Biology; Chemistry; Physics: Post your doubts here!

[Spidey21]

ppl thnk lyk u... but they are not always ryt...... but if thz makes u happy go ahead.........

and you think you are always right/?

 

[asd]

"not always" ryte but sometimes yes. *Like a Boss*

 

[asd]

But in case of girls 'no'. LMAO.

 

[Dashing Cancerian]

and you think you are always right/?

i never said that.... did i???

 

[Talhakhan]

Can someone tell me that at todays ATP was the last answer was meosis or mitosis...... Reply soon plz....

 

[Spidey21]

i never said that.... did i???

assumption...

 

[Spidey21]

Can someone tell me that at todays ATP was the last answer was meosis or mitosis...... Reply soon plz....

it was meiosis cuz it was showing Gamete formation
please do not discuss the paper until the 24 hours as its against the rules and regs

 

[asd]

Can someone tell me that at todays ATP was the last answer was meosis or mitosis...... Reply soon plz....

meosis.

 

[Dashing Cancerian]

assumption...

bad at even assuming...tch tch tch...

 

[Spidey21]

bad at even assuming...tch tch tch...

tch tch is better than tsk tsk...

 

[Dashing Cancerian]

oh really ???

tch tch is better than tsk tsk...

 

[Anam Noor]

NEED HELP!!!

http://www.xtremepapers.com/papers/...nal O Level/Biology (5090)/5090_w10_qp_12.pdf
Q1/14/20/and 36
Q. what are the function of nitrifying bacteria, denitrifying bacteria and nitrogen fixing bacteria and where are they found???

 

[Spidey21]

NEED HELP!!!

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_w10_qp_12.pdf
Q1/14/20/and 36
Q. what are the function of nitrifying bacteria, denitrifying bacteria and nitrogen fixing bacteria and where are they found???

1 = A
14= D
20= D
36 = B...

 

[Spidey21]

NEED HELP!!!

http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Biology (5090)/5090_w10_qp_12.pdf
Q1/14/20/and 36
Q. what are the function of nitrifying bacteria, denitrifying bacteria and nitrogen fixing bacteria and where are they found???

now for your question

Nitrifying Bacteria are mostly found in soil and sometimes in water and they Oxidise Nitrites ( NO2) to Nitrates (NO3) in the presence of water
ref http://en.wikipedia.org/wiki/Nitrifying_bacteria

denitrifying bact, play an important role in the Nitrogen Cycle..they reduce the nitrates to Nitrogen and water
ref http://en.wikipedia.org/wiki/Denitrifying_bacteria

Nitrogen Fixing Bact. fix together Nitrogen and Hydrogen to give away Ammonia (NH3)...
ref http://en.wikipedia.org/wiki/Nitrogen_fixation

 

[ashiqbal]

In many questions I've seen they ask for colours of stuff like sodium,copper, mg, etc and even compounds....how do we know the colours

metal oxides are usually white except for
CuO is black.
PbO is yellow.
metals are usually silver, shiny.
transition metals colourful(keep in mind the colour of precipitates of the anion test)

 

[Anam Noor]

1 = A
14= D
20= D
36 = B...

i know that!
but why 1a shouldnt it be c as excess glucose is converted to glycogen when food is transported from 3 to 1 that is hepatic portal vein to hepatic vein
- 14 and 20 D WHY???

 

[Spidey21]

i know that!
but why 1a shouldnt it be c as excess glucose is converted to glycogen when food is transported from 3 to 1 that is hepatic portal vein to hepatic vein
- 14 and 20 D WHY???

in 1 its asking how BLOOD is effected by the LIVER so in 3-1 the blood sugar is not added its rather taken away..
in A the blood is ADDED with sugar...

in 20
(its gonna be long)
1.Amount of O2 increases when Breathing increases so it cant be the first
2.High amount of CO2 is the stimuli for breathing so you know that CO2 is required so this cant be 1st either
3.CO2 will be increased in blood after the muscles start to produce CO2 in a high amount
so the processes order is D-C-B-A!!
Hope it helps...

 

[Spidey21]

oh really ???

yeah pretty much

 

[luckywang]

yar itz like this ke on is NaCO3....while other is NaCl....n v need to differntiatie b/t the two so tht corect labls cld be postd..!!

is lead(II) nitrate an acid or it is a salt? only compound with hydrogen like sulphuric and nitrate only consider as an acid?

 

[luckywang]

Thanks everyone...finally got it....
All solids are silvery except copper which is pink
Iodine- purple
Bromine- brown
Chlorine- green
Copper sulphate- blue
Cobalt chloride- pink
Iron sulphate- blue
Magnesium sulphate- white
(sodium,magnesium,calcium) carbonate- white
Sulphur dioxide, carbon dioxide - colourlesss gases
( sodium,magnesium,calcium) oxide - white solid
Iron oxide- blue-black solid
Copper oxide- black solid

cobalt chloride is blue? since it is test for water present and change to pink? or blue colour is incomplete and after water added then only the reaction is completed and the final colour is pink?