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Q.

Assuming the xylem tissues through which water rises from root to the branches in a tree to be of uniform cross section find the maximum radius of xylem tube in a 10 m high coconut tree so that water can rise to the top. (surface tension of water = 0.1 N/m, Angle of contact of water with xylem tube = 60°)

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a

1 mm

b

1 μm

c

10 μm

d

1 cm

answer is D.

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Detailed Solution

ρhgπr2 = 2πrScosθ

⇒ r = 2S cos θρgh = 2×0.1×0.5103×10×10 = 10-6 m

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