SCIENCE
PLANT KINGDOM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Because of dessication 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: -there is desiccation and mechanical damage of tissue. there is no transpiration at such a low temperature.
Detailed explanation-3: -Black frost or ("killing frost") is not strictly speaking frost at all, because it is the condition seen in crops when the humidity is too low for frost to form, but the temperature falls so low that plant tissues freeze and die, becoming blackened, hence the term “black frost".
Detailed explanation-4: -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-5: -For plants, dormancy declares when to prepare their soft tissues for freezing temperatures, dry weather, or water and nutrient shortage. Instead of exerting energy in an attempt to grow, they know to stop growing and conserve energy until mild weather returns.