00:24 = Surface area to volume ratio 01:19= Fick's law 01:43 = Gas exchange in single-celled organisms 02:14 = Gas exchange in INSECTS 04:35= Gas exchange in FISH and the counter-current exchange principle 07:31 = Gas exchange in xerophytic/dicotyledonous plants 09:11= Gas exchange in HUMANS and the mechanism of breathing 12:46 = Exam questions and mark schemes

Hi everyone, I didn't mention different lung diseases because you technically don't need to learn about them for the exam, you just need to apply the knowledge from the video into data associated with different lung diseases. The cause/effect of the disease will be stated in the stem of the question usually.

I've got the AS exams in two days and am using this for some nice last minute revision. Pray for me-

@AlevelBiologyHelp

3 жыл бұрын

You'll do amazing 😉

@victoryjane2910

3 жыл бұрын

Mines today in a couple of hours sigh

@AlevelBiologyHelp

3 жыл бұрын

@@victoryjane2910 Good luck, you'll do great! :)

@mihininja

3 жыл бұрын

@@victoryjane2910 damn, I hope you do/did well. Honestly this video saved me, there was a big marker which was pretty much word for word in this video

@UKINFLUENCERS..2881

2 жыл бұрын

@@mihininja how did you do? Should I watch these videos now haha

(sorry this is just to make my revision easier) 00:24 = Surface area to volume ratio 01:19= Fick's law 01:43 = Gas exchange in single-celled organisms 02:14 = Gas exchange in INSECTS 07:31 = Gas exchange in xerophytic/dicotyledonous plants

@nahibaaktar2252

2 жыл бұрын

dont be sorry this helped me lmao

I have an exam in a few weeks on this I don't know if I should be making notes or if I should do practice questions and learn the content through that way. by looking at the mark scheme memorising the answers. what would you say is better ?

@nadeemkhouri4054

3 жыл бұрын

I'd say UNDERSTAND the content, make sure you can recall the topics and do many exam questions on topics you struggle with, and even if you still struggle with the exam questions, just use the mark scheme and make sure you understand how they got the answer and try to learn from your mistakes. I have an end of year biology exam in a few weeks too. Good luck :))

@AlevelBiologyHelp

3 жыл бұрын

Hi! I would agree with Nadeem, so first of all, make sure that you've understood everything from your lesson/revision (please ask if you're the slightest bit unsure!). It's different for each person, but what worked for me was to reform the content into questions and make flashcards. For example, you would "Describe the adaptations of alveoli" on one side and "large surface area etc" on the other, and keep testing yourself until you've got them all right. I would then do as many practice questions as possible, look at the mark scheme, and add to your notes/flashcards the phrases that gain marks in the questions to give you a boost in the exam. Read the examiner's report (if it's available) to learn from previous students' mistakes. You could also try "blurting", where you write out everything you know, then fill in the gaps with a different colour, or make flashcards on the gaps in your knowledge. I have a couple of videos on exam skills if you want to check them out. Good luck!

life saver

at 9:10 you mentioned that the cuticle rolls to cover stomata snd how that lowers the water potential gradient and less water is lost by evaporation and you explain how the rolling of the cuticle lowers the water potenial. ps your videos are a life saver

13:57 you used the answer from the stem of the question, that means when they ask you how did they etc etc you need to look back at the context

@AlevelBiologyHelp

3 жыл бұрын

Yes that's correct! You need to refer to the method that they used!

05:59 states that one of the adaptations for gas exchange in fish is that the filaments are thin increasing the rate of diffusion. doesnt the rate of diffusion decrease becuase that is what I saw in the mark scheme???

@BawaDumi-Leslie

3 ай бұрын

I think it increases because it’s thin so it has a shorter diffusion distance = increase rate of diffusion

Tysm!

at 1:19 when you mention ficks law I've never come across it so im a bit confused on whether we need to know it or not :)

@AO-cu7xp

2 жыл бұрын

Fick's law was part of the old AQA specification and is not on the specification anymore. So, no you do not need to know it for this exam board any more, it just helps with a better understanding of diffusion rates. :)

@AmiraMohamed-zo3zt

2 жыл бұрын

@@AO-cu7xp Thank you!!

@AlevelBiologyHelp

2 жыл бұрын

@@AO-cu7xp Thank you. Exactly right

hello, is this everything you need to know for exams, also do you thibk I have time to go through all of AS content in 2 weeks and 2 days, not sure if I could

@SnellyDoggy

Ай бұрын

easy my a level exam is in an hour 😂

How do you know the answers so specifically I struggle with this and end up writing too much

@AlevelBiologyHelp

2 жыл бұрын

I used to do that when I was doing my A Levels. My advice would be to practise loads of exam questions and study the mark scheme so you get used to how much you need to write. I have a video on overcoming the mark scheme if you might find that useful :)

lol i have a test tommorow and havent revised

@AlevelBiologyHelp

3 жыл бұрын

Don't panic! Just quickly read over the parts that you think you struggle with the most, stay calm and try your best! You've got this :)

Got my test tmr send help 😂

@AlevelBiologyHelp

2 жыл бұрын

How was your test?