What are the main characteristic features found in Poriferan animals?
What are the characteristics of phylum Porifera?
- These are pore-bearing multicellular animals.
- The body has no organs.
- They exhibit holozoic nutrition.
- The body is radially symmetrical.
- They can regenerate their lost parts.
What are 2 body layers of sponges?
The outer layer of the sponge is the epidermis which is made of flat cells called epithelial cells. Color all the epithelial cells (B) of the epidermis pink. The inner layer, or gastrodermis, consists of choanocytes or collar cells (A) whose function is to circulate water through the sponge.
What is the description of poriferans?
The phylum Porifera comprises the sponges. Sponges are simple invertebrate animals that live in aquatic habitats. Although the majority of sponges are marine, some species live in freshwater lakes and streams. They are found in shallow ocean environments to depths as great as five kilometers (km).
What are the 4 main types of cells found in sponges?
Although sponges do not have organized tissue, they depend on specialized cells, such as choanocytes, porocytes, amoebocytes, and pinacocytes, for specialized functions within their bodies.
Which one of the following is not a Poriferan?
Detailed Solution. Adamsia is not an example of Porifera. Porifera are the animals that are generally marines and mostly asymmetrical animals. Adamsia belongs to the phylum Coelenterata which are marine free living animals with symmetrical body structure.
What is the structure of a sponge?
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. The channels lead to inner chambers lined with specialized feeding cells called choanocytes or collar cells.
What are the 3 types of cells found in sponges?
Three principal types of cells may be distinguished—choanocytes, archaeocytes, and pinacocytes–collencytes.
What is the significance of the epithelial cells in Poriferan circulation?
Water is pulled into the sponge via internal choanocyte cells, which take in water through the sponge’s outer pores. The choanocytes line the inner spongocoel, or body cavity. And, using their specialized epithelial cells, sponges can absorb and excrete gases and nutrients in a very simple, but effective, body plan.
What is the classification of Porifera?
Integrated Taxonomic Information System – Report
| Phylum | Porifera Grant, 1836 – sponges, éponges, esponja, porifero |
| Direct Children: | |
| Class | Calcarea Bowerbank, 1864 |
| Class | Demospongiae Sollas, 1885 |
| Class | Hexactinellida Schmidt, 1870 |
What is the structure of the sponge?
What are the components of sponges?
The essential elements of the water-current system include the pores, or ostia, through which water enters the sponge (incurrent system); the choanocytes, or collar cells, which are flagellated cells that generate water currents and capture food; and the oscula, openings through which water is expelled (excurrent …
What are general characteristics of sponges?
Simple sponges are hollow cylinders with a large opening at the top through which water and wastes are expelled. A thin, perforated outer epidermal layer covers a porous skeleton, which is composed of interlocking spicules of calcium carbonate, silica, or spongin (found in 80% of all sponges), a proteinaceous material.
Which animal is known as bath sponge?
Spongia officinalis, better known as a variety of bath sponge, is a commercially used sea sponge….
| Spongia officinalis | |
|---|---|
| Genus: | Spongia |
| Species: | S. officinalis |
| Binomial name | |
| Spongia officinalis Linnaeus, 1759 |
What are the main characteristics of phylum Coelenterata?
What are the characteristics of Coelenterates? The Coelenterates are aquatic, mostly marine organisms. The body is radially symmetrical and exhibit a tissue-level organization. Their mouth is surrounded by sensory tentacles, which helps to capture their prey.
What is the skeleton of a sponge made of?
Sponge skeletons are made of rod-like silica structures called spicules that are cemented to rocks and to each other with collagen.
What are the structural cells of sponge?
Specialised Cells: Sponges have special collar cells (or choanocytes) that are unique in the animal kingdom. They have flagella, whip-like structures that work to set up water currents so the sponge can sieve food particles from the water.
Which structures are found on sponges?
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.
What are porocytes and their functions?
structure of sponge In sponge: Pinacocytes, collencytes, and other cell types. …contains flattened granular cells called porocytes because they contain the pores needed to allow water into the sponge. The porocytes can contract, thus closing the pores during unfavourable environmental conditions.