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2. What are sieve tube elements?

  • Living cells found in phloem that form the tube for transporting solutes. They have no nucleus and few organelles. They are supported by companion cells which carry out the living functions for sieve cells.
  • Living cells that 'sieve' out what solutes are allowed through and those that aren't
  • Dead cells that 'sieve' out what solutes are allowed through and those that aren't

3. What is cohesion?

  • The sticking together (attraction) between molecules of the same type.
  • Suction that causes molecules to be pulled.

4. What evidence is there for mass flow?

  • If a ring of bark is removed from a woody stem a bulge forms above the ring because the sugars can't move past the area where the bark has been removed. This is evidence that there is a downward flow of sugars.
  • If a ring of bark is removed from a woody stem a bulge forms below the ring because sugars can't move past. This is evidence that there is a upward flow of sugars.

5. What is translocation?

  • The evaporation of water from cell walls.
  • The movement of solutes to where they're needed in a plant.
  • The movement of water from the roots to the leaves.
  • The evaporating of water from a plant's surface.

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