Physics
In the gamma decay of a nucleus

Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes
The mass number of the nucleus changes whereas its atomic number does not change
Both the mass number and the atomic number of the nucleus change

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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

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