Q.1
Growing degree days concept is originated from
- Physiological Basis of Growing Degree Days (GDD):
- Thermal time and heat unit calculations stem from biochemical thermodynamics: enzymatic reaction rates in plants double with every 10 °C temperature rise within physiological limits ($Q_{10} \approx 2$).
- This temperature-rate dependency originates from van 't Hoff's law / Arrhenius rule governing chemical reaction kinetics. (Correct answer: Option 4)
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