Water absorption by roots is mostly:
B fits best: Passive. Keep the WATER TRANSPORT basics straight and Passive stands out as the precise answer. Avoid: A) Active; C) Energy-dependent; D) Carrier mediated. Light and flowering items often hinge on which photoreceptor or day-length rule is in play.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.