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What is the phone number of the Uttarakhnad Open University?
Who is the Programme Coordinator of the Department of Zoology and Biotechnology at Uttarakhand Open University?
What is the title of the course being described?
Where is Dr. H.C. Tiwari affiliated with?
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Who is the Unit Writer of Units 1-8?
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What is the email address of the Uttarakhnad Open University?
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What is the shape of the alimentary canal of the larva of Cephalodiscus?
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What is the characteristic of Graptalita?
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What is the habitat of Balanoglossus?
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What is the shape of the anterior opening of the burrow of Clavigerus?
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What is the significance of Balanoglossus in zoology?
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What is the term for the larva related to tornaria larva?
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What is the number of lips that guard the aperture of siphons in Herdmania?
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In which organ do megaloscleres not occur in Herdmania?
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What is the shape of the intestine in Herdmania?
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What is the site of respiration in urochordates?
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What is the common name of Herdmania?
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What is the reason why a living organism requires food?
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What is the main characteristic that distinguishes cephalochordates from vertebrates?
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What is the name of the subphylum that includes lancelets, and what does it mean?
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What is the importance of lancelets in Asia?
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How many species of cephalochordates are there, approximately?
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What is the role of cephalochordates in food chains?
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What is the common name used to refer to all cephalochordates?
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What is the function of the oral cirri in Amphioxus?
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What is the purpose of the mucus film produced in the endostyle?
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What is the term for the structure connected to the endostyle?
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How do adults clear their mouth or throat of debris?
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What is the function of the atrium surrounding the pharynx?
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What is the path of food through the digestive system of Amphioxus?
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Study Notes
Chordata - Introduction
- Uttaranchal Open University's BSc Zoology course includes a unit on Chordata, which is divided into 10 units
- The course has a team of experts, including Prof. B.D. Joshi, Dr. H.C. Bisht, and Dr. Shyam S. Kunjwal, among others
Cephalodiscus and Planctosphairoidea
- Cephalodiscus is a class of Hemichordata with U-shaped alimentary canal in larvae
- Planctosphairoidea is another class of Hemichordata, known only by a round transparent pelagic larva related to tornaria larva
Graptalita
- Graptalita is a fossil class of Hemichordata
- They are extinct, colonial hemichordates with tubular chitinous skeleton and colonial habits, showing an affinity with Rhobdopleura
Type Study and Affinity - Balanoglossus (Tongue Worm)
- Balanoglossus is a marine, tubicolous or burrowing hemichordate, inhabiting shallow coastal waters of intertidal zone
- It has a U-shaped tube or burrow with two vertical limbs, with the anterior opening being funnel-shaped and the posterior end being rounded and concealed below the spirally coiled faecal matter
- Balanoglossus is an ocean-dwelling acorn worm (Enteropneusta) genus, with great zoological interest due to its evolutionary link between invertebrates and vertebrates
Herdmania - General Study
- Herdmania is a genus of Urochordata, with Megascleres occurring throughout the body, except in the heart
- The aperture of siphons in Herdmania is guarded by 1 lip
- True coelom in Herdmania is greatly reduced due to the development of the atrium
- Intestine in Herdmania is U-shaped
- Respiration in Urochordates occurs through the test and gill slits
Cephalochordata - Introduction
- Cephalochordata is a subphylum of Chordata, characterized by the presence of a notochord that extends into the head
- Lancelets are blade-shaped, yielding the name amphioxus, which comes from the Greek for "both (ends) pointed"
- Cephalochordates play a key role in food chains and are harvested commercially for food in Asia
- There are only two genera of cephalochordates recognized: Branchiostoma (about 23 species) and Asymmetron (about six species)
Cephalochordata - Digestive System
- Amphioxus has oral cirri, which are thin tentacle-like strands that hang in front of the mouth and act as sensory devices and filters for the water passing into the body
- Water passes from the mouth into the large pharynx, which is lined by numerous gill-slits
- The ventral surface of the pharynx contains a groove called the endostyle, which is connected to Hatschek's pit and produces a film of mucus
- The mucus traps suspended food particles and is collected in a second, dorsal, groove, and passed back to the rest of the digestive tract
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Description
Test your knowledge of Chordata, a group of animals that includes vertebrates, in this zoology quiz. Questions cover the characteristics, classification, and diversity of Chordata. Prepare for your B.Sc. II year exam with this practice quiz.
