Radiation Use Efficiency (RUE) of leaf canopy is approximately:

Correct option is C

· RUE ≈ 1.5–2.5% for most C₃ crops.
· % of incident solar radiation converted into biomass.
Why other options are wrong
· (a) Too low.
· (b) Lower than physiological minimum.
· (d) 10% is far above biological limits.