A-Level Biology - Translocation & Mass Flow Hypothesis | How Active Loading Works (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. The process of translocation Understanding how assimilates like sucrose and amino acids are moved from sources to sinks The role of the phloem and sieve tube elements 2. The mass flow hypothesis How hydrostatic pressure gradients drive the movement of substances The movement of water and sucrose between the xylem, companion cells, and sieve tubes 3. The mechanism of active loading How proton pumps and co-transport proteins are used to move sucrose The movement of hydrogen ions against concentration gradients ** EXAM BOARD SPECIFIC INFO ** AQA - You don't need to know about active loading, but you do need to know extra information about evidence for and against the mass flow hypothesis OCR - Everything is relevant to your course! CIE - Everything is relevant to your course! ** CHAPTERS ** 0:00 Introduction to translocation 0:23 What is translocation? 1:45 Mass flow hypothesis explained 4:07 Active loading mechanism ** PLAYLISTS **    • KS3 Biology      • KS3 Chemistry      • KS3 Physics      • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel