Author: Freesciencelessons via YouTube
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In this video, we look at translocation in the phloem. First we explore what is meant by a source and a sink. We then explore how active loading of sucrose into the phloem takes place in the source and how this leads to mass flow of assimilates in the phloem. Finally, we look at the evidence for this active model of translocation.

Image credits:

Leaf with sun

https://commons.wikimedia.org/wiki/File:-_leaf_with_sun.jpg
Govindaraj Mahalakshmi, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Potato Plant
https://commons.wikimedia.org/wiki/File:Potato_plant_.jpg
Arg12730, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Roots
https://commons.wikimedia.org/wiki/File:Hyacinth_roots_-_contractile_and_standard_types_in_air.jpg
Rosser1954, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Shoot

https://commons.wikimedia.org/wiki/File:Its_first_true_leaf_-_Flickr_-_In_Memoriam,_sa_ku_ra.jpg
sakura from between places, CC BY 2.0 https://creativecommons.org/licenses/by/2.0, via Wikimedia Commons

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