Biology; Chemistry; Physics: Post your doubts here!

[***amd***]

Does anyone have nay good notes for Bio ATP? I mean the same like i posted the link for the physics one on Dark Destination 's profile

Chemistry ATP is not a problem. That's just repeated questions, and same pattern.
For Physics ATP i'll read those notes..

But yeah, we need notes for Bio atp. .-.

that's all i could do

 

[***amd***]

https://www.xtremepapers.com/community/attachments/biology-6-png.39439/
how does cornea help in focusing the image?

 

[Awesome12]

https://www.xtremepapers.com/community/attachments/biology-6-png.39439/
how does cornea help in focusing the image?

As per examiner report:
Many candidates did not realise that refraction occurs at the interface of the air and the conjunctiva (2). The
lens (3) is obviously involved, as are the muscles (4) of the ciliary body, but the iris (1) plays no part in
focusing.

 

[kirann]

Which experiments for bio and physics are important?

 

[kirann]

What is the curve of bestfit...

 

[Bhaijan]

I have a question from Chemistry O Level November 2011 Variant 11 (paper 1) Question Number 24.
5070_w11_qp_11
What part of Chemistry is this question? And how do you arrive at the answer?

 

[Bhaijan]

5070_w11_qp_11

 

[Faizan Muhammmad]

My Maths.

you should have tkaen add maths then you wouldnt be crying over simple maths

 

[Faizan Muhammmad]

5070_w11_qp_11
View attachment 40475

B

 

[Faizan Muhammmad]

I have a question from Chemistry O Level November 2011 Variant 11 (paper 1) Question Number 24.
5070_w11_qp_11
What part of Chemistry is this question? And how do you arrive at the answer?
View attachment 40474

C
the air chapter and metals chapter
oxygen in tube is used up only

 

[funky brat]

I have a question from Chemistry O Level November 2011 Variant 11 (paper 1) Question Number 24.
5070_w11_qp_11
What part of Chemistry is this question? And how do you arrive at the answer?
View attachment 40474

In 24th the test tube initially contains air which has almost 21% oxygen in it. So the oxygen in the air reacts with the steel forming rust. Water level at the beginning of experiment is at D so it will reach C approximately when 21% of the tube contents have reacted

 

[funky brat]

https://www.xtremepapers.com/community/attachments/biology-6-png.39439/
how does cornea help in focusing the image?

Cornea is an optically denser medium than air so when light moves from air (optically less dense medium) to the cornea, it is refracted inwards.

 

[funky brat]

which paper was it.....

I don't remember actually. I'll find and then tell.

 

[exploded diper]

I don't remember actually. I'll find and then tell.

k

 

[exploded diper]

What is the curve of bestfit...

its a smooth curve ....cutting most of the points.......u can skip the points but if u skip two points one must be above the curve and the other below....

 

[exploded diper]

I don't remember actually. I'll find and then tell.

So u found the paper....................

 

[funky brat]

So u found the paper....................

You're so curious to know a question in the paper.

 

[funky brat]

Okay let's start discussing Biology ATP.
Describe two experiments that demonstrate how water is carried up the plant.
Describe two experiments to show the presence of stomata on the underside of the leaves.

 

[Awesome12]

Describe an experiment that relates force, mass and acceleration

 

[funky brat]

Describe an experiment that relates force, mass and acceleration

The one using the cars that travel on a ramp?