下载App
搜答案
所有课程
登录
注册
千题库
职称英语
理工类
理工C
《An Essential Scientific Process》
《An Essential Scientific Process》
题量:5题
题型:单选题
试卷简介: 《An Essential Scientific Process》, 此试卷为参加"理工C"的考生提供的"《An Essential Scientific Process》"的答案和解析。
开始做题
下载试卷
App做题
试题预览
1
单选题
1.00分
An Essential Scientific Process
All 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:
1.In the first paragraph,the wd “excess” means
A.
heavy
B.
extra
C.
green
D.
liquid
点击查看答案
百度扫一扫练题
关注千题库公众号
理工C-题库
千题库下载
历年真题
历年考试真题试卷, 真实检验
章节练习
按章节做题, 系统练习不遗漏
考前押题
考前押题, 提高分数
模拟试题
海量考试试卷及答案, 分数评估
进入题库
相关试卷
2022年《理工C》模拟卷2
2022年《理工C》模拟卷3
2022年《理工C》模拟卷1
2022年《理工C》模拟卷4
2022年《理工C》模拟卷5
2022年《理工C》模拟卷6
2022年《理工C》预测卷1
2022年《理工C》预测卷2
2022年《理工C》预测卷3
2022年《理工C》预测卷4
2022年《理工C》预测卷5
2022年《理工C》预测卷6
收藏本站
Ctrl+D
将本站加入到书签,做题找题搜题,快速快捷。
下载App
微信扫一扫打开
回到顶部