Describe how sucrose is loaded into the phloem (3)

Hydrogen ions are pumped out of companion cells using ATP.This creates a high concentration of hydrogen ions outside of the companion cell. H+ ions diffuse down their concentration gradient back into the companion cell with sucrose through a co-transporter. Sucrose diffuses down its concentration gradient into the sieve tube elements through the plasmodesmata.

DR
Answered by Divyadharshini R. Biology tutor

6682 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Outline the role of the Golgi Apparatus:


Outline the sequence of events following the production of extracellular proteins that leads to their release from the cell. [3]


State the 4 stages of mitosis (2 marks)


What's the difference between the light dependent and independent reactions?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences