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Which of the following is a fundamental characteristic shared by both Chondrichthyes and Osteichthyes?
The NCERT states, 'Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces.' This highlights the common characteristic of fins for locomotion between these two classes.
In vertebrates, the notochord present during the embryonic period is replaced by what structure in the adult?
The NCERT text specifies, 'The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult.'
Chordates, including Osteichthyes, typically possess which type of embryonic development structure that gives rise to the central nervous system?
The characteristic features of chordates include a 'dorsal, hollow nerve cord.' This is a defining feature of the phylum Chordata, to which Osteichthyes belong.
Osteichthyes, as vertebrates, typically exhibit a circulatory system that is:
The NCERT text states that chordates possess a 'closed circulatory system' and vertebrates specifically 'have a ventral muscular heart with two, three or four chambers.' This indicates a closed circulatory system with a heart.
The presence of jaws is a characteristic that broadly divides Gnathostomata from which other group of vertebrates mentioned in the context?
The NCERT states, 'Some of the vertebrates do not possess jaws (Agnatha) whereas most of them possess jaws (Gnathostomata). Agnatha is represented by the class, Cyclostomata.' This clearly indicates that Cyclostomata are jawless vertebrates, contrasting with Gnathostomata (jawed vertebrates).
Organ-system level of organization is characteristic of which of the following groups, including Osteichthyes?
The NCERT mentions that Chordata (to which Osteichthyes belong) are 'coelomate with organ-system level of organisation.' Earlier in the text, it notes that 'organ level is exhibited by members of Platyhelminthes and other higher phyla,' confirming higher phyla including chordates have this level.
All vertebrates are chordates, but not all chordates are vertebrates. This is primarily because:
The NCERT states, 'The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Thus all vertebrates are chordates but all chordates are not vertebrates.' This replacement of the notochord with a vertebral column is the key distinguishing factor making vertebrates a subset of chordates.
Which of the following features found in Osteichthyes is also a fundamental characteristic of all Chordata?
Figure 4.16 and the accompanying text list 'paired pharyngeal gill slits' as a characteristic of Chordata. While Osteichthyes have bony endoskeletons, fins, and two-chambered hearts, these are specific to certain vertebrate classes or subclasses, not universal to all Chordata.
The body symmetry observed in Osteichthyes is typically:
The NCERT states that Chordata (including Osteichthyes) are 'bilaterally symmetrical'. This is a fundamental feature of the phylum.
Which of the following terms correctly describes the germ layer organization of Osteichthyes?
The NCERT describes Chordata (which includes Osteichthyes) as 'triploblastic'. This means they develop from three germ layers: ectoderm, mesoderm, and endoderm.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.