In a grassland ecosystem, the grass is eaten by grasshoppers, and the grasshoppers are eaten by frogs. What role does the frog play in this ecosystem? A. Producer B. Primary consumer C. Secondary consumer D. Tertiary consumer 相关知识点: ...
解析 C。解析:在草原生态系统中,以草为食的蝗虫是初级消费者(primary consumers)。草是生产者,蝗虫吃生产者,所以是初级消费者。选项A生产者是能够自己制造食物的生物,蝗虫不能。选项B二级消费者是以初级消费者为食的生物,蝗虫不是。选项D分解者是分解生物遗体等的生物,蝗虫不是。
Morphological characteristics and nutritive value of some grass species in an arid ecosystem. Grass For. Sci., 62: 104-108.Saini, M.L., P. Jain and U.N. Joshi, 2007. Morphological characteristics and nutritive value of some grass species in an arid ecosystem. Grass For. Sci., 62: 104...
known for its seasonal swan migrations, is home to eelgrass, a key species in China's temperate waters. Eelgrass serves as an important food source for swans during winter, helping protect the local marine ecosystem.
Carbon and water vapor exchange of an open-canopied ponderosa pine ecosystem and ecosystem respiration was large (3.5±0.1 and 4.3±0.1gCm 2 day 1 in growing season of 1996 and 1997, respectively) because of high air and soil... PM Anthoni,BE Law,MH Unsworth - 《Agricultural & Forest ...
In a grassland ecosystem, if the grass turns a dull gray - green instead of its normal bright green, it may suggest _. A. Overgrazing B. A coming rainstorm C. The presence of a new grass species D. A decrease in soil acidity 相关知识点: ...
In the grassland ecosystem, what does the grass provide for the sheep? A. Shelter B. Food C. Water D. Space 相关知识点: 试题来源: 解析 B。解析:在草原生态系统的食物链中,草是生产者,羊是初级消费者。羊以草为食,所以草为羊提供的是食物。A选项Shelter表示庇护所,草不是羊的庇护所;C选项...
Grass is a dominant species in a grassland ecosystem. This is because it represents the most biomass in that system. The grass in a grassland...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
ecosystem has formal status as endangered at state and national levels. Widespread species typically have high genetic diversity with low detectable differentiation among populations (Hamrick and Godt, 1989) and this is the case withMicroseris lanceolata, a once-widespread and abundant Asteraceae in ...
Which of the following shows the correct food chain in an ecosystem? A. grass-sheep-wolves B. wolves-sheep-grass C. sheep-wolves-grass D. grass-wolves-sheep 相关知识点: 试题来源: 解析 A。草是生产者,羊是初级消费者,狼是次级消费者。