Classification of plants is mainly based on reproductive characteristics. Classification by tissue structure plants are classified into non-vascular this is mosses and vascular plants this includes all others.
Get Full Essay Get access to this section to get all help you need with your essay and educational issues. Tunicates or Urochordata are all marine and colonial or solitary.
Some species lead a sedentary life and others are pelagic.
The Ascidian tunicate has formed a wrinkled cylinder or sac with inches in length and has a broader base by which the organism is attached to the rocks or other substrates.
Large aperture is present at the free end that is more or less terminal position which is the mouth or the inhalant siphon. Atrial or exhalent aperture is present little behind the aperture.
Water current flows into the organism by the mouth and passes out through the atrial aperture. Disturbing of the animal makes it to squirts out jets of water through the atrial aperture and this gave the organism the Details of urochordata essay sea squirt.
Anterior end of the animal is made by the oral aperture and posterior end is attached to the substrates and in the dorsal position the atrial aperture is placed. The body of the animal is enclosed into a tough tunicine, a substance made of cellulose.
The underlying ectoderm of the body wall secretes the test as cuticle but the mesoderm cells invade and give rise to the connective tissue.
Test is attached in the region of the mouth and artial aperture where the blood vessels enter, others regions of the body wall are not attached and hence a loose covering is formed.
The body wall of the animal is called as the mantle which is underlying below the tunic. Mantle consists of a matrix of connective tissue, blood vessels, muscles and nerves are found upon the ectoderm. Mouth and atrial apertures was the region attached to the tunic and produced into short prolongations called as the oral and artial siphons.
The Acrania is divided into three subphyla: Hemichordata, Urochordata and Cephalochordata, chiefly on the character of notochord present. Subphylum I. Hemichordata (Gr. hemi, half; chorde, cord). Body divided into 3 regions: Proboscis, collar and trunk. Notochord doubtful, short, confined to proboscis and non–homologous with that of chordates. They are in major subphyla: Subphylum Cephalochordata (lancelets), Subphylum Urochordata (tunicates), and Subphylum Vertebrata (vertebrates) (Barnes, ). Vertebrates: Subphylum Vertebrata They have a cranium (skull) and spinal column with segmented vertebrae, skeleton with cartilage or calcareous bones. Essay Structure Writing an academic essay means fashioning a coherent set of ideas into an argument. Because essays are essentially linear—they offer one idea at a time—they must present their ideas in the order that makes most sense to a reader.
Sphincter muscles help in closing the apertures. Mouth leads to the short stomodaeum that is formed by the infolding of the ectoderm. Stomodaeum is followed by the pharynx which occupies the major part of the body from mouth to base. These regions are covered by the atrial or peribranchial cavity and all these parts are enclosed by the mantle.
Long the mid ventral line the pharynx is attached to the mantle and free at the dorsal and lateral parts. Atrial aperture is an exterior opening for the atrial cavity. Pharynx is a food collecting apparatus and the animal feeds on small organisms which come into the mouth along the water current.
The pharynx is perforated by numerous gill silts or stigmata and the lining of pharynx and edges of the stigmata are ciliated. There is a ciliated groove in the inner median line called as the endostyle. Respiration takes place by the passing of water through the stigma.
The transverse and vertical region of the pharyngeal region contains blood vessels.i'm a chordata! urochordata!
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Nov 07, · Traditional metazoan phylogeny classifies the Vertebrata as a subphylum of the phylum Chordata, together with two other subphyla, the Urochordata (Tunicata) and the Cephalochordata.
The Chordata, together with the phyla Echinodermata and Hemichordata, comprise a major . Definition of Urochordata in the caninariojana.com Dictionary.
Meaning of Urochordata. What does Urochordata mean? Proper usage of the word Urochordata.
Information about Urochordata in the caninariojana.com dictionary, synonyms and antonyms. Urochordata –Tunicates a.
Molgula – preserved. i. What is the function of the two knobs/protrusions? At caninariojana.com you will find a wide variety of top-notch essay and term paper samples on any possible topics absolutely for free.
Want to add some juice to your work? No problem! Here you will also find the best quotations, synonyms. They are in major subphyla: Subphylum Cephalochordata (lancelets), Subphylum Urochordata (tunicates), and Subphylum Vertebrata (vertebrates) (Barnes, ).
Vertebrates: Subphylum Vertebrata They have a cranium (skull) and spinal column with segmented vertebrae, skeleton with cartilage or calcareous bones. Structural details: Vertebrates have a well-formed head, a distinct brain protected by a skull, aswell as sense organs.
They also have a highly efficient respiratory system, a muscular pharynx with slits and gills (in terrestrial vertebrates the slits and gills are greatly modified), a burly gut, and a chambered heart.