What is the symmetry of Obelia?
Hint:-Obelia is radially symmetrical. It belongs to the phylum cnidaria (Coelenterata). They are aquatic, mostly marine, sessile, and radially symmetrical animals.
What are the characteristics of Obelia?
Through its life cycle, Obelia take two forms: polyp and medusa. They are diploblastic, with two true tissue layers—an epidermis (ectodermis) and a gastrodermis (endodermis)—with a jelly-like mesoglea filling the area between the two true tissue layers. They carry a nerve net with no brain or ganglia.
Is Obelia dioecious?
Obelia is dioecious as each medusa has reproductive organs of only one sex. There is no difference between the male and female medusae. The gonads (testis or ovaries) are four in number and lie on the sub-umbrella, below the radial canals, in the form of knobs.
Why is Obelia Trimorphic?
It is called trimorphic because it has 3 stages in its life and these are polyp medusa and blastostyle.
How is Obelia Trimorphic?
In fact, to start with Obelia is a monomorphic form having polyp only but later due to the development of blastostyle it becomes a dimorphic colony and finally medusae bud over the blastostyle in a mature colony, then it becomes a trimorphic colony.
What is Obelia colony?
Obelia colony is a mesh of highly branched structure where horizontal hydrorhiza is attached to the substratum and has the vertical branches or hydrocauli (about 2.5 cm in length) that bear zooids. Both hydrocaulus and hydrorhiza are hollow tubes.
What is the classification of Obelia?
Obelia
Obelia/Scientific names
What is the kingdom of Obelia?
Animal
Obelia/Kingdom
Is Obelia a sponge?
Stereogastrula also known as Parenchymula larva belongs to organisms of the phylum Porifera composed of sponges. Obelia belongs to the phylum Cnidaria.
Is Obelia colony is Trimorphic?
Obelia colony consists of a horizontally branching root-like stolon or hydrorhiza from which emerge many vertical branching stems called hydrocaulus. Thus, Obelia colony is trimorphic, exhibiting two types of zooids attached to the sedentary colony and a free swimming zooid or medusa.
What is polyp and medusa?
There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.
How many points are correct about Obelia?
| Question | (i) Radial symmetrical (ii) Diploblastic (iii) The cellular level of organization (iv) Digestion is intracellular only (v) Exhibit two basic body forms called polyp and medusa. How many points are correct about Obelia? |
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What kind of structure does an Obelia have?
Obelia Colony – A Gross Structure: Each colony of Obelia consists of a horizontal thread-like root called hydrorhiza which is attached to a weed or any substratum. From hydrorhiza arises a vertical branching stem about 2.5 cm long which is known as a hydrocaulus. The hydrorhiza and hydrocaulus are hollow tubes.
What does the Obelia on a seaweed look like?
Introduction to Obelia: Obelia is a typical example of a marine, colonial hydrozoan. Like most hydrozoans it has both polyp and medusa stages. Obelia occurs as a delicate whitish or light brown, almost fur-like growth on seaweeds or timber. It consists of branched filaments approximately the thickness of fine sewing cotton.
What kind of organism is the Obelia longissima?
Obelia geniculata. Obelia longissima. Obelia bidentata. Obelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine) organisms that are relatively simple in structure.
What kind of animal is an Obelia fish?
Obelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal species that have both polyp and medusa stages in their life cycle. Hydrozoa belongs to the phylum Cnidaria, which are aquatic (mainly marine) organisms that are relatively simple in structure.. Obelia is also called sea fur.