The transport of sucrose from companion cells into sieve tube elements depends upon ______.

A) diffusion
B) pump
C) cotransport
D) antitransport
E) osmosis

Sucrose transport from companion cells into sieve tube elements in plants occurs through a process known as cotransport. This involves the simultaneous transport of sucrose along with another molecule, typically hydrogen ions (H+), across the cell membrane. This process is energy-efficient and allows for the accumulation of sucrose in the sieve tube elements, facilitating its transport throughout the plant.