Question

68) Oxygenated blood reaches heart by

a) Pulmonary artery

b) Pulmonary vein

c) aorta

d) Venacava

69) Which of the following substances is transported by blood plasma?

a) Food

b) Potassium

c) Alcohol

d) All of these

70) How many chambers are present in human heart?

a) One

b) Two

c) Three

d) Four

71) In humans, right auricle receives __________ blood from _________

a) Oxygenated, aorta

b) deoxygenated, venacara

c) Oxygenated, venacara

d) deoxygenated, aorta

72) Veins have valves to

a) prevent back flow of blood

b) prevent the collapse of the vein

c) maintain its position in the body

d) none of these

73) The colour of blood plasma is

a) Red

b) Pale yellow

c) Yellowish green

d) Pink

74) It helps in transportation of food in plants

a) Xylem

b) Palisade cells

c) Root hairs

d) Phloem

75) Where does the maximum exchange of material between blood and surrounding cells occur?

a) Heart

b) Veins

c) Arteries

d) Capillaries

76) The only reptile having 4 chambered heart is

a) Snake

d) Turtle

c) Lizard

d) Crocodile

77) Superior and inferior venacara respectively​

Answer 1

Answer:

68) pulmonary vein

69) pottasium

70)four

71)deoxygenated,aorta

72)

Answer 2

Answer:

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Explanation:

Ans . 68. Pulmonary vein

Ans . 69. All of these

Ans . 70. Four

Ans . 71. Deoxygenated , vena cava

Ans . 72. Prevent back flow of blood

Ans . 73. Yellowish green

Ans . 74. Phloem

Ans . 75. Heart

Ans . 76. Crocodiles

Ans . 77. The superior vena cava carries blood from the arms and head to the right atrium of the heart, while the inferior vena cava carries blood from the legs and abdomen to the heart. The inferior vena cava is retroperitoneal and runs to the right and roughly parallel to the abdominal aorta along the spine