Tag: phylum hemichordata
Questions Related to phylum hemichordata
Which of the following is present at the anterior end of Balanoglossus?
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Proboscis
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Collar
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Hepatic region
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Brachiocephalic region
Tongue worm is
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Nereis
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Taenia
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Balanoglossus
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Ancyclostoma
Any wormlike invertebrate of the phylum Pentastomida (or subphylum of Arthropoda), having two pairs of hooks at the sides of the mouth: all are parasitic, some in the respiratory tracts of mammals.
Notochord is absent in the group
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Hemichordata
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Chordata
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Cephalochordata
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Urochordata
Hemichordates are marine invertebrates which are closely related to both chordates and echinoderms. They are deuterostomes which have pharyngeal gill slits and most of them have a dorsal nerve cord and they lack a notochord.
A chordate having both vertebral column and notochord in adult stage is?
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Branchiostoma
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Rattus
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Scoliodon
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Bungarus
Choose the incorrect statement.
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Balanoglossus is a worm like marine animal with external fertilization and indirect development
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Urochordates exhibit retrograde metamorphosis
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Crocodiles have completely divided for chambered heart
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Male Macropus is a mammal exhibiting saltatory locomotion and brood pouch for parental care
Hemichordates are the connecting link between
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Urochordates and cephalochordates
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Cephalochordates and vertebrates
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Urochordates and vertebrates
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Non-chordates and chordates
Hemichordates means half chordates. It is a connecting link between non-chordates and chordates as they share some characteristics of both. The chordates have creatine in their energy cycle for the muscle contaction while non-chordates have arginine but the hemichordates have both i.e., creatine as well as arginine.
Which one of the following is not true for protochordates?
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Presence of dorsal nerve cord
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Tail behind the anal opening
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Presence of gill slits
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Presence of segmented body
The feature that is not a characteristics of protochordata?
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Presence of notochord
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Bilateral symmetry and coelom
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Jointed legs
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Presence of closed circulatory system
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Both C and D
Protochordates are the animals having a dorsal hollow nerve cord, pharyngeal gill slits, and a notochord. They are usually referred to as the oldest chordates. They mainly include tunicates and cephalochordates. They are bilaterally symmetrical and possess a coelom. They do not have a closed circulatory system or jointed legs.
So, the correct answer is 'Both C and D'.
Which of these is not an example of protochordata ?
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Balanoglossus
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Herdemania
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Amphioxus
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Asterias
Asterias ( star fish) is an example of echinodermata and not protochordata as they have a hard calcium carbonate structure that it uses as their skeleton.
Which of the following list contains only hemichordates?
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Earthworm
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Acorn worm
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Hydra
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Liverfluke
Earthworm is an annelid, hydra is a coelenterate, liverfluke is a platyhelminthes, acorn worm (Balanoglossus, Saccoglossus) is a hemichordate belonging to class Enteropneusta.