Putting Plants to Work Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide, and water into sugars and starches, stored energy that the plants can use. This conversion process is called photosynthesis. Unfortunately, unless youre a plant, its difficult and expensive to convert sunlight into storable energy. Thats why scientists are taking a closer look at exactly how plants do it. The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches. But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen. Ghirardi says. For example, algae will produce hydrogen in an airfree environment. Its the oxygen in the air that prevents algae from making hydrogen most of the time. Unfortunately, removing the sulfate also makes the algaes cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells activity and produce larger quantities of hydrogen. What does the writer say about plants concerning solar energy? B Plants have been used to produce solar energy. D Plants have been a source of solar energy. A Because they want algae to produce sugars and starches. C Because they want to turn plant sugars to a new form of energy. According to the fifth paragraph, under what conditions are algae able to use solar energy to make hydrogen? B When there is no oxygen in the air. D When enough starch is stored. A It is not possible to remove sulfate from the environment. C It is not easy to make sugars instead of hydrogen. What is NOT true of algae? B They can be a very good fuel source. D They can be used in many ways.
陕旅版英语六上《Lesson 6 My room is very nice》教学设计
陕旅版英语六上《Lesson 13 What are you going to do tomorrow》课件1
陕旅版英语五上《Lesson 2 What s the weather like》课件3
陕旅版英语六上《Lesson 1 May I use the telephone》课件3
陕旅版英语六上《Lesson 10 I have a headache》课件1
陕旅版英语六上《Lesson 11 See a doctor》课件1
陕旅版英语六上《Lesson 1 May I use the telephone》课件1
陕旅版英语六上《Lesson 13 What are you going to do tomorrow》课件2
陕旅版英语四上《Unit 7 It s Tuesday》课件3
陕旅版英语四上《Unit 6 What Subjects Do They H》课件1
陕旅版英语五上《Lesson 14 I m going to Xi an》课件3
陕旅版英语六上《Lesson 14 Will he teach you next term》导学案
陕旅版英语四上《Unit 5 Our School》课件4
陕旅版英语六上《Lesson 4 Where are they》课件1
陕旅版英语六上《Lesson 11 See a doctor》课件2
陕旅版英语五上《Lesson 9 What s the date today》课件3
陕旅版英语六上《Lesson 1 May I use the telephone》课件2
陕旅版英语六上《Lesson 14 Will he teach you next term》课件1
陕旅版英语六上《Lesson 14 Will he teach you next term》课件2
陕旅版英语六上《Lesson 4 Where are they》教案
陕旅版英语六上《Lesson 12 We are going to see》课件1
陕旅版英语五上《Lesson 2 What s the weather like》导学案
陕旅版英语五上《Lesson 13 I m going to Hainan》课件3
陕旅版英语六上《Lesson 11 See a doctor》课件4
陕旅版英语四上《Unit 4 When Do You Have Classe》课件1
陕旅版英语五上《Lesson 2 What s the weather like》课件1
陕旅版英语六上《Lesson 11 See a doctor》课件3
陕旅版英语五上《Lesson 14 I m going to Xi an》课件1
陕旅版英语四上《Unit 5 Our School》课件3
陕旅版英语五上《Lesson 2 What s the weather like》课件2