Second Law & Energy Flow in Ecosystems — NEET Biology
✅ Asked in NEET 2025Further, ecosystems are not exempt from the Second Law of thermodynamics. They need a constant supply of energy to synthesise the molecules they require, to counteract the universal tendency toward increasing disorderliness.
The Second Law of Thermodynamics states that every energy transformation increases disorder (entropy) in the universe. Ecosystems must continuously import energy from outside (sunlight) to build and maintain complex structures, because they cannot escape this law. Students often mistakenly think ecosystems are closed systems that recycle all energy indefinitely—they must remember that while matter cycles, energy flows one way and is constantly lost as heat. NTA tests this to ensure you understand why sunlight is essential for life and why ecosystems need continuous external energy input to counteract natural degradation.
(NEET 2025) Given below are two statements: Statement I: In ecosystem, there is unidirectional flow of energy of sun from producers to consumers. Statement II: Ecosystems are exempted from 2nd law of thermodynamics. In the light of the above statements, choose the most appropriate answer from the options given below:
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