For the following quest Choose the ions 42-46, motch the characteriste or descri

Question

For the following quest Choose the ions 42-46, motch the characteriste or description with the group of one best B. Aves (Birds D. Mammalia . Reptlia 42, most members have a cartlaginous endoskeleton 43. ectotherms, amniotic eg resists drying, one earbone skin that hed, or hair, and mammary glands 45. tetrapods, moist skin for gas exchange, metamorphosis i 46 endotherms, adapted for flight, lack teeth some species 47. The lobe-finned fishes appear to have given rise directly to b. reptiles freshwater ray-finned fishes 48. Which sequence represents t the correct order for the emergence of the following derived traits in chordates a, notochord, vertebrae, jaws, amniotic es milk b. jaws, amniotic egg, milk, notochord, vertebrae c. vertebrae, jaws, notochord, amniotic egg, milk d. notochord, vertebrae, jaws, milk, ameniotic ess e,) vertebrae, notochord, jaws, egg, milk 49. With which of the following statements would a biologist be most Humans represent the pinnacle of evolution and have escaped from being affected by natural selection. b. Humans evolved directly from Old World monkeys. c. Humans and apes d. Humans evolved from chimpanzees share a common ancestor S0. As hominins thumand) diverged from other primates, which of the following appeared first? reduced jawbone an enlarged brain the making of stone toolks bipedal locomotion a. b. Page 1 6

Explanation / Answer

42. C- Chondrichthyes is the chordata characterized by presence of cartilage tissue rather than bone tissue in the endoskeleton.

43. E- Ectotherm is an organism whose body temperature control depends on external environment. Amniotic eggs are those containing a amnion. these features along with single earbone and dryness resisting skin are found in reptiles.

44. D- Mammalia is characterised by some egg laying species ,which can be pouched or placental mammals. Hair and mammary glands also are uniquely found in mammals.

45. A- Amphibia have four well developed limbs and are all called as tetrapods. They have a moist skin for breathing activity. For eg. Frog. Amphibians show a radical change in their appearance and behaviour from the larval life to the adult stage which is called as metamorphosis.

46.B- Aves (birds) are endotherms, i.e. they can generate heat internally. Birds also lack any form of teeth and are also adapted for flying.

47. The distinguishing feature of lobe finned fish is the lobe in its fins. The fish has a central appendage in its fins comprising many bones and muscles. They are quite flexible and are capable of supporting body on land as in the case of tetrapods. Thus,  lobe finned fish appears to have given rise to the tetrapods .

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