Plants are dried up in winter due to frost because
(1) Evaporation does not take place
(2) Photosynthesis does not take place at such a low temperature
(3) Respiration does not take place at low temperature
(4) There is mechanical loss of tissues and drought condition prevails
Answer: (4) Respiration does not rely on the sun on, so it is possible for plants to respire around the clock. The rate of respiration is dependent on temperature: The warmer it is, the more a plant will respire. Drought, extreme winter or frost and heat injury all create a situation for the plant where moisture is not adequate to maintain the proper water levels in plant tissues. Extreme winter cold and frost are similar to summer drought in that frozen water is unavailable to the plant. The air is very dry as well.
