任务九测试1.Biotic community and abiotic environment functioning as a system. Includes organism-complex and whole complex of physical factors is called ecosystem. ( )
A:对 B:错
答案:A
2.Ratio of carbon fixed (photosynthesis) per unit of water lost (transpiration) is called Water Use Efficiency. ( )
A:对 B:错 3.The ratio of dry matter production to the assimilation of a particular nutrient element, usually expressed as grams per gram is called Nutrient use efficiency ( NUE). ( )
A:对 B:错 4.Standing crop biomass is amount of accumulated organic matter in an area at a given time. ( )
A:错 B:对 5.Photosynthetic efficiency is the percentage of the energy in sunlight that is converted to net primary production during the growing season. ( )
A:对 B:错 6.Only 5%– 20% of assimilated energy passes between trophic levels. ( )
A:对 B:错 7.Ecosystem have ( ) major food chains( ).
A:One
B:three
C:Four
D:Two
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