First law of thermodynamics corresponds to

Explanation

(i) It states that energy can be transmitted from one system to another in various forms.
(ii) Energy cannot be destroyed or created. But it can be transformed from one form to another.
(iii) As a result, the quantity of energy present in the universe is constant.
Example: In photosynthesis, the product of starch (chemical energy) is formed by the combination of reactants (chlorophyll, `H_(2)`,O, `CO_(2)`). The energy stored in starch is acquired from the external sources (light energy) and so there is no gain or loss in total energy. Here light energy is converted into chemical energy.
`6"CO"_(2)+6"H"_(2)"O"underset("Chlorophyll")overset("light")to"C"_(6)"H"_(12)"O"_(6)+6"O"_(2)`
Light energy `to` Chemical energy.