Question

29. All of the following are characteristics of insects EXCEPT: a. closed circulatory system b. jointed appendages c. exoskeleton d. specialized segmentation 30. Which of the following chordates is NOT a vertebrate? a. lampreys b. sharks c. hagfishes d. lancelets 31. Mammals that carry their young in a pouch for an extended period of time are the: a. marsupials b. monotremes c. placental mammals d. primates 32. In contrast to amphibian eggs, reptile eggs: a. lack an external covering b. have leathery shells c. have hard shells d. lack amniotic membranes 33. Arthropods have evolved body segmentation which is very important from an evolutionary standpoint because it provides the opportunity for: a. development of separate respiratory and circulatory systems b. development of a separate excretory system and reproductive tract c. development of a more complex nervous system d. specialization of body regions 34. Vertebrates are distinguished from other chordates by having: a. a notochord b. a vertebral column c. gill slits d. a closed circulatory system 35. The age structure pyramid for rapidly growing populations: a. is in the form of a pyramid b. is characterized by a large percentage of the population in the post-reproductive years c. has a very broad base d. involves both a and c e. involves both b and c 36. All of the populations of different species that occupy and are adapted to a given area are referred to by which term? a. community b. ecosystem c. niche d. biosphere 37. Decomposers: a. are able to enter a food chain at any trophic level b. are the most numerous organisms in an ecosystem c. include bacteria and fungi d. are all of the above

Answer 1

29. Insects contain an open circulatory system. Hence the correct answer is: a. closed circulatory system.

30. Lancelet is an invertebrate. Hence the correct answer is: d. Lancelet.

31. Marsupials are the organisms that give birth to underdeveloped young ones and hence carry them around with them. Hence the correct answer is: a. Marsupials.

32. Reptilian eggs have a hard shell when compared to the amphibian eggs. Hence the correct answer is: c. have a hard shell.

33. The segementation in the body of arthropods led to the division of the body parts into head, thorax and abdomen. Hence the correct answer is: d. Specialisation of body regions.

34. The name vertebrate came due to the evolution of the vertebral column. Hence the correct answer is: b. vertebral column.

35. The age structure for rapidly growing population will be having a large base with a very small population in the post reproductive stage which gives the appearance of a pyramid. Hence the correct answer is: d. involves both a and c.

36. Niche defines the home of several species in which they live and coexist. Hence the correct answer is: c. niche.

37. Decomposers can degrade consumer, producer or any trophic level organism once they die. They maybe bacteria or fungi and are the most numerous species in the ecosystem. Hence the correct answer is: d. all of the above.

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