玫瑰象征爱情，虽然只是蔷薇属的一个种，一年只开一次花，但是是世界上重要的鲜切花。
A、对
B、错

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情人节（2月14日），美国销售的鲜切玫瑰花多来自哥伦比亚。读下图回答下列问题。小题1:.与美国相比，在情人节期间，哥伦比亚生产鲜切花的优势自然条件是　（）
A．气温较高
B．降水较丰沛
C．地势较平
D．土壤较肥沃小题2:.美国的农业生产实现了地区生产的专业化，形成了一些农业带（区），图中①处是　（）
A．小麦区
B．乳畜带
C．玉米带
D．棉花带

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园林植物在生长发育的过程中，或在种苗.球根.鲜切花和成株的贮藏及运输中，由于遭受其他病原生物的侵害，或不适宜的环境条件的影响致使园林植物在生理上.组织上.形态上发生一系列的病理变化，生长发育不正常，导致花木的产量和质量降低，甚至导致植物局部或全株死亡，造成经济损失，严重影响了观赏价值和园林景色，这种现象称为（）。
A.园林植物药害
B.园林植物病害
C.园林植物草害
D.园林植物虫害

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水分是鲜切花植物生存的重要条件，在鲜切花栽培中无论什么鲜切花都一样浇水才能长得旺盛。
A、对
B、错

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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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关于组织培养，描述正确的有（）
A、繁殖系数较低，切面较大，易感染病毒病等病害
B、主要用于大量生产无病毒商品花卉，尤其是观叶植物和鲜切花
C、繁殖速度快，繁殖系数大，繁殖方式多，适用的品种多
D、其寿命的长短除与遗传特性和发育是否健壮有关外，还受环境因素的影响

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玫瑰象征爱情，虽然只是蔷薇属的一个种，一年只开一次花，但是是世界上重要的鲜切花。
A、对
B、错

相关专题：鲜切花

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最新解决用户提交的题

玫瑰象征爱情，虽然只是蔷薇属的一个种，一年只开一次花，但是是世界上重要的鲜切花。A、对B、错

相关专题： 鲜切花

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最新解决用户提交的题

玫瑰象征爱情，虽然只是蔷薇属的一个种，一年只开一次花，但是是世界上重要的鲜切花。
A、对
B、错

相关专题：鲜切花