Biology; Chemistry; Physics: Post your doubts here!

[Talhakhan]

honestly dude..i am not able to get it :|

Thats why i've also asked for help......

 

[Spidey21]

Thats why i've also asked for help......

LOL


k thanx..

 

[ashiqbal]

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_s03_qp_6.pdf
Help needed with question 3 part c......... Plz give a in depth detail if possible ..... ;-(

most touch receptors are present at the finger tips and as they are closer together, a more accurate result is identified by the brain ie there are two points, not one.
as the distance from finger tips increases, the number of receptors per unit area decrease, and the result identified by the brain is more inaccurate.

 

[Talhakhan]

Can someone tell me how to examine a leaf under microscope to find where chloroplast are found.....
And also the examine of pollen grains ..... It would be very helpful....

 

[ashiqbal]

Can someone tell me how to examine a leaf under microscope to find where chloroplast are found.....

i dunno.... you would have to use some kind of stain or anything, the rest is normal microscope procedure

 

[Talhakhan]

i dunno.... you would have to use some kind of stain or anything, the rest is normal microscope procedure

I want to know the microscope procedure.....

 

[ashiqbal]

I want to know the microscope procedure.....

maybe these will help!

 

[Dukeofwin]

Please answer this question asap! Exam tomorrow!
Its from M/J 2011 Question 2!

 

[Spidey21]

Please answer this question asap! Exam tomorrow!
Its from M/J 2011 Question 2!

had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!!

 

[Talhakhan]

had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!!

But when you measure pollen grain it is 56 mm .......

 

[Spidey21]

But when you measure pollen grain it is 56 mm .......

dude...its the same then
look the pollen grain comes into the scale of 0.05 twice so that makes its length here 0.1 mm
then you divide 56 by 0.1 mm
or just measure the length of the grain on the line and compare like the way i said earlier to get you r answer..

 

[Dukeofwin]

had trouble with this earlier
its easy
you have the scale..then you measure the pollen grain which will be approx 28mm
then you divide 28 by 0.05(scale) and youll get yuor answer!!

Hats off for such a quick response. Thanks alot!

 

[ashiqbal]

But when you measure pollen grain it is 56 mm .......

so then u have to divide 56 by 0.1, as the length of the scale is also doubled!

 

[Spidey21]

Hats off for such a quick response. Thanks alot!

np
and keep your hats on please...i prefer watercoolers...

 

[ashiqbal]

np
and keep your hats on please...i prefer watercoolers...

enough with the water coolers already

 

[Spidey21]

enough with the water coolers already

how about a silai machine then?

 

[Dukeofwin]

dude...its the same then
look the pollen grain comes into the scale of 0.05 twice so that makes its length here 0.1 mm
then you divide 56 by 0.1 mm
or just measure the length of the grain on the line and compare like the way i said earlier to get you r answer..

Two Questions,

1) Answer is 560! what would be prefix or suffix(x560 or 560mm)
2)Magnification has no units right?

 

[Spidey21]

Two Questions,

1) Answer is 560! what would be prefix or suffix(x560 or 560mm)
2)Magnification has no units right?

magnification has no unites : correct

and it would 560x or 560 times but NOT 560mm...i repeat NOT 560mm...

 

[ashiqbal]

magnification has no unites : correct

and it would 560x or 560 times but NOT 560mm...i repeat NOT 560mm...

where is your centre?

 

[Dukeofwin]

Questionn: What is the order of teeths? (Molars, premolars,others i cant remember!)