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

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