Which gene is Arabidopsis homolog of Antirrhinum FLO gene?
LFY (B) is correct here. This is core ABC MODEL: once you know the definition or pathway step, LFY is the clear fit. The wrong ones are A) AP1; C) AG; D) PI. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.