Working in an airfree environment, however, is difficult. Its not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
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.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: You can grow them in a reactor, in a pond. You can grow them in the ocean. Theres a lot of flexibility in how you can use these organisms.
36. What does the writer say about plants concerning solar energy?
A Plants are the real experts in producing solar energy.
B Plants have been used to produce solar energy.
C Plants have been using solar energy for billions of years.
D Plants have been a source of solar energy.
37. Why do some scientists study how plants convert sunlight carbon dioxide, and water into sugars and starches?
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