Table of Contents
- 1 What are 5 characteristics of sponges?
- 2 What are 3 characteristics of sponges?
- 3 What is the description of porifera?
- 4 What makes a porifera a porifera?
- 5 What are the unique characteristics of sponges that make them especially suited for medical use?
- 6 Why are sponges classified as porifera?
- 7 What is the characteristics of phylum?
- 8 What do Porifera look like?
What are 5 characteristics of sponges?
Sponges differ from other animal phyla by their unique possession of 5 distinct features.
- Choanocytes.
- Water canal (aquiferous) system.
- Organic and inorganic skeletons.
- Totipotency. Plasticity.
What are 3 characteristics of sponges?
Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs. Some of them are radially symmetrical, but most are asymmetrical.
What is special about porifera cells?
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 is the description 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 makes a porifera a porifera?
The name porifera means ‘pore bearer’ in Latin (a pore is a tiny hole). A sponge’s body is covered by a skin, one cell thick. This skin has lots of small pores and a few large openings. The small openings are the entrances to a complex system of channels.
Which characteristic is not a feature of the sponges?
In sponges, body is not supported by chitin. Their body is supported by calcareous or siliceous spicules or protein spongin fibres.
What are the unique characteristics of sponges that make them especially suited for medical use?
Sponges are valuable from a scientific point of view because of their unusual cellular organization (the cells do not form tissues or organs such as those found in other animals), their ability to regenerate lost parts, and their biochemical features (they have many compounds not known in other animals).
Why are sponges classified as porifera?
The name porifera means ‘pore bearer’ in Latin (a pore is a tiny hole). A sponge’s body is covered by a skin, one cell thick. This skin has lots of small pores and a few large openings. These collar cells pump water through the entire sponge and filter out food for the sponge cells to eat.
Which of the following is a diagnostic feature of class Demospongia phylum porifera?
Features: (i) Body rounded or flattened without branches. (ii) Presence of tetraxon silicious spicules but the spongin fibres are absent. (iii) In certain forms the spicules may be absent.
What is the characteristics of phylum?
Animals
| Phylum | Meaning | Distinguishing characteristic |
|---|---|---|
| Chaetognatha | Longhair jaw | Chitinous spines either side of head, fins |
| Chordata | With a cord | Hollow dorsal nerve cord, notochord, pharyngeal slits, endostyle, post-anal tail |
| Cnidaria | Stinging nettle | Nematocysts (stinging cells) |
| Ctenophora | Comb bearer | Eight “comb rows” of fused cilia |
What do Porifera look like?
Adult sponges can be asymmetrical or radially symmetrical and come in a variety of sizes, colours, and shapes including tree-like, fan-shaped, cup shaped, tube shaped, ball shaped and shapeless.