Physics
Water from soil enters into the root hairs owing to :

Root pressure
Capillary pressure
Atmospheric pressure
Osmotic pressure

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is-deeper than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water
The sea is wider than the river

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