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

Atmospheric pressure
Osmotic pressure
Root pressure
Capillary pressure

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Physics
In total internal reflection, the light travel from

Rarer to denser medium and it occurs with no loss of intensity
Denser to rarer medium and it occurs with loss of intensity
Rarer to denser medium and it occurs with loss of intensity
Denser to rarer medium and it occurs with no loss of intensity

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals are good conductor of heat
metals have higher thermal capacity than plastics
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals

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