1. Why do veins have valves but not the arteries?
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What makes water to rise in tall trees which are several metres high?
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Pata nahi
..__________..
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1) In artery blood travels due to pressure so there is no need of valves but in veins the blood flows from farthest points in the body against gravity so to prevent the back flow of blood valves are present
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Due to transpiration pull or suction force
As water is lost by the plant due to adhesion of the water molecules it pulls more water which is called transpiration pull it makes water rise metres in tall tree
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