首页
登录
职称英语
An Essential Scientific Process All l
An Essential Scientific Process All l
练习题库
2022-08-02
139
问题
An Essential Scientific ProcessAll life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet. 词汇:nutrient n.营养物 ganism n.生物体,有机体carbon dioxide n.二氧化碳chloplast n.叶绿体molecule n.分子vap n.水蒸气oxygen n.氧气 photosynthesis n.光合作用chlophyll n.叶绿素glucose n.葡萄糖cease v.停止 注释:1.Then animals feed upon the plants.动物以植物为食。 练习:3.In the title, the term Essential Scientific Process refers toA.photosynthesis.B.the fmation of glucose.C.global warming.D.water getting to the roots of plants.
选项
答案
A
解析
3.A 文章通篇都在讲Photosynthesis,即光合作頌钠作用和重要性,文章结尾又重申了Photosynthesis is essential f life on our planet,因此选A项。B项是光合作用的一个部分,C、D项则毫不相干。
转载请注明原文地址:https://tihaiku.com/zcyy/1494834.html
本试题收录于:
理工C题库理工类分类
理工C
理工类
相关试题推荐
Intheprocess,thelightenergyconverts
Inpreparingscientificreportsoflabor
A.bodyB.demonstrationC.processionD
共用题干 StarsinTheirEyesTheScientific
共用题干 StarsinTheirEyesTheScientific
共用题干 第三篇ScientificAttitudeWeallknow
共用题干 第三篇ScientificAttitudeWeallknow
Intheprocess,thelightenergyconverts
共用题干 Stars1nTheirEyesTheScientific
共用题干 Stars1nTheirEyesTheScientific
随机试题
Australia,thelast【B1】______tobe"discovered",wassightedbyDutch,Portu
[originaltext]M:WhatarelationshipStevenandhisfatherhave!W:Don’tthey
颈椎前后位标准影像显示,以下错误的是A.第3~7颈椎及第1胸椎显示于照片正中
卧床、无发热或异常消耗的成年男性患者每天最低热卡需要A.15~20kcal/kg
关于粒细胞发育阶段的叙述,错误的是()。A.分裂池包括原粒细胞、早幼粒细胞,具
外科急腹症病人未明确诊断前护理中强调的四禁不包括A:禁食 B:禁止活动 C:
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性:
根据《建筑地基基础设计规范》(GB50007—2002),对季节性冻土设计
Itissaidthathe( )forseveralyears.
某感潮河段深水航道整治工程,其主要施工内容为建造顺岸护滩潜堤,潜堤结构形式为抛石
最新回复
(
0
)