Question

Plants are killed in winter by frost ____________________.

• A. Because of dessication and mechanical damage to the tissue
• B. Because no photosynthesis take place at such a low temperature
• C. Because respiration ceases at such low temperature
• D. Because there is no transpiration

Answer 1

Answer: (A)

Plants are killed in winter by frost because the water present in cells freezes. Due to freezing it expands and causes mechanical damage to the plant tissues. Cell membrane ruptures and metabolic processes of cells are affected due to which the cell dies. The water during transpiration also freezes. Extreme dryness i.e. desiccation occurs due to which plants die.

So, the correct answer is 'Because of desiccation and mechanical damage to the tissue'.