Energy source NOT involved in chemical evolution was
Chemical evolution required abiotic energy to break stable gases into reactive radicals. Documented sources include lightning simulating electric discharge, intense ultraviolet radiation without ozone, and heat from volcanoes and meteorite impacts. These drove formation of monomers in Miller-Urey type experiments. Photosynthesis is a biological process evolving much later in anoxygenic bacteria and later cyanobacteria, converting light to chemical energy. It could not supply energy before life existed, so Photosynthesis stands apart as non-contributing to prebiotic synthesis. This concept integrates genetics, ecology and molecular evidence, frequently tested in NEET, GATE and CSIR-NET, highlighting links between genotype,
Ref: Alberts et al., Molecular Biology of the Cell, 6th ed., Chapter 1: Origin of Life.