2009年6月12日 星期五

選擇題題目 3-3

請問物質循環間之能量是如何流動的?
ⓐ能量為雙向流動ⓑ能量為單向流動ⓒ能量會流動,但有時雙向有時單向ⓓ 能量不會流動

作業:3.3.4.1~3.3.4.2重點

3-3 Energy Flow and Nutrient Recycling Sustain Ecosystems

1.Ecosystem and the biosphere are sustained through a combination of one-way energy flow from the sun and nutrient recycling. These two scientific principles of sustainability arise from the structure and function of natural ecosystems,the law of conservation of matter,and the two laws of thermodynamics.

此段重點為: 生態系統與生物圈被維持著是藉由結合單向的能量流動來自於太陽和營養循環.


2.Decomposers and detritus feeders are absolutely essential to life on the earth.They complete the cycling of matter by breaking down organic matter into simpler nutrients that can be reused by producers.Without decomposers and detritus feeders,the planet would be overwhelmed with plant litter,dead animal bodies,animal wastes,and garbage.In addition,most life as we know it could not exist because the nutrients stored in such wastes and dead bodies would be locked up and unavailable for use by other organisms.

此段重點為:分解者與生產者在地球上是絕對不可或缺的,它們能讓自然界中的物質能順利循環.

此兩段都在說明:物質循環與能量流動