translocation

Question 1

describe translocation

Answer 1

Sucrose starts in a source cell, moves into a companion cell and moves into a sieve tube element. Sieve tube elements are responsible for transporting the sucrose solution throughout the plant. They contain sieve plates, which have holes the sucrose solution can travel through. There, the sucrose solution moves up or down through the sieve tube elements. When it gets to where it is needed, the sucrose solution moves into a second companion cell and then into the desired sink cell.

Question 2

Ringing experiment

Answer 2

phloem removed from part of the plant
swelling above the ring
roots of plant start to die

Question 3

tracers

Answer 3

Tracers are radioactive substances that can be taken up by plants. The movement of tracers through the plant can be visualised using scanners.