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 *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #Alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel