Sea seuirts and lancelets are inersebrates t complete 45. Which of the following
ID: 3166422 • Letter: S
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Sea seuirts and lancelets are inersebrates t complete 45. Which of the following is a shared derived character of mammals? A) placenta B) amnion C) three middle -ear bones D) endostyle E) notochord. 46. A shark is characterized by A) placoid scales B) bony skeleton C) water vascular system D) amnion E) muscular diaphragsm Which of the following is NOT characteristic of birds? A) hollow bones B) ectothermy C) amnion D) high metabolic rate E) reptilian-like scales on legs 47. 48. Which of the following is characteristic of Insects? A) biramous appendages 8) mandibles C) chelicerae D) eight legs E) two pairs of antennae Protostomes are characterized by A) spiral cleavage 49. B) indeterminate cleavage c) enterocoely D) radial symmetry E) a distinctive body plan that includes a pseudocoelom.Explanation / Answer
Answer 43. The correct option is "All chordates are vertebrates". The characteristic features of the Phylum Chordata are the presence of a notochord and paired pharyngeal gill slits. But in the case of subphylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.
Answer 44. The correct sequence is Egg --> Larva --> Pupa --> Adult.
Answer 45. The correct option is C. Three middle-ear bones.
Answer 46.The correct option is A. Placoid Scales.
Answer 47. The correct option is Ectothermy. Birds are endothermic.
Answer 48. The correct option is Eight legs. Insects have 6 legs.
Answer 49. The correct option is Spiral Cleavage. Protostomes have spiral cleavage opposed to deuterostomes that have radial cleavage.
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