Functional redundancy among SEP genes was revealed by mutation of:
Correct option is C, Triple SEP genes. In ABCE & ABCDE MODEL +Synapdrgon flowering problems like this, the accurate statement is Triple SEP genes; the others are common mix-ups. Not these: A) Single SEP gene; B) Double SEP genes; D) Only SEP4. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.