Q.

Ecosystems are not exempt from second law of thermodynamics because 

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a

decomposition (endothermic reactions) is their only source of energy

b

all the ecosystems have a single celestial source of energy - sun

c

they consists of food webs in which energy flows in a multidirectional manner

d

they need constant supply of energy to synthesise the molecules they require

answer is D.

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Detailed Solution

Ecosystems are not exempt from the Second Law of thermodynamics. 

They need a constant supply of energy to synthesis the molecules they require, to counteract the universal tendency toward increasing disorderliness. 

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