Biology; Chemistry; Physics: Post your doubts here!

[fatima0000]

Do you have the book "A complete course for O'level" by Charles Chew?

yeah..

 

[Saad Mughal]

yeah..

Well, in Chapter 15, go to topic "Applications of Converging Lenses", the syllabus point is covered in that topic.

 

[AhsanAfzal]

i want biology atp notes

 

[sweetiepie]

i want biology atp notes

ATP Notes
http://www.xtremepapers.com/community/threads/atp-notes.20798/

 

[AhsanAfzal]

how can we see chloroplasts in a microscope?

 

[AhsanAfzal]

how can we see chloroplasts in a microscope?

is there any dye for it?

 

[usama321]

Graphs:
Axes: labelled both quantity and unit
labels and quantities to be on correct axes

Scales: must fill at least ½ grid in both directions i.e. cannot be doubled
must be ‘sensible’, i.e. not multiples of 3, 7 etc.
should follow instructions, e.g. start from the origin
should have at least three values marked

Points: allow x, • or
☼
(dot maximum size 1 mm diameter i.e. ½ small square)
must be accurately plotted to ± ½ small square
not awarded if scale not sensible

Line: attempt at single smooth line:
curves need not be perfect!
straight lines - must be drawn with a ruler
- must be best fit i.e. equal number of points above and below line
- must not be skewed, i.e. not points at start/end all above/below the line
just saw this in the paper 4 winter 09 ms. It says equal points above and below line Saad Mughal

 

[Saad Mughal]

Graphs:
Axes: labelled both quantity and unit
labels and quantities to be on correct axes

Scales: must fill at least ½ grid in both directions i.e. cannot be doubled
must be ‘sensible’, i.e. not multiples of 3, 7 etc.
should follow instructions, e.g. start from the origin
should have at least three values marked

Points: allow x, • or
☼
(dot maximum size 1 mm diameter i.e. ½ small square)
must be accurately plotted to ± ½ small square
not awarded if scale not sensible

Line: attempt at single smooth line:
curves need not be perfect!
straight lines - must be drawn with a ruler
- must be best fit i.e. equal number of points above and below line
- must not be skewed, i.e. not points at start/end all above/below the line
just saw this in the paper 4 winter 09 ms. It says equal points above and below line Saad Mughal

I don't know for sure, but I've made a lot of graphs with 1 point above and 1 below but I did not know this was a necessity.
Besides, this is not in the Physics 09 winter paper.

 

[asma tareen]

it is our teacher told us

 

[usama321]

I don't know for sure, but I've made a lot of graphs with 1 point above and 1 below but I did not know this was a necessity.
Besides, this is not in the Physics 09 winter paper.

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s09_ms_4.pdf

 

[Saad Mughal]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s09_ms_4.pdf

Oh. Apologies.
I directly went to the answers.
Well, sorry for the confusion. Can't argue with the mark scheme.
"must be best fit i.e. equal number of points above and below line" it is then!

 

[AhsanAfzal]

C or A?

 

[asma tareen]

i think its A

 

[AhsanAfzal]

A is wrong is marking scheme

 

[asma tareen]

hmmm

 

[Saad Mughal]

C or A?

I don't know Biology but I think it's C.

 

[asma tareen]

y???

I don't know Biology but I think it's C.

 

[Hskk]

A is wrong is marking scheme

What's the right answer? None other than A make any sense

 

[Saad Mughal]

y???

Well because when we have flu or cold (viral infections), we don't take antibiotics because they are not effective (I know this).
A can't be the answer (what I think) because bacteria don't become immune to the antibiotics. Our body becomes immune to bacteria because of antibiotics (I know this is a weird explanation )

 

[asma tareen]

Well because when we have flu or cold (viral infections), we don't take antibiotics because they are not effective (I know this).
A can't be the answer (what I think) because bacteria don't become immune to the antibiotics. Our body becomes immune to bacteria because of antibiotics (I know this is a weird explanation )

well look a maths student is better in our subject
anyway thnx