POST YOUR BIO AND CHEM PAPER 1 DOUBT HERE !!!!

[GorgeousEyes]

i love your picture of Cyrine btw

thanks again

 

[L-Girl]

ssrry it's B for the same reason

thanks a lot

 

[GorgeousEyes]

Nov03 no.32 please , Why B ? Why not C ?

 

[Ahmed Khider]

Nov03 no.32 please , Why B ? Why not C ?

Which subject bio or chemistry???

 

[Ahmed Khider]

Well i assume its chemistry. As u know for rusting iron needs only the O2 from the air and oxygen is only 20% of air so the water level will rise a bit. If for example nitrogen was needed for rusting then the answer would have been C becoz nitrogen is 79% of air..hope u understood

 

[GorgeousEyes]

Yes, I understood it. thanks

 

[GorgeousEyes]

chemistry , Jun06 , no.6 .

 

[Ahmed Khider]

chemistry , Jun06 , no.6 .

The answer is B becoz in CH4 each hydrogen atom uses its 1 electron in bonding(covalent) and the carbon atom uses its 4 outermost electrons for bonding with the 4 hydrogen atoms.

 

[GorgeousEyes]

Get it , Merci

 

[Lost_Life]

NEED OF ASSISTANCE!
IN MAY JUNE 2011, VARIANT 11,
QUESTION (26)
WHY IS THE ANSWER NOT B?? I MEAN ITS THE ONLY ONE THAT SHOWS A POLLEN....

 

[Maz]

NEED OF ASSISTANCE!
IN MAY JUNE 2011, VARIANT 11,
QUESTION (26)
WHY IS THE ANSWER NOT B?? I MEAN ITS THE ONLY ONE THAT SHOWS A POLLEN....

All of them are showing the movement of pollen.It cannot be B since the pollen does not enter the style directly without passing through the stigma first. You have to remember that the pod was earlier the female organs of the plant.

 

[Lost_Life]

Hello, i have a question..
October /November 2004 variant 2
number 40
I don't get why its A not C, Since the plant absorbs most of the insecticide.. It should have a HIGH concentration
Then, once the consumer eats the plant it should DECREASE NOT INCREASE
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Hello, i have a question..
October /November 2004 variant 2
number 40
I don't get why its A not C, Since the plant absorbs most of the insecticide.. It should have a HIGH concentration
Then, once the consumer eats the plant it should DECREASE NOT INCREASE
HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Assalam-o-alaikum wr wb...
always remember that in a food chain..whenever an insectide, pesticide or ANY poisonous thing is sprayed...it will be MOST concentrated in the last consumer!
same is the case here

 

[Lost_Life]

Assalam-o-alaikum wr wb...
always remember that in a food chain..whenever an insectide, pesticide or ANY poisonous thing is sprayed...it will be MOST concentrated in the last consumer!
same is the case here

Walaikoum essalam!
:O i see ! i think i mixed my understanding of Energy flow with Concentration of pesticide :O
X} thank you!!!!!!!

 

[saroooor]

Biology Questions :
November 2009 # 18 Why isn't it A ?
June 11 # 26 why isn't it A ?in the place where the anthers are located so do the stigma ?!! or do they mean D because the place where it is picked from ?

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Walaikoum essalam!
:O i see ! i think i mixed my understanding of Energy flow with Concentration of pesticide :O
X} thank you!!!!!!!

it's okie
juss remember me in your prayers

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Biology Questions :
November 2009 # 18 Why isn't it A ?

Assalam-o-alaikum wr wb..
it IS A

 

[сᴏᴏʟ сяуѕтᴀʟѕ]

Biology Questions :
June 11 # 26 why isn't it A ?in the place where the anthers are located so do the stigma ?!! or do they mean D because the place where it is picked from ?

which variant? none of them has anther or stigma in Q26

 

[Lost_Life]

it's okie
juss remember me in your prayers

yes i will 0:}

 

[saroooor]

Chemistry Questions :
november 05 # 39 I do know that because there is no double bond so it is an alkane which will not decolourise the bromine , but if you count the number of carbon atoms and hydrogen atoms it will give you C6H12 Which is matching the General formula alkene CnH2n . So it could be B . ??!
June 06 # 19 three of them will produce Cu ions . I do understand that for Cu + H2so4 ->CuSo4(copper Cu2+ ion present ) + H2 . and for CuCo3+H2so4-> CuSo4 (Cu2+ ions present ) +H20 + c02 .What about Cu(OH)2 + H2so4???Why there is no copper ions .
November 06 # 5 did not get it .
November 08# 20 why does the ph fall because BaNo3 + HCL-> Bacl + Hno3 ( Which one is acidic to decrease the pH 'from the products' ??!!!)