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[originaltext] Sudden cold can be the biggest threat for plants, especially
[originaltext] Sudden cold can be the biggest threat for plants, especially
游客
2023-08-26
22
管理
问题
Sudden cold can be the biggest threat for plants, especially after a warm period. Plants have not had a chance to harden their defenses. Those that are actively growing or flowering are at high risk. Most frost damage takes place at night.[30]Ice crystals form on the leaf surface. They pull moisture from the leaves and keep plant tissues from getting water. Cold weather is most likely to damage or kill plants that do not have enough moisture. So keep the garden watered. Moist soil absorbs more heat than loose, dry soil covered with something like vegetation.
University of Arizona extension experts say covering plants and small trees with cloth or paper can help prevent frost damage. A one-hundred watt light bulb designed for outdoor use can also provide warmth. Some people place Christmas lights on young trees for warmth. The bulbs should hang below the leaves to let the heat rise into the tree. In Florida, as temperatures fell to record lows,[31]the growers of orange trees sprayed water on their trees to help prevent freeze damage. It is explained that as the water freezes, it produces heat, and the ice forms a protective blanket a-round the tree. If you spray a tree, keep the water away from nearby power lines. Heavy ice can form and break them. You can also wrap a tree in palm tree frond leaves, cornstalks or fiberglass. Adding plastic film works well in rain and snow. But experts say plastic alone does not help much.
29. What kind of plants are most susceptible to the effects of sudden cold?
30. What is the main reason for the death of plants in cold weather?
31. According to the speaker, what is an effective way to protect trees from frost damage?
选项
A、They do not have proper temperature.
B、They do not have enough moisture.
C、They are not used to cold weather.
D、They can not get enough sunshine.
答案
B
解析
细节题。文中介绍说,天气寒冷会使植物叶子的表面形成冰晶(Ice crystals),这些冰晶吸收了叶子的水分,并且使植物的组织无法得到水分(keep plant tissues from getting water),寒冷的天气更可能伤害或冻死没有足够水分的植物,由此可知植物在寒冷的天气死亡是由于水分不足,故答案为[B]。
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