What are the three functions of the gastrovascular cavity?
The gastrovascular cavity is a structure found in primitive animal phyla. It is responsible for both the digestion of food and the transport of nutrients throughout the body. The cavity has only one opening to the environment. Food goes in and waste comes out that same opening, making it a two-way digestive tract.
What are five characteristics of cnidarians?
The five main characteristics of cnidarians are:
- Radial symmetry.
- Diploblastic animals.
- Tissue level of organisation.
- Presence of cnidoblasts with stinging nematocysts on the tentacles.
- Polymorphism and have two body forms, i.e. polyp and medusa.
Is gastrovascular cavity a characteristic of cnidarians?
The gastrovascular cavity is the primary organ of digestion and circulation in two major animal phyla: the Coelenterates or cnidarians (including jellyfish and corals) and Platyhelminthes (flatworms). The cavity may be extensively branched into a system of canals.
What are the characteristics of Poriferans?
Characteristics of Phylum Porifera
- The 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.
What is the advantage of a gastrovascular cavity?
What is the advantage of a gastrovascular cavity that ramifies throughout the body? Higher surface area for the distribution/absorption of nutrients.
What characteristic increases the surface area of the gastrovascular cavity of a sea anemone?
Septa. Septa increase the surface area for digestion.
What are major characteristics of cnidarians?
All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea. Most Cnidarians have radial symmetry.
What are examples of Poriferans?
Glass spongesDemospon…Calcareous spongeVenus’ flower basketStromatop…Heteractini…
Sponge/Lower classifications
Which of the following is a characteristic associated only with cnidarians?
Which of the following is a characteristic associated only with cnidarians? cnidocytes specialized for defense and capturing prey.
Does gastrovascular cavity have one opening?
Gastrovascular cavities, as shown in Figure 15.5 a, are typically a blind tube or cavity with only one opening, the “mouth”, which also serves as an “anus”. Ingested material enters the mouth and passes through a hollow, tubular cavity. Cells within the cavity secrete digestive enzymes that break down the food.
What characteristics account for the great success of cnidarians?
What Characteristics Account for the Great Success of Cnidarians…
- Two distinct adult forms.
- Diphasic life cycle in some species.
- Ability to proliferate by cloning.
- And to form polymorphic colonies.
- Formidable prey capture device.
- Low Energy Demands.
What are the five characteristics of a sponge?
General Characteristics of Sponges:
- Habitat: ADVERTISEMENTS:
- Body Form: Their body is porous, viz., provided with pores.
- Symmetry: Most of the sponges are asymmetrical.
- Germ Layers:
- Level of Organization:
- Body wall:
- Canal System:
- Skeleton (Fig.
What are the main characteristics of sponge?
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.
What unique characteristics can you give about the organs of the digestive system of ruminants?
The main distinction in a cow’s digestive system, or a ruminant digestive system is that the stomach has four separate compartments, each with a unique function, whereas most other animals only have a single compartment with a unified functionality.
Which of the following are the characteristic features of Cnidaria?
Cnidarians share several basic characteristics. All Cnidaria are aquatic, mostly marine, organisms. They all have tentacles with stinging cells called nematocysts that they use to capture food. Cnidarians only have two body layers, the ectoderm and endoderm, separated by a jelly-like layer called the mesoglea.