Sea seuirts and lancelets are inersebrates t complete 45. Which of the following

Question

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

44) option D is th correct form of complete metamorphosis in insect. If partial metamorphosis occurs immature form called nymph is formed. 46) A is correct. Placoid scale is a dermal skin covering of the shark that is hard. It is cartilaginous in nature not bony. 47) B. Birds are endothermic as they require lot of energy to fly which increases their metabolic level. They are warm blooded. 48) B. Mandibles are the mouthparts. Others are incorrect because they have a pair of antenna , unimous appendages, 3 pair of legs. 49) A is correct. Rest all are characteristics of deuterostomes.

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