功夫海牛 asked in 科學生物學 · 2 decades ago

生物能量與營養物質循環的問題!(原文)

Which of the following statements is true about chemical nutrients in an ecosystem?

1:They flow through the system, losing some nutrients in the process.

2:They cycle within the ecosystem and are constantly reused.

3:They can be converted into energy.

4:They depend on sunlight as their source.

5:They cannot be obtained from decomposition.

3為什麼不能選呢?

1 Answer

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  • 2 decades ago
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    在生物學上的chemical nutrients 通常指碳、氮、磷、硫等化學元素(其實還有很多其他元素,但較少討論),他們都會在生態係內循環,但磷、硫的循環不完全,所以會有些在每次的循環中流失,而無法輕易回到循環中。

    而3.的選項應該是指直接將化學物質轉變為能量,這.......生物又不是核彈。依照物質不滅,這些物質可不會被直接轉成能量。一般生物反映中的能量是藉由化學鍵的斷裂與形成所釋放,不是直接把物質變成能量。

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