Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

and mcq 2 also...

 

[Awesome12]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s10_qp_12.pdf

For the second MCQ
A 25 year old is more likely to need more iron and energy as he is a active being

19th MCQ
The air pressure inside the lungs is decreasing but it is also becoming equal to the atmospheric pressure. Thus although the contraction of the diaphragm also causes this, it only decreases the pressure inside the lungs below the atmospheric pressure. However, exhalation causes air to move inward thus returning pressure in lungs to the normal

 

[exploded diper]

For the second MCQ
A 25 year old is more likely to need more iron and energy as he is a active being

19th MCQ
The air pressure inside the lungs is decreasing but it is also becoming equal to the atmospheric pressure. Thus although the contraction of the diaphragm also causes this, it only decreases the pressure inside the lungs below the atmospheric pressure. However, exhalation causes air to move inward thus returning pressure in lungs to the normal

its a she...in the second one...
k thx...

 

[Awesome12]

its a she...in the second one...
k thx...

 

[exploded diper]

just saying the question say the energy intake and stuff about a female....

 

[Awesome12]

just saying the question say the energy intake and stuff about a female....

She might be pre*****

 

[exploded diper]

okay...

 

[Dark Destination]

I thought you wre a Chem master

Have forgotten everything.
I am taking hours to read the starting portions about atoms and molecules. .-.
And don't even have time to practice past papers. :/
No longer a Chemistry master

 

[Menna Mohammed]

Why is the total of the subject 200, where do they get those 40 marks? :O

 

[Dark Destination]

Why is the total of the subject 200, where do they get those 40 marks? :O

Which subjects? IGCSE or O-Level?

 

[Menna Mohammed]

Which subjects? IGCSE or O-Level?

IGCSE :/

 

[peacce]

??exxplain

 

[peacce]

please tel me ;(

 

[kirann]

View attachment 41719
??exxplain

box 1 = XX (girl)
box 2=XY (boy) cuz it has Y which dominate on x
box 3= XY (boy)
box 4= XX (girl)
ratio is always 1:1

 

[kirann]

View attachment 41720 please tel me ;(

c?

 

[kirann]

plx explain

 

[princess Anu]

check the answers first
c,d,a,a,c?

View attachment 41721View attachment 41722View attachment 41723View attachment 41724

View attachment 41725
plx explain

 

[princess Anu]

For the second MCQ
A 25 year old is more likely to need more iron and energy as he is a active being

19th MCQ
The air pressure inside the lungs is decreasing but it is also becoming equal to the atmospheric pressure. Thus although the contraction of the diaphragm also causes this, it only decreases the pressure inside the lungs below the atmospheric pressure. However, exhalation causes air to move inward thus returning pressure in lungs to the normal

SO whats the answer for 19? why isn't it C

 

[princess Anu]

Q whats the difference between reflex arc ,reflex action and Spinal reflex?
and Is it that in every reflex action brain is not involved although the impulses do travel towards it but spinal cord coordinates the response?
Correct me if I'm wrong?

 

[funky brat]

Faizan Muhammmad