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Besides the basic chordate characters, vertebrates also possess:
The NCERT describes vertebrates: 'Besides the basic chordate characters, vertebrates have a ventral muscular heart with two, three or four chambers, kidneys for excretion and osmoregulation and paired appendages which may be fins or limbs.'
Which of the following characteristics is NOT found in organisms belonging to the class Cyclostomata?
According to the NCERT text, Cyclostomes have a sucking and circular mouth without jaws, and their body is devoid of scales and paired fins. Therefore, the presence of jaws and paired fins is incorrect.
Cyclostomes are characterized by their unique migratory pattern. Which of the following statements accurately describes their migration?
The NCERT states, Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean.
Which of the following pairs represents examples of the class Cyclostomata?
The NCERT book explicitly lists 'Examples: Petromyzon (Lamprey) and Myxine (Hagfish)' under the Class – Cyclostomata section.
All living members of the class Cyclostomata exhibit which of the following feeding behaviors?
The NCERT states, All living members of the class Cyclostomata are ectoparasites on some fishes. This directly answers the question.
Regarding the skeletal structure of Cyclostomata, which of the following is correct?
The NCERT mentions, Cranium and vertebral column are cartilaginous for Cyclostomata.
Which of the following statements about Cyclostomata's circulatory system is accurate?
The NCERT explicitly states, Circulation is of closed type for Cyclostomata.
After spawning, what is the fate of adult Cyclostomes?
The NCERT says, After spawning, within a few days, they die. This clearly describes the fate of adult cyclostomes post-spawning.
Cyclostomata belong to which division within Vertebrata?
The provided diagram and text state, Vertebrata is divided into Agnatha (lacks jaw) and Gnathostomata (bears jaw). Class 1. Cyclostomata falls under Agnatha.
Which of the following is a key distinguishing feature of Cyclostomata that separates them from Chondrichthyes?
Cyclostomata are jawless vertebrates ('without jaws'), whereas Chondrichthyes have jaws ('Their jaws are very powerful'). While both have gill slits, cartilaginous skeletons, and marine habitats (at least predominantly for Chondrichthyes), the presence or absence of jaws is a fundamental differentiator between Agnatha (which includes Cyclostomata) and Gnathostomata (which includes Chondrichthyes).
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