Starch–sugar interconversion theory of stomatal movement was proposed by:
B fits best: Lloyd. Keep the STOMATA MOVEMENT basics straight and Lloyd stands out as the precise answer. Avoid: A) Imamura; C) Levitt; D) Münch. 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.