1 . About fifty years ago, plant physiologists set out to grow roots, by themselves in solutions in laboratory flasks. The scientists found that the nutrition of isolated roots was quite simple. They required sugar and usual minerals and vitamins. However, they did not require organic nitrogen compounds. These roots got along fine on mineral inorganic nitrogen. Roots are capable of making their own proteins and other organic compounds. These activities by roots require the energy of course. The process of respiration uses sugar to make the high-energy compound ATP, which drives the biochemical reactions. Respiration also requires oxygen. Highly active roots require a good deal of oxygen. 1.What is the main topic of the passage ?
- A. The relationship between a plant's roots and its shoots
- B. what can be learned by growing roots in isolation
- C. How plants can be grown without roots
- D. How plants can be grown without roots
View Answer
|
Discuss in Forum
|
Workspace
|
Report
|
2 . What is the main topic of the passage?
- A. The role of George Washington in the American Revolution.
- B. The founding of Washington, D.C.
- C. The first years of the United States Congress.
- D. The governing of the federal district.
|
View Answer
|
Discuss in Forum
|
Workspace
|
Report
|
3 . What is the main topic of the passage?
- A. All states should follow California's example in using small-claims courts in order to free judges for other work
- B. The legislature needs to formulate fewer laws so that the judiciary can catch up on its older cases
- C. Nobody seems to care enough to attempt to find methods for making the judicial system more efficient
- D. While there are many problems with the court system, there are available suggestions for improvement El The judiciary in jeopardy
- D. None of them
|
View Answer
|
Discuss in Forum
|
Workspace
|
Report
|