GK
BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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because of desiccation and mechanical damage to the tissues
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because no photosynthesis takes place at such low temperature
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because respiration ceases at such low temperature
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because there is no transpiration
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Detailed explanation-1: -Plants are killed in winter by frost as there is desiccation and mechanical damage to the tissues. Desiccation is the state of extreme dryness, or the process of extreme drying.
Detailed explanation-2: -Crop sensitivity and critical temperatures Frost damage to crops results not from cold temperature but mainly from extracellular (i.e. not inside the cells) ice formation inside plant tissue, which draws water out and dehydrates the cells and causes injury to the cells.
Detailed explanation-3: -First, as the days shorten and the cold sets in, many plants become “hardened”. Water is pumped out of plant cells into the roots and any remaining sap, which is a sugary solution, often acts as antifreeze. Broadleaf trees, like maples and oaks, shed their thin, flat leaves each fall to reduce water loss.