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作为一般生态规律,越是耐寒的鲜切花越不耐热,越是耐热的鲜切花越不耐寒。

A、对

B、错

相关标签: 鲜切花  

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相关试题

肥料的施用应根据鲜切花生长需要,按一定配比施用氮、磷、钾三种元素,不宜单施一种元素。

A、对

B、错

下列哪项不是我国鲜切花事业存在的问题?()

A、技术水平低,靠天吃饭

B、鲜切花出口混乱

C、缺乏拳头产品

D、种质资源贫乏

(飞机O~l摄氏度机械分级干燥剂埋没干燥法水漫斑温水脱涩法一1~O摄氏度人工分级混果法压花干燥法)

11.填写下列水果和蔬菜的最适贮藏温度:菜花();葡萄()。

12.水果和蔬菜的冷害症状有()、凹陷、不能正常成熟、褐变、腐烂等。

我国目前鲜切花长距离运输主要采用()运输,这样运输速度快,时间较短。花材干燥的常用方法有()、自然风干燥法、()、液剂浸渍法和调节温度与空气压力干燥法。园产品分级可采用()和()。柿子脱涩常用的方法有()、二氧化碳法、()、乙烯脱涩法、乙烯利脱涩法、酒精脱涩法和石灰水脱涩法等。

我省鲜切花的三大生产基地是()。

A.西双版纳

B.大理

C.呈贡

D.中甸

共用题干
Keeping Cut Flowers(鲜切花)
1. While everybody enjoys fresh cut flowers around his/her 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 lon-ger when kept at 12℃than when kept at 26℃.Keeping freshly harvested flowers at the right tem-peratures 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 at-tract 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 color. 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 respi-ration controlled?By controlling temperature .We know that respiration produces heat,but the re-verse(相反的过程)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(漂白剂)can be used in small quantities.It is recommended that 15 drops of chlorine bleach(at 4%solution)be add-ed to each litre of water. The water and solution should also be replaced each day.
Paragraph 2________
A: Control of Respiration
B: Beauty of Fresh Cut Flowers
C: Role of Respiration
D: Most Important Aspect of Flower Care
E: Need for Cleanwater
F:.Ways of Stopping Respiration
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