Biology; Chemistry; Physics: Post your doubts here!

[Lilly2318]

can someone tell that in moles question of atp. can wee leave the anser as 5x10^-3 or hav to write it like 0.005 ?

 

[FLRNAB]

can someone tell that in moles question of atp. can wee leave the anser as 5x10^-3 or hav to write it like 0.005 ?

You can leave it like that.

 

[princess Anu]

Copper is less reactive than Hydrogen
It all depends on the Reactivity Series. The more reactive metal displaces the less reactive metal
E.g: Sodium + Calcium Hydroxide = Sodium Hydroxide + Calcium

Well the answer is A

 

[Qasim Hafeez]

Hey friends,
Today I had my physics exams at my school. The subject was really easy and I got a straight 'A' in the first term with only 2/3 marks short of a 'A*'
I find the subject easy, and did score good marks at test, but today everything seemed so difficult. I studied late night, and checked everything from past papers but in my exam papers the questions were so twisted I didnot know what to do.

Please any suggest how to improve.

 

[Awesome12]

How to prepare for Chemistry? :/

I thought you wre a Chem master

 

[Muhammad_Hamza]

please help me in this part?
For 3 marks.

koi solution to bta do koi?

 

[princess Anu]

Copper(II) chloride can be prepared in this way :
Take 10cm3 of 0.100 mol/dm3 hydrochloric acid and add 10g of copper Oxide (in excess) in to a beaker to ensure all acid has been neutralised. Filter the given solution to collect excess of metal as residue. Take the solution in a evaporating dish and Heat it over steam bath until its saturation point. Leave the resulting solution to cool. Filter the solution to obtain crystals. Wash them with hexane and dry them between folds of filter paper.

 

[princess Anu]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s07_qp_1.pdf
In Q29 how do we know if they are asking largest in terms of number or size? :S what indicates that?

 

[exploded diper]

it says

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s07_qp_1.pdf
In Q29 how do we know if they are asking largest in terms of number or size? :S what indicates that?

d
becus its says individual largest..there can me...meaning which one is largest....

 

[peacce]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s07_qp_1.pdf
In Q29 how do we know if they are asking largest in terms of number or size? :S what indicates that?

Is the answer A?

 

[exploded diper]

no...its d...as many c's are eating a few d...while nothing is eathing a...and it is also eating the things which are more thn it......

 

[exploded diper]

The pyramid is of numbers
. Since there are not many Ds, whic
h are the producers, they must be
big, as they provide the food for the large
number of Cs, which must be small individuals
thts what the er say

 

[princess Anu]

Answer is D.
But explain me how do we know if they are asking for individual largest in number or in size?

 

[princess Anu]

Isn't it that the organisms on last trophic level are always largest :/

 

[princess Anu]

What is the part played by cell membrane in turgor?

 

[exploded diper]

Answer is D.
But explain me how do we know if they are asking for individual largest in number or in size?

look it said which of the INDIVIUALS are largest so it means in size

 

[peacce]

What is the part played by cell membrane in turgor?

it prevents it from bursting by provide with an opposing pressure

 

[princess Anu]

it prevents it from bursting by provide with an opposing pressure

But thats the role of cell wall not cell membrane

 

[princess Anu]

look it said which of the INDIVIUALS are largest so it means in size

what if they were asking in numbers ? how would the sentence be like then?

 

[princess Anu]

What are the Effects of Abuse of Alcohol and Heroine?