Biology; Chemistry; Physics: Post your doubts here!

[asadalam]

Yeah, probably.
Haven't done a single paper 2 as yet.

im starting p2 now...

 

[Abdul Hanan]

Yeah, probably.
Haven't done a single paper 2 as yet.

examiner changed in 2013 O/N (my teacher told)
very difficult paper 2 (22/O/N/13)
you should try it

 

[asadalam]

examiner changed in 2013 O/N (my teacher told)
very difficult paper 2 (22/O/N/13)
you should try it

I'll try it now

 

[funky brat]

examiner changed in 2013 O/N (my teacher told)
very difficult paper 2 (22/O/N/13)
you should try it

I'm going to try it.

 

[funky brat]

I am so stuck on paper 1, I don't even know when Im gonna start with paper 2. :|
Allah karay buhat easy paper ho i'A lekin percentile phir bhi kam ho. :3

Lol, yar easy ho jae bari bat hai.
Wese faida koi nahi hota, percentile high ho jati ha.

 

[funky brat]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_w12_qp_12.pdf
Got 36.
Can someone explain the first MCQ?
The process controlled by cell memebrane is osmosis, hence the second point and option C, how is that A?

 

[Fate0]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_w12_qp_12.pdf
Got 36.
Can someone explain the first MCQ?
The process controlled by cell memebrane is osmosis, hence the second point and option C, how is that A?

2 and 4 occur through the cell membrane but the the cell membrane does not control them.
In 1, active transport across the cell surface membrane actually uses energy to get the ions etc.

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_w12_qp_12.pdf
Got 36.
Can someone explain the first MCQ?
The process controlled by cell memebrane is osmosis, hence the second point and option C, how is that A?

I also chose C but i guess they meant controlling and since active transport involves controlling the inflow of ions while osmosis doesnt involve any control or energy so it would be A.This was really tricky though

My 1000th post

 

[Awesome12]

I also chose C but i guess they meant controlling and since active transport involves controlling the inflow of ions while osmosis doesnt involve any control or energy so it would be A.This was really tricky though

My 1000th post

Too bad I can't delete my post and then post again
Hey in the same paper, can you explain 25

 

[Abdul Hanan]

i found this MCQ file very helpful (must see it)
sorry if it was posted by someone already

 

[asadalam]

Too bad I can't delete my post and then post again
Hey in the same paper, can you explain 25

Its C i think cuz if there are more smokers b4 1950 it would mean more deaths as these people would slowly die and the effects of decrease in smoking would only take place after the rest of smokers had died and after that there is a drop correlating to the drop in smoking.

 

[Awesome12]

i found this MCQ file very helpful (must see it)
sorry if it was posted by someone already

Yes I posted it.
Here is the link. There are even more like 90 MCQs now
https://www.xtremepapers.com/commun...biology-c-s-hardest-questions-compiled.32790/

 

[funky brat]

i found this MCQ file very helpful (must see it)
sorry if it was posted by someone already

What is this for?

 

[Awesome12]

i found this MCQ file very helpful (must see it)
sorry if it was posted by someone already

I just uploaded it in the zip file under the title Biology. zip in the first post. It has a size of 6.1 MB. Download that one

 

[***amd***]

Meray maths ko underestimate nahi karna, kitni dafa bataya hai. -.-

35- (B) Gender, Blood Group, Sickle Cell are all discontinous.
47- (B) It's Tt so it's confirmed that there's an allele T and an allele T.
55 - (D) Location of gene is same on chromatids. But genes have alternate forms also called as alleles which may be different or same.
59- (C) From the ER "There are two distinct groups of offspring, such as in the cross of a heterozygous tall strain of pea with a
homozygous short one. The groups are separated by 21cm. Within each group there is continuous variation."
63- (C) Same as above.
64- (B) You cant observe ratios properly in small number of offspring.

can u plz explain what is allele?

 

[Abdul Hanan]

I just uploaded it in the zip file under the title Biology. zip in the first post. It has a size of 6.1 MB. Download that one

IT IS GREAT!!!!!

 

[Awesome12]

can u plz explain what is allele?

Are Bio-masters alright today?

 

[***amd***]

Are Bio-masters alright today?

i m no bio master -.-

 

[Mahnoorfatima]

Somebody answer my questions. Please?

 

[funky brat]

Anyone who's done with his preparation can sit here and answer our queries. :c