Physics, Chemistry and Biology: Post your doubts here!

[Laura Kate]

any of guys have the textbook pdf version of
Essential Biology for Cambridge IGCSE®-ISBN: 978-0-19-839920-9
Essential Chemistry for Cambridge IGCSE ISBN: 978-0-19-835518-2
Essential Physics for Cambridge IGCSE ISBN: 978-0-19-841770-5

 

[Laura Kate]

any of guys have the textbook pdf version of
Essential Biology for Cambridge IGCSE®-ISBN: 978-0-19-839920-9
Essential Chemistry for Cambridge IGCSE ISBN: 978-0-19-835518-2
Essential Physics for Cambridge IGCSE ISBN: 978-0-19-841770-5

 

[princess of cricket]

High concentration of water and high water potential are the same terms BCS both terms mean that there is solute in the soloution

 

[princess of cricket]

Q explain what may happen to the cells lining the trachea in a smoker and how this may affect the person's health ?
Q describe and explain what might happen to a person's breathing as they climb up a mountain
Q explain why it is important for a man to maintain a constant body temperature of 37 degrees .

I was studing respiration and homeostasis and found trouble in answering these questions . Could u guys help me out .

 

[Ayesha Asif333]

Ok so why does a solution having high concentration of of water said to have a higher water potential?

High concentration of water and high water potential are the same terms BCS both terms mean that there is solute in the soloution

Emmris....is she right about that becz i am confused now

 

[Ayesha Asif333]

Tobacco smoking causes lung cancer...the smoke makes the lining of the trachea produce more mucus that travels don to the bronchioles and alveoli rendering them unfit for the diffusion of gases, the mucus can become a breeding ground for the bacteria which will then cause chronic infections also the cilia lining the air passage stops beating

 

[Ayesha Asif333]

Less oxygen higher up so the breathing rate increases.

 

[Ayesha Asif333]

The constant temp is necessary for the enzymes to function properly..these r biological catalyst so can be affected by temp
And enzymes r like really very important so can't live without them functioning properly

 

[Ayesha Asif333]

Who remembers...

 

[Emmris]

Emmris....is she right about that becz i am confused now

I knew z answer but 4got it I need 2 go through my notes then I'll tell u

 

[Mohammed alomary]

Can someone share a source on how to get question papers for igcse may June 2017 physics papers or biology papers for 41 or 61 or 21

 

[Ayesha Asif333]

https://justpastpapers.com.
See if you can find them here
If not then you will have to wait up untill they r officially available

 

[Ayesha Asif333]

I knew z answer but 4got it I need 2 go through my notes then I'll tell u

Take your time

 

[Mohammed alomary]

Okay thanks for ur help

 

[Emmris]

Take your time

I got it

So, as u know, high water potential means that there is high water molecules which are free to move i .e there is less solute bonded 2 water molecules but for low water potential, there is more solute bonded 2 water molecules , hence, there is less water molecules that are free 2 move. Water has the tendency 2 move freely from both high water potential 2 low water potential n vice- versa but the one who has more free H2O molecules movement will b seen . As a result, it xplains day H2O moves from high w.p 2 low w.p .

 

[Emmris]

Emmris....is she right about that becz i am confused now

she's right it's just dat we don't normally say dat z water is concentrated !!! It just don't make sense ! So this term "concentrated" does fit so well though u will get ur points if u wrote them.

 

[Ayesha Asif333]

Thank you loads emmris for clearing stuff up

 

[Emmris]

It's alright

 

[princess of cricket]

Do u guys have bio ATP notes

 

[Emmris]

Do u guys have bio ATP notes

On which topics do u want?