The paragraph illustrated in the question reminds me the first law of thermodynamics.
Explanation:
According to the first law of thermodynamics or law of energy conservation theory states that the total amount of energy of the universe always remains constant.Energy can neither be synthesized nor destroyed.Energy can only be transformed.
Both photosynthesis and cellular respiration obey the law of energy conservation or the first law of thermodynamics.Because during photosynthesis the light energy is converted to chemical energy that is stored in the chemical bonds present in glucose.
Whereas during cellular respiration the glucose is broken down by oxidation to release free energy in form of ATP.
