Geo-Scientist Prelims 2020 General Studies Q4: The amount of sun energy trapped by plants is:

Answer: (a) 1 % - 3 %

Plants fix only about 1–3% of incident sunlight (often quoted as ~1–2% of PAR) as gross primary production. The rest is reflected, transmitted or lost as heat and in transpiration. Remember: 10% law applies to transfer between trophic levels, not to light capture.