Maximum magnitude of root pressure is approximately:
That points to B: 0.5–0.6 MPa. Compared with the other options, 0.5–0.6 MPa is the one that correctly describes the WATER TRANSPORT concept. The wrong ones are A) 0.05 MPa; C) 5 MPa; D) 10 MPa. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.