Transpiration and root pressure cause water to rise in plants by: #NTA #NEET #NEETquestion #mcq #2021 #Biology - Study24x7
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Transpiration and root pressure cause water to rise in plants by: #NTA #NEET #NEETquestion

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A

pulling it upward

B

pulling and pushing  it, respectively

C

pushing it upward

D

pushing and pulling it, respectively

NEET / Medical
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  • Dev kumar
    • The transpiration process, pulls water upwards with the help ofcohesion and adhesion properties of water molecules. According to transpiration pull theory, due to transpiration, the water column inside the plant comes under tension. This is called 'transpiration puli'. On account of this tension, the water column is pulled up passively from below to top of the plant (almost like a rope). Root pressure is the pressure that forces water, absorbed from the soil, to move through the roots and up i.e., pushes it up) the stem of a plant. Likewise, if you had a very narrow straw, less suction would be required. This correlation occurs as a result of the cohesive nature of water along the sides of the straw (the sides of the xylem). Because of the narrow diameter of the xylem tubing, the degree of water tension, (vacuum) required to drive water up through the xylem can be easily attained through normal transpiration rates that often occur in leaves.

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