A Level Biology Revision "Translocation in the Phloem"
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- Опубліковано 19 жов 2022
- You can find all my A Level Biology videos fully indexed at www.freesciencelessons.co.uk/...
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:
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Potato Plant
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hi, just wanted to say how helpful your videos are! i achieved 9’s in all sciences and i’d like to say watching your videos played a huge part in it! Now i’m doing a level biology and chemistry and just wondering how much of the a level content are already posted on your channel and how much left there is to cover? thanks
Hi. Thanks for the comment. I'm glad that you're finding my videos useful. I'm now around 45% of the way through both Biology and Chemistry A level, so I'm nearly finished the AS content.
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Thanks for the comment. I'm happy to be able to help.
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4:24 Hello Shaun, one question, could it also be, because of the reduced water potential of the cells in the sink and therefore the increase W.P. in the phloem, that water ALSO moves into the cells in the sink?
ik this is extremely late, but yes you're right
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1st comment
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Hi sir, I am a big fan of your videos but I wonder how you manage to provide these videos for free. Do you make money from ads?
Hi. I produce all the videos entirely by myself with no staff at all. The ads provide an income. I also sell workbooks. Together these allow me to provide the videos for free. I'm glad that you like them.
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i dont understand..where do the hydrogen ions come from
Hydrogen ions are naturally present in the cytoplasm due to the splitting of water molecules.
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