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Biology ISA Osmosis

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Gkdm

(edited 6 years ago)

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Reply 1

Holly1112000

Original post by lyeeta

Doing my Biology ISA on osmosis, hypothesis is "The greater the surface area exposed, the larger the mass of water absorbed"
I'm putting bits of potato in water and seeing how the surface area of the potato (Cut into different number of bits) affects the weight of water absorbed. However I don't really know what to put as the context. Any ideas?

I'm just about to start my ISA on this too the only thing i have been told is that you could link it to what is happening to your lungs when smoking i.e. the surface area?
not sure if this helps at all?!!

Reply 2

Moltenmo

Original post by Holly1112000

Talk about the alveoli and diseases such as emphysema.

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Reply 3

Holly1112000

Thank you also do you know the hypothesis?

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Reply 4

Moltenmo

Original post by Holly1112000

Thank you also do you know the hypothesis?

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Yes, as you increase the surface area of the plant tissue (in my case), the uptake of water by the plant increases.

Or the greater x is...the greater y is.

Also, give a scientific explanation. Very important! For example, increasing surface area means more particles are exposed. Obviously, write more than this.

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Reply 5

Holly1112000

Thank you that's really helpful!!

Reply 6

Moltenmo

Original post by Holly1112000

Thank you that's really helpful!!

Mine is tomorrow lol so this is fresh in my memory.

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Reply 7

Holly1112000

Original post by Moltenmo

Mine is tomorrow lol so this is fresh in my memory.

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Same but we haven't had much preparation it doesn't seem too difficult though and good luck!

Reply 8

Moltenmo

Original post by Holly1112000

Same but we haven't had much preparation it doesn't seem too difficult though and good luck!

Thanks and you too! I have had 3-4 lessons but most of my understanding has been independent since our teacher hasn't helped much. I just hope a question where they ask you to talk about a preliminary investigation or alternative method doesn't come up. I hate those kind of obscure questions which I haven't covered.

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Reply 9

Holly1112000

Original post by Moltenmo

That's not very helpful my teacher has been the same hopefully those sort of questions won't come up!! Thanks again for your help earlier!.

Reply 10

hodgy369

Hey Everyone, for paper 1 can anyone point me in the right direction for what to put for explaining the hypothesis, my hypothesis is "As the surface area of the potato increases, the amount of water intake increases".

Reply 11

Moltenmo

Original post by hodgy369

More particles exposed to the water, mention osmosis, boom. Got your 3 marks!

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Reply 12

hodgy369

Original post by Moltenmo

More particles exposed to the water, mention osmosis, boom. Got your 3 marks!

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Thanks mate you're a lifesaver

Reply 13

Moltenmo

Original post by hodgy369

Thanks mate you're a lifesaver

No problem :biggrin:

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Reply 14

username2828538

in paper 1 there is a question on a premlininary

Reply 15

Moltenmo

Original post by Authorbian

in paper 1 there is a question on a premlininary

Oh yeah, the question I messed up on lol

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Reply 16

username2828538

[QUOTE=Moltenmo;69777420]Oh yeah, the question I messed up on lol

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did your teachers not basically tell you all the awnsers before the test

Reply 17

Moltenmo

Original post by Authorbian

did your teachers not basically tell you all the awnsers before the test

Not for that question tbh

what question is Q4

Original post by megabang

what question is Q4

Can't give much away but I will give you some options:
-Alternative method
-Preliminary Investigation
-Method
Sorry, I don't want you to cheat your way through good grades 🚹