BIO HELP......

[hassam]

http://www.xtremepapers.net/CIE/Interna ... _qp_31.pdf
CHEK b PART of Q1....he says modify the method u used in A.....in what way i cn modify the method........any valid suggestion?

 

[hassam]

help....i need practical details of how to mantain ph constant during an experiment.......

 

[XPFMember]

http://www.xtremepapers.net/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_s07_qp_31.pdf
CHEK b PART of Q1....he says modify the method u used in A.....in what way i cn modify the method........any valid suggestion?

Assalaoalaikum!!!!!!

Well...u'll be using 2cm3 of lead nitrate soln. instead of distilled water :!:

Repeat the experiment with diff. concentrations

 

[hassam]

hmm..that sounds good.......bt wat about how to test....i mean we ll again wait 5 min for each lead conc.

 

[XPFMember]

actually i dont remember exactly...its been a long time i did that exp. ... i think..we'll note down the time taken to digest starch completely...i mean every 30 seconds we'll test the soln. and then determine the total time needed for starch to digest!

correct me if i'm wrong cuz i didnt read the question again telling just what i remember

 

[hassam]

are you performing practicals in school lab or just solving them to get familiar?

 

[hassam]

describe the role of endodermis in roots?


cn anybody explain me wat i hav to write for last two points given in markscheme

 

[XPFMember]

Assalamoalaikum!!

are you performing practicals in school lab or just solving them to get familiar?

Yes we are doing the practicals in school

 

[hassam]

plxx....somebody tell me abt endodermis.......last two points
and can a prokaryote be multicellular :?:

 

[rz123]

endodermis is the layer of tissue deep in vascular plants.

It is the inner most layers of the cortex,with no intercellular spaces.There are thickenings of special materials around cell which check diffusion of water from xylem to cortex.

 

[hassam]

bt i m asking for how it plays a role in generation of root pressure

 

[rz123]

whats the difference between chromatin, chromatid and chromosome?

 

[princesszahra]

http://www.xtremepapers.net/CIE/International%20A%20And%20AS%20Level/9700%20-%20Biology/9700_s07_qp_31.pdf
CHEK b PART of Q1....he says modify the method u used in A.....in what way i cn modify the method........any valid suggestion?

Assalaoalaikum!!!!!!

Well...u'll be using 2cm3 of lead nitrate soln. instead of distilled water :!:

Repeat the experiment with diff. concentrations

exactly what i wanted to say!