mass flow hypothesis

• What does the mass flow hypothesis best explain?

  Phloem transport
• 1. MASS FLOW HYPOTHESIS

  2. Active transport used to actively load solutes from companion cells into the sieve tubes of the phloem at the source
  3. this lowers the ψ inside sieve tubes, so water enters tubes by osmosis from xylem and companion cells
  4. =creates a high pressure inside the sieve tubes at the source end of the phloem