A level Biology: Post your doubts here!

[farhan143]

so today i was practising to focus on microscopic slides
I TOOK THESE PICTURES WITH MY MOBILE PHONE.......
CLEAR ENOUGH TO IDENTIFY AND LABEL!

i found 1 slide written Oct/Nov 2007 J1:

Low power:


High power:




Can any1 tell me what cell this and label the parts for me

thank you!!!

 

[Casablanca]

so today i was practising to focus on microscopic slides
I TOOK THESE PICTURES WITH MY MOBILE PHONE.......
CLEAR ENOUGH TO IDENTIFY AND LABEL!

i found 1 slide written Oct/Nov 2007 J1:

Low power:
View attachment 8543

High power:

View attachment 8544


Can any1 tell me what cell this and label the parts for me

thank you!!!

This looks to me like chlorenchyma tissue. Google several different images and compare yourself for confirmation. The white in the center is phloem, and the red surrounding is xylem. I THINK. I'm not 100% sure. So check in the marking scheme of this past paper just in case.

Edit: It's a dicot leaf, I think...

 

[sagystu]

what is the diff. bet di cot . leaf and mono under microscope ?!

 

[Idolfanatic95]

so today i was practising to focus on microscopic slides
I TOOK THESE PICTURES WITH MY MOBILE PHONE.......
CLEAR ENOUGH TO IDENTIFY AND LABEL!

i found 1 slide written Oct/Nov 2007 J1:

Low power:
View attachment 8543

High power:

View attachment 8544


Can any1 tell me what cell this and label the parts for me

thank you!!!

It's probably a dicot stem.

 

[Casablanca]

Could someone please link me to pictures of some of the more common slides we're going to need to identify? Thanks in advance.

 

[confused123]

Trachea might look funny but that's all i cud see :O

Thanks Buddy!

 

[confused123]

which magnification to use in the microscope 10X, 40X, when to use which one while watching slides?

 

[farhan143]

Help!!! Help !!!

can any1 tell me what all plan diagrams are we supposed to know!!!
which all microscopic images of cell are we supposed to know!!
and what all labeling shud we kno!!!

Help Help!!!!!!!

 

[confused123]

Help!!! Help !!!

can any1 tell me what all plan diagrams are we supposed to know!!!
which all microscopic images of cell are we supposed to know!!
and what all labeling shud we kno!!!

Help Help!!!!!!!

see the last 20 pages of this thread, there are plan diagrams and you might find so0me tips..

 

[geek101]

http://www.xtremepapers.com/papers/...nd AS Level/Biology (9700)/9700_w08_ms_31.pdf can someone pleeeease explain what they want in the table! this mark scheme is confusing aloot! thnx in advance!

 

[geek101]

http://www.xtremepapers.com/papers/...and AS Level/Biology (9700)/9700_s06_qp_3.pdf someone pleeeeeeeeease do 2 ii ! thank youu and good luck!

 

[Idolfanatic95]

which magnification to use in the microscope 10X, 40X, when to use which one while watching slides?

For low power generally x4 is used. For. High power use x40 but if it's too blurr using it, better shift to x10.

 

[Hussnain]

http://www.xtremepapers.com/papers/...nd AS Level/Biology (9700)/9700_s07_qp_32.pdf
2(iii)
please answer quickly.and good luck

 

[KurayamiKimmi]

Can anyone explain two-fold serial dilutions to me? please ^_^
i understand ten fold but dont get two-fold
an example of the two-fold dilutions would be highly appreciated ^_^

 

[geek101]

when recording time, to ow many decimal places should we write it too....does it have to be a whole number!

 

[Casablanca]

when recording time, to ow many decimal places should we write it too....does it have to be a whole number!

Depends on the least count of the measuring device. It doesn't have to be a whole number, could be 2.12 or 4.3 or whatever.

Edit: But try to round it, because that's what I heard.

 

[geek101]

can someone pleaseee kindly post a list of errors for food tests! ''extremeeeeely'' appreciated!

 

[KurayamiKimmi]

when recording time, to ow many decimal places should we write it too....does it have to be a whole number!

its safer to keep your time readings to 3 s.f

 

[PhoenixAsh12]

Hey, does anyone know which years are the most important to study for practical 32, I can't study everything because I also have a maths exam.
Thanks!

 

[geek101]

Hey, does anyone know which years are the most important to study for practical 32, I can't study everything because I also have a maths exam.
Thanks!

dunno about that, but you can go the first page of this thread, a member gave really good tips! im sure they'll help, follow instructions carefully, good luck!