Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Boiling point of water decreases
Boiling point of water increases
Latent heat of vaporization of water decreases
Latent heat of vaporization of water increases

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Physics
Plants are dried up in winter due to frost because

Photosynthesis does not take place at such low temperature
There is mechanical loss of tissues and drought condition prevails
Evaporation does not take place
Respiration does not take place at low temperature

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