Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.

ANSWER DOWNLOAD EXAMIANS APP

Physics
Plants are dried up in winter due to frost because

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

ANSWER DOWNLOAD EXAMIANS APP