Directions: In the following questions, a statement of assertion (A) is followed by a statement of the reason (R). Mark the correct choice as:
(a) Both assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and Reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
Assertion (A): Valves are present in the arteries.
Reason (R): Arteries carry oxygenated blood from the heart to different body parts except for the pulmonary artery.
Solution
d
Valves are absent in arteries, whereas it is present in veins, which prevent the backflow of blood. The blood flowing through the vein has low pressure so to keep it moving in the forward direction, valves the present.
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