现代生命科学与人居环境答案2023秋

第二章测试

1.How many types of bacteria can be found in a spoonful of good soil?（ ）
A:75,000 B:750,000 C:7,500,000 D:7,500
答案:A
2.How many soil layers typically make up mature soil?（ ）
A:3 B:4 C:2 D:1 3.What role does soil play in the carbon cycle?（ ）
A:Important water resource B:Important energy source C:Important carbon storage D:Strengthening carbon sinks 4.What percentage of soil is made up of pores?（ ）
A:75% B:50% C:10% D:25% 5.What are the three principal characteristics of light that affect plant growth? （ ）
A:Quantity, quality, and duration B:Concentration, spectrum, and time C:Intensity, color, and frequency D:Brightness, wavelength, and period