s8. Why is it very advantageous to have blood move slowly in the capliaries? A)

Question

s8. Why is it very advantageous to have blood move slowly in the capliaries? A) it will not cause damage to the valves itmaintans the high pressure in the capll-res. C). it provides time for substances to be exchanged between blood and issue D). it creates a greater osmotie pressure for cels E Al of the above 9 What organ controls the production of blood cells? A). heart B kidney C) bone marrow E). spleen. 60. in turnicates, pharyngeal gill helps in A). respiring. B) feeding. C. moving D) respiring and feeding E) excretion. Which of the following characteristic is probably most responsible for the incredible diversification of insects on land? 61. AL segmentation B) antennae. C) tracheal systemm. D). bilateral symmetry. E) flight 62. Which of the following are the only vertebrates in which blood flows directly from the respiratory organs to body tissues without first returning to the heart? B). Fishes C). Mammals. D. Reptiles. E). Birds

Explanation / Answer

58. The substances such as nutrients and gases are exchanged through diffusion during blood flow. The flow of blood in capillaries is slow because providing sufficient time to allow the exchange of gases and nutrients. option C is correct.

59. primary site of blood cells formation is bonemarrow. The production of blood cells depend on sufficinet production of erythropoietin hormone by kidneys. Erythropoietin is produced by peritubular capillary cells of kidneys. Though blood cells are formed in bonemarrow, the amount of erythropoietin produced by kidneys regulate the formation of blood cells. Other organs like lymphnodes, spleen and liver influence the production, destruction, and differentiation of blood cells. Option B is correct.

60. Tunicates are sea squirts. These are organisms belong to Urochordata and are also known as Ascidians. These organisms are vertebrates that have notochord and pharyngeal gills. The adult organisms do not have a vertebral column. These organisms are filter feeders. Pharyngeal gills are located in pharynx and filter the water entering through pharynx and consume tiny orgaanisms present in water currents. Option B is correct.

61. Insects are diverse group of organisms on land. The insects have various special features like exoskeleton, open circulatoru system, mouth parts, wings, trachea and metamorphosis. The insects do not have lungs, the tracheal tubes are filled with air and supply to all parts and enable them to be light to achieve flight. Option C is correct.

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