Question

Root pressure theory cannot explain the ascent of sap because it is not found in

• A. Bryophytes
• B. All plants and in all seasons
• C. Trees
• D. Spring

Answer 1

Answer: (B)

All plants and in all seasons

Root pressure theory is proposed by Priestly. It is defined as the pressure which set up in the cortical cells of the roots due to the osmotic action under which water passes from the living cells of the root in the xylem and thus helps in the ascent of sap. The ascent of sap also occurs in plants without roots and root pressure. Thus this theory cannot explain the ascent of sap.

So the correct answer is 'All plants and in all season'.