01:09 = Function of the xylem 02:39 = Cohesion-tension theory 04:53 = Function of the phloem 05:55 = Mass flow hypothesis (translocation) 09:09 = Ringing experiment 10:08 = Tracer experiment 11:27 = Exam questions and mark schemes

thank you, these videos are a great help especially the EQ walk throughs

thank you so much for these videos. the textbook is useless to me so you are a lifesaver!!

Wonderful video particularly the questions at the end.

This video was so helpful, thank you

id honestly be lost and probably would've failed without you :)

at 5. on mass flow hypothesis, shouldn't it be water exit by osmosis then decreased hydrostatic pressure? it doesnt make sense to me

8:20 do u mean d sucrose is transported by diffusion, and isn't sucrose to big to pass through the cell through diffusion

I have a question. When you were explaining the process you said "to the companion cells" but in the mark scheme it said "by the companion cells" could you just explain that please as I am a little confused. Thank you ❤️

@AlevelBiologyHelp

3 жыл бұрын

Hi! I explained the mass flow hypothesis in quite a lot of detail, but in reality you only need to know it on the level of detail that the mark scheme says. So you can write "by companion cells" in the exam😁. I hope that helped?

@AlevelBiologyHelp

3 жыл бұрын

So basically I said sugars are transported to the companion cells then the phloem but in the exam you just need to write that the sugars are transported into the phloem via companion cells as companion cells are like an intermediate step if you get what I mean?

for 7:20, number 3 shouldnt it be "decreases the volume and therefore increases the hydrostatic pressure" ? not the other way around?

@AlevelBiologyHelp

3 жыл бұрын

Hi! Hydrostatic pressure is pressure created by large volumes of liquid. So if there is a high volume of liquid (water), this creates a high pressure. So hydrostatic pressure doesn't work in the same way in which gaseous pressure, in which high volumes would decrease pressure. Hope that makes sense? :)

@unaestrella1876

2 жыл бұрын

@@AlevelBiologyHelp ohh so increased the volume of water (liquid) , the space isn't increasing. Got you got you

@7.34 how come the sugar molecules leave by osmosis if the concentration of them has decreased? or is there still a large enough concentration gradient maintained for them to leave?

@AlevelBiologyHelp

3 жыл бұрын

Hi, that is a typo and is supposed to say water! Sorry about that :)

@goldenegg7949

3 жыл бұрын

@@AlevelBiologyHelp don’t worry, thankyou anyway !

at 12:43 can you say by co-transport instead of Active transport?

@AlevelBiologyHelp

3 жыл бұрын

I think you would get the mark because it's technically co-transport, although it doesn't say "accept co-transport". It doesn't say "do not accept co-transport" so that should be fine :)

Does anyone know if you specifically need to use sieve tube elements as a key word or is it okay just to say 'phloem' or 'phloem cells'

@bombaclart3910

Жыл бұрын

To be on the safe side use sieve tube elements.

@dfszf4743

Жыл бұрын

i think sieve tube elements as we all know how picky mark schemes are

Do you not need to know the apoplast and symplast pathways for transpiration?

@AlevelBiologyHelp

2 жыл бұрын

No, not for AQA anyway.

@AvaSun-yo2wy

2 жыл бұрын

@@AlevelBiologyHelp thank you so much for clarifying!

8:10 did you mean water moves out through osmosis

@AlevelBiologyHelp

3 жыл бұрын

Yes, that is a typo! Sorry about that! :)

@alyasaalam2938

3 жыл бұрын

@@AlevelBiologyHelp ah ok, thanks i was a bit confused... (:

is this truly all you need to know for this topic or is this more of a summary ?

@AlevelBiologyHelp

3 жыл бұрын

Hi, this is all you need to know!

@Ummmmmmmmmmmmmmmmhm

3 жыл бұрын

@@AlevelBiologyHelp is the pot meter practical not needed

👍😗

Is this all we need to know like all the content for the specification for aqa?? I’m surprised

@AlevelBiologyHelp

Жыл бұрын

Yes :)

@kristian2529

10 ай бұрын

Only for the advanced information from last year theres more content