According to Fick’s law, diffusion flux is directly proportional to:
Answer: C) Concentration gradient. For BASICS of PLANT, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Distance travelled; B) Temperature only; D) Molecular weight. Name the process first, then pick the option that describes it — don’t reverse cause and effect.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.