Biology; Chemistry; Physics: Post your doubts here!

[papajohn]

which mole formula? i do it with ratio's, can you tell me the formula?

No of moles= Mass in gram/Ar or Mr

 

[starship]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s11_qp_61.pdf
Q1 B part, can someone tell me the name of any plant tissue and also what is external blotting of a tissure? plis reply asap

 

[starship]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s11_qp_61.pdf
Q1 B part, can someone tell me the name of any plant tissue and also what is external blotting of a tissure? plis reply asap

And are potato tubers correct for this example?

 

[ijlalm]

What are the physical appearances of different chemical compounds??....(frequently asked in Chemistry ATP)

 

[starship]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_w10_qp_62.pdf
Q3ai) why is test tube C alkaline

CO2 used up in photosynthesis. so there is less co2 present in the tube now.

 

[starship]

What are the physical appearances of different chemical compounds??....(frequently asked in Chemistry ATP)

Which compound?

 

[ijlalm]

there are countless compounds, the paper can ask any of them!!
BTW what is the colour of silver bromide and silver iodide??..ive heard that AgBr is a pale yellow ppt and AgI is a yellow ppt.. is it true?

 

[starship]

there are countless compounds, the paper can ask any of them!!
BTW what is the colour of silver bromide and silver iodide??..ive heard that AgBr is a pale yellow ppt and AgI is a yellow ppt.. is it true?

AgCl = white
AgBr = cream coloured
AgI = yellow

 

[asma tareen]

CO2 used up in photosynthesis. so there is less co2 present in the tube now.

thnx

 

[m7aug]

plz can any body tell me how to plot a graph in atp if values are not starting from zero especially in chemistry and biology..should we join the point (0,0) by our own to the first point of the give talble e.g (10,20) need help immediately

 

[m7aug]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Biology (5090)/5090_s11_qp_61.pdf
Q1 B part, can someone tell me the name of any plant tissue and also what is external blotting of a tissure? plis reply asap

i think pieces of radish or carrot can be suitable alternatives of potato for this experiment.

 

[asma tareen]

i think pieces of radish or carrot can be suitable alternatives of potato for this experiment.

i dont get it they are saying plant tissues and u're naming vegetables sorry if this question is irrelevant

 

[m7aug]

i dont get it they are saying plant tissues and u're naming vegetables sorry if this question is irrelevant

they r asking any tissue for this experiment which substitute potato which it self is a tuber(vegetative part) plz share with us if u have a better ans.

 

[asma tareen]

they r asking any tissue for this experiment which substitute potato which it self is a tuber(vegetative part)

oh ok thnx got it

 

[asma tareen]

they r asking any tissue for this experiment which substitute potato which it self is a tuber(vegetative part) plz share with us if u have a better ans.

btw can u tell me how are we gonna design an experiment

 

[starship]

i dont get it they are saying plant tissues and u're naming vegetables sorry if this question is irrelevant

they r asking any tissue for this experiment which substitute potato which it self is a tuber(vegetative part) plz share with us if u have a better ans.

Onion epidermis?

 

[m7aug]

oh ok thnx got it

can u plz tell me how plot a graph in bio atp when the given values are not starting from origion of 0 one axis should we make a ruled line joing point (0,0) to the first point given in the table

 

[asma tareen]

can u plz tell me how plot a graph in bio atp when the given values are not starting from origion of 0 one axis should we make a ruled line joing point (0,0) to the first point given in the table

well its not necessary fr the line to pass from the origin u can simply start the line from the first given co ordinates and if it wants the value of something then u can extend it in the pattern of the line....actually m not really good at explaining

 

[AhsanAfzal]

in bio atp how do we measure size of diagrams. do we have to measure from the longest side?

 

[m7aug]

btw can u tell me how are we gonna design an experiment

make three experiments with different concentration of solution .start with equal mass of sample tissue and volume of sucrose solution left these test tube for equal interval of time. then check changes in length. take the concetration which produced least change in length and repeat experiment with small changes on either side of the value for concentration recorded in first attempt note the results again and take average of best values of concentraion