本题目来源于试卷: Interaction & Interdependence C.9 Transfers of Energy & Matter,类别为 IB生物学
[单选题]
There is continuous c r,lq ysmc w5/gr q0 ov8,eh3(h31bffiycling of carbon from the atmosphere to other carbo;. 7 +skvqcqka0vs9- .j /fwbl1nhtkgil 8:hm n sinks. Which is the main source of energya/ s-.ln w1 8shtv 7hkb+9g m:;kivj.fkqlc0q for the carbon cycle?
A. Heat
B. Sunlight
C. Chemical energy
D. Energy from respiration
参考答案: B
本题详细解析:
Explanation: Energy from the Sun (Choice B) is used to form carbon compounds through the process of photosynthesis. Heat (Choice A) is a form of energy that cannot be converted to chemical energy by living things. Chemical energy (Choice C) is held in the bonds of organic compounds which are produced by photosynthesis, or comes from hydrothermal vents deep in the oceans. Even though it is an energy source, it is not the main source of energy for the carbon cycle. Energy stored in chemical bonds is released (Choice D) during respiration forming ATP which is used to power the cells metabolic processes.
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