【简答题】What is the importance of the water potential concept in plant physiology? What are the components of water potential? 2. Define and give an example of osmosis in a plant cell. What is the driving for...
【单选题】Two blocks are at rest on a horizontal frictionless surface with a compressed spring between them. The 10-kg block accelerates when the string holding the system in compression is cut and the 20-kg bo...