AS (Biology) P1 MCQs Preparation Thread.

[ahmed abdulla]

hi .. i saw many threads relating chem and phy ..paper1 .. but never went throught biology ..

so here is the thread for discussing some questions and doubts ,,,

 

[ahmed abdulla]

i am going to start
isnt semiconservative means half .. shouldnt it be at 50 ie B ...y its C

 

[h4rriet]

i am going to start
isnt semiconservative means half .. shouldnt it be at 50 ie B ...y its C

It was grown for five generations.

 

[ahmed abdulla]

It was grown for five generations.

that doesnt mean it should be there ?
can u specify please ?

 

[h4rriet]

that doesnt mean it should be there ?
can u specify please ?

They're asking for the % of cells containing 15N after 5 generations. After 1 generation it's 1/2%, after 2 generations it's 1/4%, after 3 generations it's 1/8%, after 4 generations it's 1/16% and after 5 generations it's 1/32%.

 

[ahmed abdulla]

They're asking for the % of cells containing 15N after 5 generations. After 1 generation it's 1/2%, after 2 generations it's 1/4%, after 3 generations it's 1/8%, after 4 generations it's 1/16% and after 5 generations it's 1/32%.

thanks ... can u help me with microscope questions? i will REALLY appreciate it
i think tomorrow our tesst will be to use eyepiece and stage micrometer ... posted question+ how do we find no of eyepiece unit in REALITY

 

[h4rriet]

thanks ... can u help me with microscope questions? i will REALLY appreciate it
i think tomorrow our tesst will be to use eyepiece and stage micrometer ... posted question+ how do we find no of eyepiece unit in REALITY

Sure, no problem. I've done this one before:

42 EPGU - 10 SMU
1 EPGU - x SMU
42x - 10
x - 10/42 = 0.238 SMU

1 SMU - 0.01 mm
0.238 SMU - x mm
x - 0.01 x 0.238 = 0.00238 mm

Therefore, step 1: 10 divided by 42 = 0.238 x 0.01 = 0.00238 mm.

Step 2: 0.00238 multiplied by 1000 = 2.38 micrometres.

 

[ahmed abdulla]

Sure, no problem. I've done this one before:

42 EPGU - 10 SMU
1 EPGU - x SMU
42x - 10
x - 10/42 = 0.238 SMU

1 SMU - 0.01 mm
0.238 SMU - x mm
x - 0.01 x 0.238 = 0.00238 mm

Therefore, step 1: 10 divided by 42 = 0.238 x 0.01 = 0.00238 mm.

Step 2: 0.00238 multiplied by 1000 = 2.38 micrometres.

i am gettin confused ... my teacher taugh me a different way !
are u sure brro of this?

 

[h4rriet]

i am gettin confused ... my teacher taugh me a different way !
are u sure brro of this?

Yup, 100%. What'd your teacher tell you that's different?

 

[ahmed abdulla]

Yup, 100%. What'd your teacher tell you that's different?

sorry if i am disturbin u ....
that ALL the ten units are 0.01 and not each one ...
we were doin this year (attacched)
are these two questions the same ....

 

[h4rriet]

sorry if i am disturbin u ....
that ALL the ten units are 0.01 and not each one ...
we were doin this year (attacched)
are these two questions the same ....

I'm not being disturbed, it's OK.
And yeah, the questions are the same. It says that the length of one division is 0.01 mm, not 10 divisions.

 

[ahmed abdulla]

I'm not being disturbed, it's OK.
And yeah, the questions are the same. It says that the length of one division is 0.01 mm, not 10 divisions.

last doubt bro
on eyepiece unit there are 10 divisions right ? if we got the matching at 9.. do we say its 9 or 90 ? when caliperating

 

[h4rriet]

last doubt bro
on eyepiece unit there are 10 divisions right ? if we got the matching at 9.. do we say its 9 or 90 ? when caliperating

9 long divisions = 90. 9 small divisions = 9.
Like this:

 

[ahmed abdulla]

9 long divisions = 90. 9 small divisions = 9.
Like this:

i have gone througt it when i found u didnt reply
anyway thanks

 

[ahmed abdulla]

is there any body to help in plan diaram

 

[hela]

CAN ANYONE EXPLAIN

]http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_12.pdf Q13 Q15

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_13.pdf Q39 D

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_1.pdf Q9 D Q26 D
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_qp_1.pdf Q24 B Q31 D

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf Q40 D Q1 A

 

[KWIKIW]

Do you know how to do qs 31 in 01/ oct/nov 2008 ?

 

[KWIKIW]

CAN ANYONE EXPLAIN

]http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w09_qp_12.pdf Q13 Q15

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_13.pdf Q39 D

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_s09_qp_1.pdf Q9 D Q26 D
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w08_qp_1.pdf Q24 B Q31 D

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Biology (9700)/9700_w12_qp_12.pdf Q40 D Q1 A

http://papers.xtremepapers.com/CIE/...and AS Level/Biology (9700)/9700_w08_qp_1.pdf
Qs 24,

large numbers of mitochondria is not an adaptation for water uptake,
as large numbers of mitochondria helps a lot for active transport ,but not for osmosis.
But water taken in by osmosis , so ans is b.​

 

[Bluejeans#]

Yup, 100%. What'd your teacher tell you that's different?

P1 May/june 12 varient.....
Q: 37, 36, 31, 23, 17, 14, 7, 5 ,4.

 

[h4rriet]

P1 May/june 12 varient.....
Q: 37, 36, 31, 23, 17, 14, 7, 5 ,4.

Variant 12, I presume:
37. Cholera is spread via contaminated food and water.
36. Not TB, so not D; not cholera, so not A & B; so C.
31. C; it's a fact.
23. B; fact too.
17. Chromosomes uncoil last of all; that's D.
14. D; fact.
7. B; fact.
5. Use image size = actual size x magnification.
4. D. FACT.