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2021-05-14

What is the function of Spicule other than to support?

What is the function of Spicule other than to support?

cWhat function other than support might spicules serve? Spicules are structural elements in sponges that provide structural support and protection against predators. They also help the larvae stay afloat.

What are the functions of spicules?

Spicules are structural elements found in most sponges. They provide structural support and deter predators. Large spicules that are visible to the naked eye are referred to as megascleres, while smaller, microscopic ones are termed microscleres.

What are some possible functions of spicules and Spongin?

Answer: Spongin and sponge spicules are the skeletal structures of the sponge body. Like all skeletons, they support the soft tissues of the body. The sharp spicules and the softer spongin are arranged in a complex three-dimensional latticework that holds up the cells and gives the sponge its shape.

Why are spicules used as a primary characteristic in the taxonomy of sponges?

Spicules act as a skeleton to give support & shape to the sponge, including keeping the pores and osculum open. Their sharp point may also help protect the sponges from being eaten by predators. Their sharp point may also help protect the sponges from being eaten by predators.

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What are the three types of spicules?

Based on the number of axis present in the rays spicules may be of three types: monoaxon, triaxon and polyaxon. Monaxon: These spicules grow along a single axis. These may be straight needle-like or rod-like or may be curved. Their ends may be pointed, knobbed or hooked.

What are the different types of spicules?

Accordingly spicules are of two types:

  • Calcareous spicules: The organic material in this type of spicules is calcium carbonate or calcite.
  • Siliceous spicules: The organics material in this type of spicules is Colloidal silica or Silicon.
  • Megascleres: These are larger spicules constituting main skeleton of sponge body.

What are the 2 functions of spicules?

The mineral skeleton is formed for the most part by units called spicules, either scattered throughout the sponge or united to form fibres; spicules are classified as megascleres, which function in support, and microscleres, which function in protection and also aid in support.

Do sponges skeleton?

Sponges, like all animals, possess some sort of a skeleton that gives their bodies shape. As a whole, poriferans have diverse skeletal elements including calcareous laminae, organic filaments, and siliceous and calcareous spicules.

What is meant by Gemmules?

Gemmules are internal buds found in sponges and are involved in asexual reproduction. It is an asexually reproduced mass of cells, that is capable of developing into a new organism i.e., an adult sponge.

How do Gemmules help sponges?

How do gemmules help some freshwater sponges survive unfavorable conditions? Gemmules are food units that also have sponge cell. The units can survive harsh conditions, so if the sponge dies, a new one reforms from the food unit. while the sponge itself is sessile, the spores and gametes it releases are not.

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What cells are found in Gemmules of sponges?

  • Gemmules are the asexual reproductive bodies which are formed by endogenous budding in all freshwater and some marine sponges.
  • B.
  • C.
  • D.
  • Since, regeneration of sponges by means of gemmules is due to archaeocytes, therefore these archaeocytes are the reproductive cells present in gemmules.

What are Gemmules and conidia?

Text Solution. Solution : Gemmule-asexual reproductive structure in SQPonges. Conidia-asexual reproductive structure in Penicillium. ( or any other correct example)

Where is conidia found?

Conidium, a type of asexual reproductive spore of fungi (kingdom Fungi) usually produced at the tip or side of hyphae (filaments that make up the body of a typical fungus) or on special spore-producing structures called conidiophores. The spores detach when mature.

What is the economic importance of sponges?

The best commercial sponges are found in the warm water of the Mediterranean Sea. Sponges have a great capacity to absorb water. So they are used in surgical operations for absorbing fluid and blood. Sponges are also used for sound absorption in buildings.

How 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. Asexual reproduction is mainly carried out by budding and also by gemmulation. The internal buds, which are formed by the freshwater sponges are called gemmules.

How do sponges reproduce sexually?

Sponges may 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.

What is budding in sponges?

Asexual Reproduction of Sponges External budding is when a portion of the sponge breaks off and then regenerates into a complete organism. Internal budding takes place by the formation of internal buds called gemmules.

Which type of reproduction is found in hydra?

budding

Is Hydra a plant or animal?

Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about 30 millimetres (1.2 inches) long but is capable of great contraction.

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Is a hydra multicellular?

Hydra is a multicellular organism. They have a tubular body and have different sizes.

Why Hydra is a multicellular animal?

Answer. Hydras are multicellular organisms. This is due to the simple fact that they have a tubular body and have different sizes. Talking about reproduction, they indulge in budding which is another fact that supports as to why they are multicellular organisms.

What is Hydra in The Avengers?

HYDRA is the branch of the Nazi-Germany Army of World War II under the command of Johann Schmidt. It was an SS sub-division that created advanced weaponry for the army.

Can Hydra kill bettas?

They aren’t in any way parasitic, so wont ‘feed’ on your bettas. The majority are predators, so will only try to eat what they can actually kill. I reckon in your tank, unless they’re photosynthetic or herbivores, they’ll probably just die out.

Is brain found in hydra?

R: All its neurons are apolar and connected. A: Hydra has a nerve net but no brain.

Which animal brain is absent?

Hydra

What is unique about the human brain?

Dendrites in the cortex of the human brain are much longer than those in rats and most other species, because the human cortex has evolved to be much thicker than that of other species. In humans, the cortex makes up about 75 percent of the total brain volume, compared to about 30 percent in the rat brain.

Does Hydra have nervous system?

Hydra possesses one of the anatomically simplest nervous systems—a diffuse nerve net spread throughout the body with no signs of centralization (Figures 2 and 3A). It is made up of about 6.000 nerve cells belonging to two morphological types—sensory and ganglion neurons.