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

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58. Why it is very advantageous to have blood move slowly in the capillaries

Answer: Option C. (It provides time for substances to be exchanged between and tissue fluids)

Explanation: Blood is the major supplier of the oxygen to the various body parts. The oxygenated blood carried by the arteries whereas the deoxygenated blood returns to the lungs by veins. If blood flow in these capillaries is fast then there will be no exchange time for nutrients as well as for gases with tissues and the tissues didn’t get proper oxygen and nutrition. But when the blood flow is slow in these capillaries the tissues get proper exchange time for Oxygen and nutrition so it is always considered advantageous the slow flow of blood in capillaries.

59. What organ controls the production of blood cells?

Answer: Option B (Kidney)

Explanation: Blood cell production is controlled by the hormone named as erythropoietin which is primarily produced by the kidneys. The exact location inside the kidney is not confirmed but it is assumed that it is secreted by renal tubular epithelial cells.

60. In tunicates, pharyngeal gill helps in

Answer: Option D. (respiring and Feeding)

Explanation: These are filter feeding organs found in Invertebrate chordates and hemichordates which are living in aquatic environments. These gill slits have openings from the pharyngeal cavity to the outside which allow water entry from mouth and exit from both sides of the body. The main function of these slits is respiration as well as feeding.

61. Which of the following characteristic is probably most responsible for the incredible diversification of insects on land?

Answer: Option E (Flight)

Explanation: The flying feature of the insects is most responsible for the incredible diversification of insects on land because the insects can walk on the land and they can also have a capability to fly due to which they can move far away from their native place of actual origin and this is the main reason behind their diversification.

62. Which of the following are the only vertebrates in which blood flows directly from respiratory organs to body tissues without first returning to the heart?

Answer: Option B. (fishes)

Explanation: In case of other vertebrates except fish blood flow from respiratory organ to the heart and from there it pumped into the whole body.in case of fish, there is single circuit whereas in other vertebrates has separate pulmonary and systemic circuit.

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