首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long
Keeping Cut Flowers 1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long
admin
2009-06-15
36
问题
Keeping Cut Flowers
1 While everybody enjoys fresh cut flowers around their house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts.
2 An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations (康乃馨) retain their freshness eight times longer when kept at 12’(2 than when kept at 26’(3. Keeping freshly. harvested flowers at the right temperatures is probably the most important aspect of flower care.
3 Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide (二氧化碳), called respiration (呼吸), generates the energy the flower needs to give the flower its shape and colour. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.
4 How, then, to control the rate at which flowers die? By controlling respiration. How is respiration controlled? By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.
5 Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to "drink" water that is dirty or otherwise polluted. Even when water looks and ’smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach (at 4% solution) be added to each litre of water. The water and solution should also be replaced each day.
选项
答案
D
解析
转载请注明原文地址:https://jikaoti.com/ti/xJNsFFFM
本试题收录于:
职称英语综合类A级题库职称英语分类
0
职称英语综合类A级
职称英语
相关试题推荐
ComputerMouseThebasiccomputermouseisanamazinglycleverinventionwitharelativelysimpledesignthatallowsustop
TheArcticIceisThawingFatherChristmasmayhavetomovehis"workshop"fromtheNorthPolebecauseglobalwarmingistha
Thepriceofvegetablesfluctuatesaccordingtotheweather.
Thatapersoncouldliveinthemodernworldwithoutsyntheticsubstancesisprobablypossible,butwhoevertriedtodoitwould
A.AnUndergroundHomeIsDiscoveredB.SomeBuildingsDoNotRequireNaturalLightC.ADesignerDescribesHisHousesD.Homes
Heshiftedhispositionalittle,inordertoalleviatethepaininhisleg.
ExercisebeinggoodorbadCanexercisebeabadthing?Suddendeathduringorsoonafterstrenuousexertiononthesquashc
RenewableEnergySourcesTodaypetroleumprovidesaround40%oftheworld’senergyneeds,mostlyfuellingautomobiles.Coal
ThanksgivingisnotatrulyAmericantradition.ElizabethenjoysgoingtoworkindowntownNewYork.
Mostofthebutterfliesperishinthefirstfrostsofautumn.
随机试题
简述《老子》的自然主义法律思想。
真正实现人的全面发展的社会条件是()。A.机器大工业B.社会主义制度C.教育与生产劳动相结合D.市场经济
A.2%碳酸氢钠B.1:5000高锰酸钾C.鸡蛋清D.温热水E.生理盐水下列中毒宜用或禁用上述哪种洗胃液强碱中毒患者洗胃宜用
固定义齿的固位形式不包括
以下哪些与甲氨蝶呤相符
下列关于城市规划组织编制主体的表述中,不正确的是()。
下列情形中,承包人不可以提起索赔的事件是()。
生产关系所体现的是生产过程中()。
下列关于Windows2003系统DHCP服务器安装、配置和使用的描述中,错误的是()。
Hedivideduphispropertyandgavea______toeachofhischildren.
最新回复
(
0
)