environmental conditions.

How do sponges reproduce sexually and asexually?

In sexual reproduction, they may play either role. The ‘male’ sponge would release sperm into the water, which would travel and then enter a ‘female’ sponge. After fertilization in the sponge, a larva is released into the water. Sponges are also able to reproduce asexually through budding.

Does obelia have a medusa stage?

Through its life cycle, Obelia take two forms: polyp and medusa. During the polyp stage, the mouth is situated at the top of the body, surrounded by tentacles, whereas during the medusa stage, the mouth is situated at the distal end of the main body structure. Four gonads lie in this main body structure, or manubrium.

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What is the difference between Medusa and polyp?

While in other cnidarian classes such as cubozoa or rhizostomeae medusa are produced by the metamorphosis of the polyp. Difference Between Polyp and Medusa: Polyp is a sessile life stage of the cnidaria phylum whereas medusa is totally opposite i.e they have a mobile life cycle stage of the cnidaria phylum.

Which cnidarians has no medusa stage?

The class Anthozoa includes all cnidarians that exhibit a polyp body plan only; in other words, there is no medusa stage within their life cycle. Examples include sea anemones, sea pens, and corals, with an estimated number of 6,100 described species.

Is a hydra a polyp?

Hydra are small polyps from 1 to 20 mm in body length. The body is crowned by up to 10 or 12 tentacles. Usually the tentacles are of approximately the same length as the body, but may be somewhat shorter, particularly in the green hydra, and can exceed 20 cm in length in hungry brown hydra in quiet water.

Is the Hydra immortal?

Hydras are a genus of the Cnidaria phylum. All hydra cells continually divide. It has been suggested that hydras do not undergo senescence, and, as such, are biologically immortal.

What is the importance of Hydra?

The hydra has the ability to develop into a full organism even with all of its stem cells fully depleted creating a promising future without the use of stem cells for medical treatments….

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What limits the body size of Hydra?

The exoskeleton must shed in order for the organism to grow and this limits the size of the organism. For Endoskeletons, the bone is heavy and so makes an organism with an endoskeleton heavier than one with an exoskeleton of the same size.

What is a hydra dragon?

The Lernaean Hydra was a dragon-like water serpent with fatally venomous breath, blood and fangs, a daughter of Typhon and Echidna. The creature was said to have anywhere between five and 100 heads, although most sources put the number somewhere between seven and nine.

What two organisms are closely related to Hydra?

two organisms that are related to hydra include jellyfish and sea anemones.