Question: Which Of The Following Is A Connecting Link Between Protozoa And Sponges?

What is found in sponge?

Sponge skeletons are made up of hard, rod-like projections called spicules and a protein called collagen.

As discussed in Sponges: Characteristics and Classification, sponge classes are based on the composition of the spicules.

Spicules made of calcium carbonate or silica are secreted by cells called sclerocytes..

Which sponge is found in river?

Nearly all sponges are sea animals, but one family, the Spongillidae, live in fresh water. There are five British species, two common ones being the River Sponge (Ephydatia [or Spongilla] fluviatilis) and the Pond Sponge (Euspongilla [or Spongilla] lacustris).

What protozoa means?

Protozoa are single celled organisms. They come in many different shapes and sizes ranging from an Amoeba which can change its shape to Paramecium with its fixed shape and complex structure.

Why are sponges considered to have surpassed that level of organization?

Sponges have cellular-level organization, meaning that that their cells are specialized so that different cells perform different functions, but similar cells are not organized into tissues and bodies are a sort of loose aggregation of different kinds of cells.

Proterospongia is a colonial choanoflagellate protozoan that closely resembles a sponge and act as connecting link between Protozoa and Porifera. It is a genus of single-celled aquatic organisms which form colonies. It consists of a number of cells embedded in a jelly-like matrix.

Connecting link is an organism having characteristics of two different group of organisms e.g, duck-billed platypus ( scientific name Ornithorhynchus anatinus) is a connecting link between reptiles and mammals i.e, it has mammary glands to feed its young ones like other mammals e.g human being, cow, buffalo etc., and …

What is the difference between protozoa and porifera?

Protozoa are single-celled animal-like organisms such as paramecium, amoebas, etc. Porifera is simply the phylum for sponges. Porifera means “pore bearer” because sponges have holes or pores in which they filter food from the water.

What is the definition of porifera?

: a phylum of primitive invertebrate animals comprising the sponges and having a cellular grade of construction without true tissue or organ formation but with the body permeated by canals and chambers through which a current of water flows and passes in its course through one or more cavities lined with choanocytes.

What characteristics do the sponges have in common with the protozoans?

Similarities Between Sponges and Protozoa Sponges and protozoa are two forms of primitive animals with a cellular level of organization. They do not develop tissues and all the functions of the body occur inside individual cells. Also, they are heterotrophs and their digestion of food occurs inside the cell.

Which of the following is a member of phylum porifera?

Answer. sycon,Leucosolenia & Spongilla belongs to same phylum that is phylum Porifera!!

researches on the wormlike organism Peripatus, which he recognized as the zoologically important connecting link between the Annelida, or segmented worms, and the Arthropoda, such as crabs, spiders, and insects.

How do sponges reproduce asexually?

Sponges have three asexual methods of reproduction: after fragmentation; by budding; and by producing gemmules. Fragments of sponges may be detached by currents or waves.

Why are sponges not considered protozoans?

Unlike Protozoans, the Poriferans are multicellular. However, unlike higher metazoans, the cells that make up a sponge are not organized into tissues. Therefore, sponges lack true tissues and organs; in addition, they have no body symmetry. Sponges do, however, have specialized cells that perform specific functions.

What are the characteristics of porifera?

Characteristics of Phylum PoriferaThe cells of Poriferans are loosely organized.They are mostly found in marine water. … They are either radially symmetrical or asymmetrical.Their body is usually cylindrical.The scleroblast secretes spicules while spongin fibres are secreted by spongioblasts.More items…

What is difference between Monera and Protista?

The basic difference between them is – Monera are unicellular and prokaryotic cellular structures, whereas Protista are unicellular and eukaryotic cellular structure. Cell organelles are absent in Monera, but Protista is well-defined and has membrane-bound organelles.

What is the difference between connecting link and Missing Link?

The living animals which possess characters of two different groups of animals are known as connecting links. … On the other hand, missing links are those extinct organisms which had the characters of two different groups of animals.

PERIPATUS is a connecting link between ANNELIDA and ARTHROPODA… LIMULUS is a living fossil also known as KING CRAB…so option D is correct.. Peripatus is the connecting link betwèen anelida and arthropoda .